CN110449309B - Fluid oscillator array and frequency synchronization method thereof - Google Patents
Fluid oscillator array and frequency synchronization method thereof Download PDFInfo
- Publication number
- CN110449309B CN110449309B CN201910758278.8A CN201910758278A CN110449309B CN 110449309 B CN110449309 B CN 110449309B CN 201910758278 A CN201910758278 A CN 201910758278A CN 110449309 B CN110449309 B CN 110449309B
- Authority
- CN
- China
- Prior art keywords
- feedback
- outlet
- fluidic oscillator
- channel
- nth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
Abstract
A fluidic oscillator array and a frequency synchronization method thereof comprise the 1 st to the Nth fluidic oscillators, wherein N is more than or equal to 2; a feedback outlet of the nth fluidic oscillator is communicated with a feedback return port of the (n + 1) th fluidic oscillator to form a feedback channel; the method can synchronize the oscillation frequency of all the fluid oscillators in the array containing two or more fluid oscillators, and the adjacent oscillators have fixed phase difference during working, even if the oscillation frequency of each fluid oscillator during independent working is different, the synchronization control is carried out by the synchronization method disclosed by the invention, so that the oscillators can be applied to large-scale flow separation control, such as flow separation in an air inlet passage of an aircraft engine, in a centrifugal or axial flow compressor, in a high/low pressure compressor transition section, in a high/low pressure turbine transition section, at an aircraft flap and at an empennage, and the control efficiency of the flow separation is effectively improved, thereby achieving the purposes of improving the working efficiency of an engine and widening the flight envelope of the aircraft.
Description
Technical Field
The present disclosure relates to oscillator arrays, and more particularly, to a fluidic oscillator array and a frequency synchronization method thereof.
Background
The active flow control is to directly inject a proper disturbance mode in a flow environment to be coupled with the internal mode of the system, so that high control benefit is obtained with low energy consumption, and the control effect of 'four-two-dial jack' is achieved. Compared with a traditional passive control method or a steady-state blowing and sucking method, the active flow control method based on periodic unsteady-state excitation is higher in efficiency. These periodic unsteady perturbations can be generated by various actuators. Compared with other types of exciters, the fluidic oscillator does not have any moving parts and can generate oscillating jet flow at the outlet under a certain steady-state inlet fluid pressure. Its reliability and robustness have natural advantages since its oscillatory flow is completely self-exciting and self-sustaining, relying entirely on the fluid properties within itself. And the working frequency range is wide, from dozens of hertz to tens of thousands of hertz; the jet velocity can be varied from subsonic to supersonic.
The operation of fluidic oscillators is entirely self-exciting and self-sustaining, and if each works alone, their output jets will oscillate independently and each produce a relatively random flow. Even if the oscillators are designed with the same dimensions, the operating characteristics are very sensitive to the geometry of the internal flow channels, and the slight differences in machining and assembly result in significant differences in their oscillation frequencies and jet velocity profiles.
Disclosure of Invention
In order to solve the technical problem, the present disclosure provides a fluidic oscillator array and a frequency synchronization method thereof, and the specific implementation manner is as follows:
the first preferred solution of the fluidic oscillator array of the present disclosure:
an array of fluidic oscillators, the fluidic oscillators comprising: an inlet, a first sidewall channel, a second sidewall channel, a first outlet, a second outlet;
the inlet is communicated with the first outlet through a first side wall channel; the inlet is communicated with the second outlet through a second side wall channel;
the first side wall channel is provided with a first feedback outlet close to the first outlet; the second side wall channel is provided with a second feedback outlet close to the second outlet; the inlet is communicated with a first feedback return port and a second feedback return port;
the fluid oscillator array comprises 1 st to Nth fluid oscillators, wherein N is more than or equal to 2;
a first feedback outlet of the nth fluidic oscillator is communicated with a first feedback port of the (n + 1) th fluidic oscillator to form a first feedback channel; a second feedback outlet of the nth fluidic oscillator is communicated with a second feedback port of the (n + 1) th fluidic oscillator to form a second feedback channel; n is less than N;
a first feedback port of the 1 st fluidic oscillator is communicated with a second feedback outlet of the Nth fluidic oscillator to form a third feedback channel; and the second feedback port of the 1 st fluidic oscillator is communicated with the first feedback outlet of the Nth fluidic oscillator to form a fourth feedback channel.
Further, the lengths of all the first feedback channels, all the second feedback channels, all the third feedback channels and all the fourth feedback channels are the same, and the sectional areas of all the first feedback channels, all the second feedback channels, all the third feedback channels and all the fourth feedback channels are the same.
Still further, the first feedback outlet of the nth fluidic oscillator and the first feedback port of the (n + 1) th fluidic oscillator are movably or fixedly connected through a channel, and/or
The second feedback outlet of the nth fluid oscillator and the second feedback port of the (n + 1) th fluid oscillator are movably or fixedly connected through a channel, and/or
The first feedback port of the 1 st fluidic oscillator is movably or fixedly connected with the second feedback outlet of the Nth fluidic oscillator through a channel, and/or
The second feedback port of the 1 st fluidic oscillator is movably or fixedly connected with the first feedback outlet of the Nth fluidic oscillator through a channel.
Second preferred aspect of the fluidic oscillator array of the present disclosure:
an array of fluidic oscillators, the fluidic oscillators comprising: an inlet, a first sidewall channel, a second sidewall channel, a first outlet, a second outlet;
the inlet is communicated with the first outlet through a first side wall channel; the inlet is communicated with the second outlet through a second side wall channel;
the first side wall channel is provided with a first feedback outlet close to the first outlet; the second side wall channel is provided with a second feedback outlet close to the second outlet; the inlet is communicated with a first feedback return port and a second feedback return port;
the fluid oscillator array comprises 1 st to Nth fluid oscillators, wherein N is more than or equal to 2;
a second feedback outlet of the nth fluidic oscillator is communicated with a first feedback back port of the (n + 1) th fluidic oscillator to form a first feedback channel; a second feedback port of the nth fluidic oscillator is communicated with a first feedback outlet of the (n + 1) th fluidic oscillator to form a second feedback channel; n is less than N;
the first feedback outlet of the 1 st fluidic oscillator is communicated with the first feedback return port of the 1 st fluidic oscillator to form a third feedback channel; and the second feedback outlet of the Nth fluidic oscillator is communicated with the second feedback port of the Nth fluidic oscillator to form a fourth feedback channel.
