CN111879493A - Flow field data measuring device, measuring method and measurement control system - Google Patents
Flow field data measuring device, measuring method and measurement control system Download PDFInfo
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- CN111879493A CN111879493A CN202010681515.8A CN202010681515A CN111879493A CN 111879493 A CN111879493 A CN 111879493A CN 202010681515 A CN202010681515 A CN 202010681515A CN 111879493 A CN111879493 A CN 111879493A
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Abstract
The invention discloses a flow field data measuring device, a flow field data measuring method and a flow field data measuring control system. The flow field data measuring device comprises a control and drive system and a flow field test system; the control and drive system is used for sending a test signal to the flow field test system according to a test time sequence so as to start or stop different test tasks and collect test data; and the flow field test system is used for executing different test tasks according to the test signals sent by the control and drive system. According to the flow field data measuring device, the flow field data measuring method and the flow field data measuring control system, synchronous and asynchronous measurement of a plurality of flow field physical quantities is realized by combining a plurality of testing technologies in a wind tunnel test through simple control logic, and the accurate and convenient replacement of a testing station is realized, so that the time-space correlation analysis among the physical quantities is facilitated.
Description
Technical Field
The invention relates to a flow field data measuring device, a flow field data measuring method and a flow field data measuring control system, and belongs to the technical field of fluid measurement.
Background
In the research of fluid mechanics, wind tunnel tests play a crucial role, for example, providing test data support for industrial design so as to improve design parameters; specific fluid motion phenomena were discovered or validated in basic research. In addition, since the fluid physical quantities themselves have complicated temporal and spatial variation characteristics due to the influence of various factors (boundary conditions, driving load, etc.), and they are in a certain relationship with each other, it is necessary to sufficiently observe a plurality of physical quantities in order to sufficiently reflect the physical mechanism behind the flow phenomenon. At present, abundant fluid testing technologies such as a hot-wire anemometer, a particle image velocimetry, a laser Doppler and the like have been developed in experimental hydrodynamics, but the testing technologies are still lack of a combined use case in an actual wind tunnel test, the testing of most experiments on fluid physical quantities only meets the measurement of a single physical quantity or the successive measurement of a plurality of physical quantities, and once a testing device is built, a testing station is not easy to change, so that experimental testing data or diversity is poor, or the time-space correlation among the data cannot be reflected.
Disclosure of Invention
In order to solve the problems, the invention provides an accurate, convenient and controllable flow field data measuring device, a measuring method and a measuring control system, which can realize synchronous and asynchronous measurement of a plurality of flow field physical quantities by jointly using a plurality of testing technologies in a primary wind tunnel test based on an automatic control principle, can quickly and conveniently change a testing station and realize time-space correlation analysis of flow field testing data.
In a first aspect, the present invention provides a flow field data measurement device comprising a control and drive system and a flow field test system. And the control and drive system is used for sending a test signal to the flow field test system according to the test time sequence so as to start or stop different test tasks and collect test data. And the flow field test system is used for executing different test tasks according to the test signals sent by the control and drive system.
In a preferred embodiment, the control and drive system comprises an upper computer, a synchronous controller, a signal generator, a signal collector and a displacement mechanism. And the upper computer is provided with control software and is used for sending the test time sequence instruction to the synchronous controller. The synchronous controller sends a test trigger signal according to a test time sequence through the control signal generator, and starts or stops test tasks of different test devices in the flow field test system in a combined or independent mode. The signal collector is used for collecting the test result of the flow field test system and storing the test result into the upper computer. The test result includes a timing signal and an image signal.
In a preferred embodiment, the flow field test system comprises one or more of a pitot tube, a five-hole probe, a Particle Image Velocimeter (PIV), a hot wire anemometer; in a more preferred embodiment, the flow field test system comprises a pitot tube, a five-hole probe, a particle image velocimetry device (PIV device), and a hot wire anemometer. The pitot tube is fixed on the wall surface of the wind tunnel, and the testing position of the main flow outside the turbulent boundary layer is used for measuring the wind speed of the main flow; the five-hole probe is fixed on the wall surface of the wind tunnel, and the testing position of the main flow outside the turbulent flow boundary layer is used for measuring the deflection angle of the main flow; the PIV equipment comprises a PIV laser, a PIV camera and a tracing particle generator, the PIV laser and the PIV camera are arranged on the outer side of the wind tunnel, a laser plane is superposed with a focal plane of the camera, and the PIV equipment is used for measuring a two-dimensional velocity field; the hot wire anemometer is carried on the mobile structure and used for measuring a single-point speed signal at the jet flow outlet and a single-point speed gradient signal at the downstream of the jet flow outlet, wherein the single-point speed signal refers to the speed of a fluid at a certain point, and the single-point speed gradient signal refers to the change rate of the speed of a flow field at a certain point in the normal direction of the flat plate.
In a preferred embodiment, the hot-wire anemometer comprises a single wire hot-wire anemometer and an array twin wire hot-wire anemometer; the transfer mechanism comprises a first transfer mechanism and a second transfer mechanism; the monofilament hot wire anemometer is carried on the first moving and measuring mechanism, controllably moves back and forth in the vertical direction and is used for measuring a single-point speed signal at a jet flow outlet; the array twin-wire hot-wire anemometer is carried on the second moving and measuring