Further, inlets of all the fluidic oscillators are in the same direction, and the first feedback channel and the second feedback channel are crossed. In a three-dimensional space, the first feedback channel and the second feedback channel are not on one plane, and there is no intersection point, so the "intersection" in the present disclosure is a feature that the first feedback channel and the second feedback channel are embodied as "intersection" on a two-dimensional projection plane;
further, the inlet of the nth fluidic oscillator and the inlet of the (n + 1) th fluidic oscillator face opposite directions; the first feedback path and the second feedback path have no intersection.
Further, the nth fluidic oscillator and the (n + 1) th fluidic oscillator are arranged in a staggered manner, and the first inlet and the second inlet of all the fluidic oscillators are located on the same control line.
Further, the lengths of all the first feedback channels, all the second feedback channels, all the third feedback channels and all the fourth feedback channels are the same, and the sectional areas of all the first feedback channels, all the second feedback channels, all the third feedback channels and all the fourth feedback channels are the same.
Further, the second feedback outlet of the nth fluidic oscillator and the first feedback return port of the (n + 1) th fluidic oscillator are movably or fixedly connected through a channel, and/or
The second feedback port of the nth fluidic oscillator is movably or fixedly connected with the first feedback outlet of the (n + 1) th fluidic oscillator through a channel, and/or
The first feedback outlet of the 1 st fluidic oscillator is communicated with the first feedback return port of the 1 st fluidic oscillator and is movably or fixedly connected through a channel, and/or
And the second feedback outlet of the Nth fluidic oscillator is movably or fixedly connected with the second feedback port of the Nth fluidic oscillator through a channel.
The first preferred scheme of the frequency synchronization method of the fluidic oscillator array of the present disclosure is as follows:
a frequency synchronization method of a fluidic oscillator array is characterized in that a corresponding number of fluidic oscillators are selected to form the fluidic oscillator array of the first preferred scheme of the fluidic oscillator array according to the flow separation range required to be controlled;
emitting a main jet flow from inlets of the N fluidic oscillators into all the fluidic oscillators simultaneously;
when the main jet is emitted from the first side wall channel or the second side wall channel of the nth fluidic oscillator through the first outlet or the second outlet, part of the jet is enabled to flow through the first feedback channel or the second feedback channel of the nth fluidic oscillator through the first feedback outlet or the second feedback outlet of the nth fluidic oscillator to flow to the first feedback port or the second feedback port of the (n + 1) th fluidic oscillator; at the moment, the pressure of the first feedback port or the second feedback port of the (n + 1) th fluidic oscillator is increased, and the main jet is forced to be emitted from the second outlet or the first outlet through the second side wall channel or the first side wall channel of the main jet;
when the main jet is emitted from the first outlet or the second outlet from the first side wall channel or the second side wall channel of the nth fluidic oscillator, part of the jet is caused to flow through the fourth feedback channel flow or the third feedback channel via the first feedback outlet or the second feedback outlet of the nth fluidic oscillator to be emitted to the second feedback port or the first feedback port of the 1 st fluidic oscillator, and at the moment, the pressure of the second feedback port or the first feedback port in the 1 st fluidic oscillator is increased, so that the main jet in the 1 st fluidic oscillator is forced to flow through the first side wall channel or the second side wall channel to be emitted from the first outlet or the second outlet;
the primary jet alternately exits from the first outlet or the second outlet of each fluidic oscillator; each fluidic oscillator is frequency synchronized.
Further, the inlet pressure is adjusted according to the desired array synchronization frequency and/or according to the oscillating velocity profile of the outlet jet.
As another embodiment of the synchronization method of the present disclosure:
according to the frequency synchronization method of the fluid oscillator array, a corresponding number of fluid oscillators are selected to form the fluid oscillator array of the second preferred scheme of the fluid oscillator array according to the flow separation range required to be controlled;
emitting a main jet flow from inlets of the N fluidic oscillators into all the fluidic oscillators simultaneously;
when the main jet flow is emitted from the nth fluidic oscillator from the first outlet through the first side wall channel, part of the jet flow flows through the first feedback channel via the first feedback outlet of the nth fluidic oscillator to the second feedback outlet of the (n-1) th fluidic oscillator to be emitted due to the restriction of the resistance of the first outlet; at the moment, the pressure of the second feedback port of the (n-1) th fluidic oscillator is increased, and the main jet is forced to be emitted from the first outlet through the first side wall channel of the main jet;
when the main jet is emitted from the second outlet through the second side wall channel of the nth fluidic oscillator, part of the jet flows through the second feedback channel via the second feedback outlet of the nth fluidic oscillator to the first feedback outlet of the (n + 1) th fluidic oscillator to be emitted due to the resistance limitation of the second outlet; at the moment, the pressure of the first feedback port of the (n + 1) th fluidic oscillator is increased, and the main jet is forced to be emitted from the second outlet through the second side wall channel of the main jet;
when the main jet flows through the first side wall channel of the 1 st fluidic oscillator and is emitted from the first outlet of the fluidic oscillator, part of the main jet flows through the third feedback channel and is emitted from the first feedback port of the fluidic oscillator due to the restriction of the resistance of the first outlet, and the pressure of the first feedback port of the 1 st fluidic oscillator is increased at the moment, so that the main jet is forced to be emitted from the second outlet through the second side wall channel of the main jet;
when the main jet flows through the second side wall channel of the Nth fluidic oscillator and is emitted from the second outlet of the Nth fluidic oscillator, the resistance of the second outlet of the main jet is limited, so that part of the jet flows through the fourth feedback channel and is emitted from the second feedback port of the Nth fluidic oscillator, and the pressure of the second feedback port of the Nth fluidic oscillator is increased at the moment, so that the main jet is forced to be emitted from the first outlet through the first side wall channel of the main jet;
the primary jet alternately exits from the first outlet or the second outlet of each fluidic oscillator; each fluidic oscillator is frequency synchronized.
Further, the inlet pressure is adjusted according to the desired array synchronization frequency and/or according to the oscillating velocity profile of the outlet jet.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
Fig. 1 is a schematic view of an internal flow passage structure of a fluidic oscillator of the present disclosure;
FIG. 2 is a schematic diagram of an array structure applied to two fluidic oscillators according to an embodiment;
FIG. 3 is a schematic diagram of an array structure applied to four fluidic oscillators according to an embodiment;
FIG. 4 is a schematic diagram of an array structure applied to two fluidic oscillators in the third embodiment;
FIG. 5 is a schematic diagram of an array structure applied to four fluidic oscillators in the third embodiment;
FIG. 6 is a schematic diagram of an array structure applied to four fluidic oscillators in the fourth embodiment;
FIG. 7 is a schematic diagram of an array structure of the fifth embodiment applied to four fluidic oscillators;
the first feedback channel comprises an inlet 1, a first side wall channel 21, a second side wall channel 22, a first outlet 31, a second outlet 32, a first feedback outlet 41, a second feedback outlet 42, a first feedback return 51, a second feedback return 52, a first feedback channel 61, a second feedback channel 62, a third feedback channel 63 and a fourth feedback channel 64.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
An array of fluidic oscillators, the fluidic oscillators comprising: an inlet 1, a first sidewall passage 21, a second sidewall passage 22, a first outlet 31, a second outlet 32; the inlet 1 communicates with the first outlet 31 through the first sidewall passage 32; the inlet 1 communicates with the second outlet 32 through the second sidewall passage 22; the first sidewall passage 21 is provided with a first feedback outlet 41 adjacent to the first outlet 31; the second sidewall passage 32 has a second feedback outlet 42 adjacent the second outlet 32; the inlet 1 is communicated with a first feedback port 51 and a second feedback port 52.
In this embodiment, the operation of the fluidic oscillator described above is based on the coanda effect, and the jet will adhere to one of the first sidewall channel and the second sidewall channel after entering the fluidic oscillator from the inlet, depending on the initial conditions of the jet or as a result of a particular action on the main jet. If no feedback channel is provided and the first and second outlets are large, the jet to the first or second sidewall channel will flow steadily and exit from the first or second outlet. With a feedback channel, when the main jet is attached to the first side wall channel, due to the resistance restriction of the corresponding first outlet, a part of the fluid will enter the feedback channel and cause an increase in the pressure of the oscillator first side wall channel, which increase, in addition to the lateral disturbance of the main jet, causes the jet to switch to the second side wall channel, after the main jet direction switch, the same phenomenon occurs in the second side wall channel of the oscillator and causes a self-sustaining oscillating behavior, with the pulses alternately leaving the first outlet and the second outlet.
The fluidic oscillator array of the embodiment comprises 1 st to Nth fluidic oscillators, wherein N is more than or equal to 2;
the first feedback outlet 41 of the nth fluidic oscillator is communicated with the first feedback return port 51 of the (n + 1) th fluidic oscillator to form a first feedback channel 61; the second feedback outlet 42 of the nth fluidic oscillator is communicated with the second feedback return port 52 of the (n + 1) th fluidic oscillator to form a second feedback channel 62; n is less than N;
the first feedback port of the 1 st fluidic oscillator is communicated with the second feedback outlet of the Nth fluidic oscillator to form a third feedback channel 63; the second feedback port of the 1 st fluidic oscillator is communicated with the first feedback outlet of the nth fluidic oscillator to form a fourth feedback channel 64.
Referring to fig. 2, when N is 2, i.e., the case where two fluidic oscillators are included in the array; the first feedback outlet 41 of the 1 st fluidic oscillator A1 is communicated with the first feedback outlet 51 of the 2 nd fluidic oscillator A2 to form a first feedback channel 61; the second feedback outlet 42 of the 1 st fluidic oscillator a1 is communicated with the second feedback port 52 of the 2 nd fluidic oscillator a2 to form a second feedback channel 62;
the first feedback port 51 of the 1 st fluidic oscillator is communicated with the second feedback outlet 42 of the 2 nd fluidic oscillator to form a third feedback channel 63; the second feedback port 52 of the 1 st fluidic oscillator is communicated with the first feedback outlet 41 of the 2 nd fluidic oscillator to form a fourth feedback channel 64.
Referring to fig. 3, when N is 4, i.e., the case where four fluidic oscillators are included in the array;
the first feedback outlet 41 of the 1 st fluidic oscillator A1 is communicated with the first feedback outlet 51 of the 2 nd fluidic oscillator A2 to form a first feedback channel 61; the second feedback outlet 42 of the 1 st fluidic oscillator a1 is communicated with the second feedback port 52 of the 2 nd fluidic oscillator a2 to form a second feedback channel 62;
the first feedback outlet 41 of the 2 nd fluidic oscillator A1 is communicated with the first feedback return port 51 of the 3 rd fluidic oscillator to form a first feedback channel; the second feedback outlet 42 of the 2 nd fluidic oscillator A1 is communicated with the second feedback port 52 of the 3 rd fluidic oscillator A3 to form a second feedback channel;
the first feedback outlet 41 of the 3 rd fluidic oscillator A3 is communicated with the first feedback outlet 51 of the 4 th fluidic oscillator A4 to form a first feedback channel; the second feedback outlet 42 of the 3 rd fluidic oscillator A3 is communicated with the second feedback outlet 52 of the 4 th fluidic oscillator A4 to form a second feedback channel
The first feedback port 51 of the 1 st fluidic oscillator A1 is communicated with the second feedback outlet 42 of the 4 th fluidic oscillator A4 to form a third feedback channel 63; the second feedback port 52 of the 1 st fluidic oscillator a1 is in communication with the first feedback outlet 41 of the 4 th fluidic oscillator a4 to form a fourth feedback channel 64.
In this embodiment, all the first feedback channels, all the second feedback channels, all the third feedback channels, and all the fourth feedback channels have the same length, and all the first feedback channels, all the second feedback channels, all the third feedback channels, and all the fourth feedback channels have the same cross-sectional area.
In this embodiment, the first feedback outlet of the nth fluidic oscillator and the first feedback return port of the (n + 1) th fluidic oscillator are movably or fixedly connected through a channel, and/or
The second feedback outlet of the nth fluid oscillator and the second feedback port of the (n + 1) th fluid oscillator are movably or fixedly connected through a channel, and/or
The first feedback port of the 1 st fluidic oscillator is movably or fixedly connected with the second feedback outlet of the Nth fluidic oscillator through a channel, and/or
The second feedback port of the 1 st fluidic oscillator is movably or fixedly connected with the first feedback outlet of the Nth fluidic oscillator through a channel.
In this embodiment, the movable connection mode may be implemented by using a connection structure such as a screw/bayonet connection, and the fixed connection mode may be implemented by welding, casting, or directly processing a corresponding feedback channel in the oscillator array. The channel of this implementation can be realized by the gas circuit passageway of equal length.
Example two:
the embodiment discloses a frequency synchronization method of a fluidic oscillator array, which selects a corresponding number of fluidic oscillators to form the fluidic oscillator array of the first embodiment of the fluidic oscillator array according to a flow separation range required to be controlled;
emitting a main jet flow, so that the main jet flow enters all the fluidic oscillators from inlets of the N fluidic oscillators simultaneously;
when the main jet is emitted from the first side wall channel or the second side wall channel of the nth fluidic oscillator through the first outlet or the second outlet, part of the jet is enabled to flow through the first feedback channel or the second feedback channel of the nth fluidic oscillator through the first feedback outlet or the second feedback outlet of the nth fluidic oscillator to flow to the first feedback port or the second feedback port of the (n + 1) th fluidic oscillator; at the moment, the pressure of the first feedback port or the second feedback port of the (n + 1) th fluidic oscillator is increased, and the main jet is forced to be emitted from the second outlet or the second outlet through the second side wall channel or the first side wall channel of the main jet;
when the main jet is emitted from the first outlet or the second outlet from the first side wall channel or the second side wall channel of the nth fluidic oscillator, part of the jet is caused to flow through the fourth feedback channel flow or the third feedback channel via the first feedback outlet or the second feedback outlet of the nth fluidic oscillator to be emitted to the second feedback port or the first feedback port of the 1 st fluidic oscillator, and at the moment, the pressure of the second feedback port or the first feedback port in the 1 st fluidic oscillator is increased, so that the main jet in the 1 st fluidic oscillator is forced to flow through the first side wall channel or the second side wall channel to be emitted from the first outlet or the second outlet;
the primary jet alternately exits from the first outlet or the second outlet of each fluidic oscillator; each fluidic oscillator is frequency synchronized.
As can be seen from the above synchronization method, since the feedback port of the 1 st fluidic oscillator is communicated with the feedback outlet of the nth fluidic oscillator, which makes the period of the alternate exit of the jet from the two outlets become larger after the oscillator arrays are connected in series, the array synchronization frequency is significantly lower than that when the fluidic oscillators are operated alone after the fluidic oscillator oscillation scheme and the synchronization method are used. This embodiment can expand the range of flow separation control by varying the number of oscillators in the array; also, according to the above method, by varying the pressure at the inlet, the frequency at which the array operates synchronously and the oscillating velocity profile of the outlet jet can be varied.
Example three:
an array of fluidic oscillators, the fluidic oscillators comprising: an inlet, a first sidewall channel, a second sidewall channel, a first outlet, a second outlet; the inlet is communicated with the first outlet through a first side wall channel; the inlet is communicated with the second outlet through a second side wall channel; the first side wall channel is provided with a first feedback outlet close to the first outlet; the second side wall channel is provided with a second feedback outlet close to the second outlet; the inlet is communicated with a first feedback return port and a second feedback return port;
referring to FIGS. 4 and 5, the fluidic oscillator array of the present embodiment includes the 1 st to Nth fluidic oscillators, N ≧ 2;
the second feedback outlet 42 of the nth fluidic oscillator is communicated with the first feedback return port 51 of the (n + 1) th fluidic oscillator to form a first feedback channel 61; the second feedback port 52 of the nth fluidic oscillator is communicated with the first feedback outlet 41 of the (n + 1) th fluidic oscillator to form a second feedback channel 62; n is less than N;
the first feedback outlet 41 of the 1 st fluidic oscillator is communicated with the first feedback return port 51 of the 1 st fluidic oscillator to form a third feedback channel 63; the second feedback outlet 42 of the nth fluidic oscillator is in communication with the second feedback port 52 of the nth fluidic oscillator to form a fourth feedback channel 64.
Referring to fig. 4 and 5, in this embodiment, the inlets of all the fluidic oscillators may be set to be in the same direction according to the application scenario requirement, in this case, the first feedback channels and the second feedback channels of adjacent oscillators intersect, and the two intersecting feedback channels cannot be in one plane.
Example four:
referring to fig. 6, the present embodiment is substantially the same as the third embodiment, and the difference is that: in order to make all feedback channels in one plane, the fluidic oscillators of the present embodiment may be arranged in an opposite manner, with the inlets of the nth fluidic oscillator and the (n + 1) th fluidic oscillator facing in opposite directions; therefore, the frequency synchronization of all the fluidic oscillators in the array can be ensured, and all the feedback channels can be in one plane without crossing, namely the first feedback channel and the second feedback channel do not cross.
Example five:
referring to fig. 7, the present embodiment is substantially the same as the fourth embodiment, and the difference is that: in order to make all feedback channels not intersect, and the outlets of all fluidic oscillators are located on the same control line, and to achieve frequency synchronization of all fluidic oscillators, the present embodiment may also adopt an arrangement as shown in fig. 6, that is: the nth fluidic oscillator and the (n + 1) th fluidic oscillator are arranged in a staggered mode, and the first inlet and the second inlet of all the fluidic oscillators are located on the same control line.
As a preferable solution of the third, fourth and fifth embodiments, lengths of all the first feedback channels, all the second feedback channels, all the third feedback channels and all the fourth feedback channels in the array are the same, and cross-sectional areas of all the first feedback channels, all the second feedback channels, all the third feedback channels and all the fourth feedback channels are the same.
The second feedback outlet of the nth fluidic oscillator is movably or fixedly connected with the first feedback outlet of the (N + 1) th fluidic oscillator through a channel, and/or the first feedback outlet of the 1 st fluidic oscillator is communicated with the first feedback outlet of the 1 st fluidic oscillator and movably or fixedly connected with the first feedback outlet of the nth fluidic oscillator through a channel, and/or the second feedback outlet of the nth fluidic oscillator is movably or fixedly connected with the second feedback outlet of the nth fluidic oscillator through a channel. The technical scheme of the movable connection and the fixed connection can be the same as that of the first embodiment.
Example six:
a frequency synchronization method of a fluidic oscillator array comprises the fluidic oscillator array of any one of the third embodiment, the fourth embodiment and the fifth embodiment of the fluidic oscillator array of the present disclosure;
emitting a main jet flow, so that the main jet flow enters all the fluidic oscillators from inlets of the N fluidic oscillators simultaneously;
when the main jet flow is emitted from the nth fluidic oscillator from the first outlet through the first side wall channel, part of the jet flow flows through the first feedback channel via the first feedback outlet of the nth fluidic oscillator to the second feedback outlet of the (n-1) th fluidic oscillator to be emitted due to the restriction of the resistance of the first outlet; at the moment, the pressure of the second feedback port of the (n-1) th fluidic oscillator is increased, and the main jet is forced to be emitted from the first outlet through the first side wall channel of the main jet;
when the main jet is emitted from the second outlet through the second side wall channel of the nth fluidic oscillator, part of the jet flows through the second feedback channel via the second feedback outlet of the nth fluidic oscillator to the first feedback outlet of the (n + 1) th fluidic oscillator to be emitted due to the resistance limitation of the second outlet; at the moment, the pressure of the first feedback port of the (n + 1) th fluidic oscillator is increased, and the main jet is forced to be emitted from the second outlet through the second side wall channel of the main jet;
when the main jet flows through the first side wall channel of the 1 st fluidic oscillator and is emitted from the first outlet of the fluidic oscillator, part of the main jet flows through the third feedback channel and is emitted from the first feedback port of the fluidic oscillator due to the restriction of the resistance of the first outlet, and the pressure of the first feedback port of the 1 st fluidic oscillator is increased at the moment, so that the main jet is forced to be emitted from the second outlet through the second side wall channel of the main jet;
when the main jet flows through the second side wall channel of the Nth fluidic oscillator and is emitted from the second outlet of the Nth fluidic oscillator, the resistance of the second outlet of the main jet is limited, so that part of the jet flows through the fourth feedback channel and is emitted from the second feedback port of the Nth fluidic oscillator, and the pressure of the second feedback port of the Nth fluidic oscillator is increased at the moment, so that the main jet is forced to be emitted from the first outlet through the first side wall channel of the main jet;
the primary jet alternately exits from the first outlet or the second outlet of each fluidic oscillator; each fluidic oscillator is frequency synchronized.
In this embodiment, the range of flow separation control can also be expanded by changing the number of fluidic oscillators in the array.
According to the synchronization method, a third feedback channel is formed by the communication of the first feedback outlet of the 1 st fluidic oscillator and the first feedback back port of the 1 st fluidic oscillator; and the second feedback outlet of the Nth fluidic oscillator is communicated with the second feedback port of the Nth fluidic oscillator to form a fourth feedback channel. This results in the period of alternating exit of the jets from the two outlets being substantially constant after the oscillator arrays are connected in series, so that, using the fluidic oscillator oscillation scheme and synchronization method described above, the array synchronization frequency is substantially the same as the frequency of the fluidic oscillator when operating alone (with an error of no more than 3%).
According to the four embodiments, the fluidic oscillator array frequency synchronization method disclosed by the invention can synchronize the oscillation frequencies of all the fluidic oscillators in an array containing two or more fluidic oscillators, and the adjacent oscillators have fixed phase difference during working, even if the oscillation frequencies of each fluidic oscillator during independent working are different, including different working frequencies of each fluidic oscillator caused by machining and assembly errors, the synchronization control is carried out by the synchronization method disclosed by the invention, so that the oscillators can be applied to large-range flow separation control, such as flow separation in an air inlet passage of an aircraft engine, in a centrifugal or axial compressor, in a high/low pressure compressor transition section, in a high/low pressure turbine transition section, in an aircraft flap and at a tail wing, the control efficiency of the flow separation is effectively improved, and the working efficiency of the engine is improved, the purpose of the airplane flight envelope is widened.
In the description of the present specification, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of the feature.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (14)
1. An array of fluidic oscillators, the fluidic oscillators comprising: an inlet, a first sidewall channel, a second sidewall channel, a first outlet, a second outlet;
the inlet is communicated with the first outlet through a first side wall channel; the inlet is communicated with the second outlet through a second side wall channel;
the first side wall channel is provided with a first feedback outlet close to the first outlet; the second side wall channel is provided with a second feedback outlet close to the second outlet; the inlet is communicated with a first feedback return port and a second feedback return port;
the device is characterized by comprising 1 st to Nth fluid oscillators, wherein N is more than or equal to 2;
a first feedback outlet of the nth fluidic oscillator is communicated with a first feedback port of the (n + 1) th fluidic oscillator to form a first feedback channel; a second feedback outlet of the nth fluidic oscillator is communicated with a second feedback port of the (n + 1) th fluidic oscillator to form a second feedback channel; n is less than N;
a first feedback port of the 1 st fluidic oscillator is communicated with a second feedback outlet of the Nth fluidic oscillator to form a third feedback channel; and the second feedback port of the 1 st fluidic oscillator is communicated with the first feedback outlet of the Nth fluidic oscillator to form a fourth feedback channel.
2. A fluidic oscillator array according to claim 1, wherein: all the first feedback channels, all the second feedback channels, the third feedback channels and the fourth feedback channels have the same length, and the cross-sectional areas of all the first feedback channels, all the second feedback channels, the third feedback channels and the fourth feedback channels are the same.
3. A fluidic oscillator array according to claim 1 or 2, wherein: the first feedback outlet of the nth fluidic oscillator and the first feedback port of the (n + 1) th fluidic oscillator are movably or fixedly connected through a channel, and/or
The second feedback outlet of the nth fluid oscillator and the second feedback port of the (n + 1) th fluid oscillator are movably or fixedly connected through a channel, and/or
The first feedback port of the 1 st fluidic oscillator is movably or fixedly connected with the second feedback outlet of the Nth fluidic oscillator through a channel, and/or
The second feedback port of the 1 st fluidic oscillator is movably or fixedly connected with the first feedback outlet of the Nth fluidic oscillator through a channel.
4. An array of fluidic oscillators, the fluidic oscillators comprising: an inlet, a first sidewall channel, a second sidewall channel, a first outlet, a second outlet;
the inlet is communicated with the first outlet through a first side wall channel; the inlet is communicated with the second outlet through a second side wall channel;
the first side wall channel is provided with a first feedback outlet close to the first outlet; the second side wall channel is provided with a second feedback outlet close to the second outlet; the inlet is communicated with a first feedback return port and a second feedback return port;
the device is characterized by comprising 1 st to Nth fluid oscillators, wherein N is more than or equal to 2;
a second feedback outlet of the nth fluidic oscillator is communicated with a first feedback back port of the (n + 1) th fluidic oscillator to form a first feedback channel; a second feedback port of the nth fluidic oscillator is communicated with a first feedback outlet of the (n + 1) th fluidic oscillator to form a second feedback channel; n is less than N;
the first feedback outlet of the 1 st fluidic oscillator is communicated with the first feedback return port of the 1 st fluidic oscillator to form a third feedback channel; a second feedback outlet of the Nth fluidic oscillator is communicated with a second feedback port of the Nth fluidic oscillator to form a fourth feedback channel;
and inlets of all the fluidic oscillators are in the same direction, and the first feedback channel and the second feedback channel are crossed.
5. A fluidic oscillator array according to claim 4, wherein: all the first feedback channels, all the second feedback channels, the third feedback channels and the fourth feedback channels have the same length, and the cross-sectional areas of all the first feedback channels, all the second feedback channels, the third feedback channels and the fourth feedback channels are the same.
6. A fluidic oscillator array according to claim 4, wherein: the second feedback outlet of the nth fluidic oscillator is movably or fixedly connected with the first feedback port of the (n + 1) th fluidic oscillator through a channel, and/or
The second feedback port of the nth fluidic oscillator is movably or fixedly connected with the first feedback outlet of the (n + 1) th fluidic oscillator through a channel, and/or
The first feedback outlet of the 1 st fluidic oscillator is communicated with the first feedback return port of the 1 st fluidic oscillator and is movably or fixedly connected through a channel, and/or
And the second feedback outlet of the Nth fluidic oscillator is movably or fixedly connected with the second feedback port of the Nth fluidic oscillator through a channel.
7. An array of fluidic oscillators, the fluidic oscillators comprising: an inlet, a first sidewall channel, a second sidewall channel, a first outlet, a second outlet;
the inlet is communicated with the first outlet through a first side wall channel; the inlet is communicated with the second outlet through a second side wall channel;
the first side wall channel is provided with a first feedback outlet close to the first outlet; the second side wall channel is provided with a second feedback outlet close to the second outlet; the inlet is communicated with a first feedback return port and a second feedback return port;
the device is characterized by comprising 1 st to Nth fluid oscillators, wherein N is more than or equal to 2;
a second feedback outlet of the nth fluidic oscillator is communicated with a first feedback back port of the (n + 1) th fluidic oscillator to form a first feedback channel; a second feedback port of the nth fluidic oscillator is communicated with a first feedback outlet of the (n + 1) th fluidic oscillator to form a second feedback channel; n is less than N;
the first feedback outlet of the 1 st fluidic oscillator is communicated with the first feedback return port of the 1 st fluidic oscillator to form a third feedback channel; a second feedback outlet of the Nth fluidic oscillator is communicated with a second feedback port of the Nth fluidic oscillator to form a fourth feedback channel;
the inlet of the nth fluidic oscillator and the inlet of the (n + 1) th fluidic oscillator face opposite directions; the first feedback path and the second feedback path have no intersection.
8. A fluidic oscillator array according to claim 7, wherein: the nth fluidic oscillator and the (n + 1) th fluidic oscillator are arranged in a staggered mode, and the first inlet and the second inlet of all the fluidic oscillators are located on the same control line.
9. A fluidic oscillator array according to claim 7 or 8, wherein: all the first feedback channels, all the second feedback channels, the third feedback channels and the fourth feedback channels have the same length, and the cross-sectional areas of all the first feedback channels, all the second feedback channels, the third feedback channels and the fourth feedback channels are the same.
10. A fluidic oscillator array according to claim 7 or 8, wherein: the second feedback outlet of the nth fluidic oscillator is movably or fixedly connected with the first feedback port of the (n + 1) th fluidic oscillator through a channel, and/or
The second feedback port of the nth fluidic oscillator is movably or fixedly connected with the first feedback outlet of the (n + 1) th fluidic oscillator through a channel, and/or
The first feedback outlet of the 1 st fluidic oscillator is communicated with the first feedback return port of the 1 st fluidic oscillator and is movably or fixedly connected through a channel, and/or
And the second feedback outlet of the Nth fluidic oscillator is movably or fixedly connected with the second feedback port of the Nth fluidic oscillator through a channel.
11. A method for synchronizing the frequency of a fluidic oscillator array, wherein a corresponding number of fluidic oscillators are selected to form the fluidic oscillator array according to any one of claims 1 to 3 according to the flow separation range to be controlled;
emitting a main jet flow from inlets of the N fluidic oscillators into all the fluidic oscillators simultaneously;
when the main jet is emitted from the first side wall channel or the second side wall channel of the nth fluidic oscillator through the first outlet or the second outlet, part of the jet is enabled to flow through the first feedback channel or the second feedback channel of the nth fluidic oscillator through the first feedback outlet or the second feedback outlet of the nth fluidic oscillator to flow to the first feedback port or the second feedback port of the (n + 1) th fluidic oscillator; at the moment, the pressure of the first feedback port or the second feedback port of the (n + 1) th fluidic oscillator is increased, and the main jet is forced to be emitted from the second outlet or the second outlet through the second side wall channel or the first side wall channel of the main jet;
when the main jet is emitted from the first outlet or the second outlet from the first side wall channel or the second side wall channel of the nth fluidic oscillator, part of the jet is caused to flow through the fourth feedback channel flow or the third feedback channel via the first feedback outlet or the second feedback outlet of the nth fluidic oscillator to be emitted to the second feedback port or the first feedback port of the 1 st fluidic oscillator, and at the moment, the pressure of the second feedback port or the first feedback port in the 1 st fluidic oscillator is increased, so that the main jet in the 1 st fluidic oscillator is forced to flow through the first side wall channel or the second side wall channel to be emitted from the first outlet or the second outlet;
the primary jet alternately exits from the first outlet or the second outlet of each fluidic oscillator; each fluidic oscillator is frequency synchronized.
12. A method of frequency synchronization of a fluidic oscillator array according to claim 11, wherein: the inlet pressure is adjusted according to the desired array synchronization frequency and/or according to the oscillating velocity profile of the outlet jet.
13. A method for synchronizing the frequency of a fluidic oscillator array, wherein a corresponding number of fluidic oscillators are selected to form the fluidic oscillator array according to any one of claims 4 to 10 according to the flow separation range to be controlled;
emitting a main jet flow to enter all the fluidic oscillators from inlets of the N fluidic oscillators at the same time;
when the main jet flow is emitted from the nth fluidic oscillator from the first outlet through the first side wall channel, part of the jet flow flows through the first feedback channel via the first feedback outlet of the nth fluidic oscillator to the second feedback outlet of the (n-1) th fluidic oscillator to be emitted due to the restriction of the resistance of the first outlet; at the moment, the pressure of the second feedback port of the (n-1) th fluidic oscillator is increased, and the main jet is forced to be emitted from the first outlet through the first side wall channel of the main jet;
when the main jet is emitted from the second outlet through the second side wall channel of the nth fluidic oscillator, part of the jet flows through the second feedback channel via the second feedback outlet of the nth fluidic oscillator to the first feedback outlet of the (n + 1) th fluidic oscillator to be emitted due to the resistance limitation of the second outlet; at the moment, the pressure of the first feedback port of the (n + 1) th fluidic oscillator is increased, and the main jet is forced to be emitted from the second outlet through the second side wall channel of the main jet;
when the main jet flows through the first side wall channel of the 1 st fluidic oscillator and is emitted from the first outlet of the fluidic oscillator, part of the main jet flows through the third feedback channel and is emitted from the first feedback port of the fluidic oscillator due to the restriction of the resistance of the first outlet, and the pressure of the first feedback port of the 1 st fluidic oscillator is increased at the moment, so that the main jet is forced to be emitted from the second outlet through the second side wall channel of the main jet;
when the main jet flows through the second side wall channel of the Nth fluidic oscillator and is emitted from the second outlet of the Nth fluidic oscillator, the resistance of the second outlet of the main jet is limited, so that part of the jet flows through the fourth feedback channel and is emitted from the second feedback port of the Nth fluidic oscillator, and the pressure of the second feedback port of the Nth fluidic oscillator is increased at the moment, so that the main jet is forced to be emitted from the first outlet through the first side wall channel of the main jet;
the primary jet alternately exits from the first outlet or the second outlet of each fluidic oscillator; each fluidic oscillator is frequency synchronized.
14. A method of frequency synchronization of a fluidic oscillator array according to claim 13, wherein: the inlet pressure is adjusted according to the desired array synchronization frequency and/or according to the oscillating velocity profile of the outlet jet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910758278.8A CN110449309B (en) | 2019-08-16 | 2019-08-16 | Fluid oscillator array and frequency synchronization method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910758278.8A CN110449309B (en) | 2019-08-16 | 2019-08-16 | Fluid oscillator array and frequency synchronization method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110449309A CN110449309A (en) | 2019-11-15 |
| CN110449309B true CN110449309B (en) | 2020-06-26 |
Family
ID=68487108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910758278.8A Active CN110449309B (en) | 2019-08-16 | 2019-08-16 | Fluid oscillator array and frequency synchronization method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110449309B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111623505B (en) * | 2020-05-25 | 2022-03-15 | 太原理工大学 | Self-oscillation jet flow type mixing-increasing heat exchange air outlet device |
| CN111810295B (en) * | 2020-07-17 | 2022-03-04 | 中国航空发动机研究院 | Flow separation active control structure, method and application |
| CN111810454A (en) * | 2020-07-17 | 2020-10-23 | 中国航空发动机研究院 | Casing, compressor and stability expanding method based on self-circulation oscillation jet flow |
| CN113074047A (en) * | 2021-03-04 | 2021-07-06 | 南京航空航天大学 | S-shaped air inlet channel rotational flow distortion flow control device based on fluid oscillator |
| CN113404747B (en) * | 2021-06-29 | 2022-10-18 | 上海交通大学 | Outlet same-phase control and frequency decoupling oscillator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2286582C2 (en) * | 2004-12-10 | 2006-10-27 | 4 Центральный Научно-исследовательский институт Минобороны России | Fluid-jet accelerometer with digital output |
| WO2008135967A1 (en) * | 2007-05-02 | 2008-11-13 | Ramot At Tel Aviv University Ltd. | Apparatus and method for oscillating fluid jets |
| CN106662328A (en) * | 2014-09-12 | 2017-05-10 | 西门子公司 | Burner comprising a fluidic oscillator, for a gas turbine, and a gas turbine comprising at least one such burner |
| CN206526761U (en) * | 2017-01-14 | 2017-09-29 | 辽宁工业大学 | One kind is based on Piezoelectric Driving integrated form micro-mixer |
| CN107750288A (en) * | 2015-06-18 | 2018-03-02 | 塞罗斯有限公司 | With the apparatus and method of ozone bubbles processing base material |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5639022A (en) * | 1994-11-30 | 1997-06-17 | The United States Of America As Represented By The Secretary Of The Navy | Supersonic fluid dispersing injector |
| US7128082B1 (en) * | 2005-08-10 | 2006-10-31 | General Electric Company | Method and system for flow control with fluidic oscillators |
| US7481119B2 (en) * | 2006-11-22 | 2009-01-27 | National Tsing Hua University | Micro-fluidic oscillator having a sudden expansion region at the nozzle outlet |
| US9333517B2 (en) * | 2013-03-06 | 2016-05-10 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Fluidic oscillator array for synchronized oscillating jet generation |
| CN106368609A (en) * | 2016-11-09 | 2017-02-01 | 西南石油大学 | Jet flow oscillating tool |
| US11085469B2 (en) * | 2017-10-11 | 2021-08-10 | Ohio State Innovation Foundation | Frequency-synchronized fluidic oscillator array |
| CN108722694A (en) * | 2018-04-12 | 2018-11-02 | 南京航空航天大学 | A kind of supersonic jet oscillator |
-
2019
- 2019-08-16 CN CN201910758278.8A patent/CN110449309B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2286582C2 (en) * | 2004-12-10 | 2006-10-27 | 4 Центральный Научно-исследовательский институт Минобороны России | Fluid-jet accelerometer with digital output |
| WO2008135967A1 (en) * | 2007-05-02 | 2008-11-13 | Ramot At Tel Aviv University Ltd. | Apparatus and method for oscillating fluid jets |
| CN106662328A (en) * | 2014-09-12 | 2017-05-10 | 西门子公司 | Burner comprising a fluidic oscillator, for a gas turbine, and a gas turbine comprising at least one such burner |
| CN107750288A (en) * | 2015-06-18 | 2018-03-02 | 塞罗斯有限公司 | With the apparatus and method of ozone bubbles processing base material |
| CN206526761U (en) * | 2017-01-14 | 2017-09-29 | 辽宁工业大学 | One kind is based on Piezoelectric Driving integrated form micro-mixer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110449309A (en) | 2019-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110449309B (en) | Fluid oscillator array and frequency synchronization method thereof | |
| US8136767B2 (en) | Method and system for flow control with arrays of dual bimorph synthetic jet fluidic actuators | |
| CN111623010B (en) | Pulse scanning type fluid oscillation exciter | |
| Gnani et al. | Pseudo-shock waves and their interactions in high-speed intakes | |
| EP1760262B1 (en) | Method and system for flow control with fluidic oscillators | |
| CN111810454A (en) | Casing, compressor and stability expanding method based on self-circulation oscillation jet flow | |
| US8944370B2 (en) | Plasma actuating propulsion system for aerial vehicles | |
| US9339825B2 (en) | Fluidic oscillator having decoupled frequency and amplitude control | |
| CN111810295B (en) | Flow separation active control structure, method and application | |
| WO2002029232A1 (en) | Apparatus, method and system for gas turbine engine noise reduction | |
| US9551296B2 (en) | Method and apparatus for nozzle thrust vectoring | |
| EP2682612B1 (en) | Device for generating fluid pulses | |
| Bauer | Design and application of a fluidic actuator system for high lift flow control | |
| CN114919732A (en) | Loop volume control method suitable for wings | |
| CN109618481B (en) | Plasma synthetic jet actuator with low Reynolds number condition | |
| US10717519B2 (en) | Simplified fluidic oscillator for controlling aerodynamics of an aircraft | |
| EP2306029A1 (en) | Compressor and method for controlling the fluid flow in a compressor | |
| US4319201A (en) | Self compressing supersonic flow device | |
| CN114987739A (en) | Single feedback channel oscillation jet flow exciter | |
| JP5379148B2 (en) | Apparatus and method for controlling vortex structure in turbulent air jets | |
| CN112781071A (en) | Method for controlling concave cavity flow by exciting arc discharge on different sides | |
| RU2637235C1 (en) | Pulse plasma heat actuator of ejector type | |
| RU2716650C1 (en) | Pulse resonator ejector | |
| RU2773484C1 (en) | Pulsed resonator ejector | |
| Koklu | Fluidic Oscillator Having Decoupled Frequency and Amplitude Control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |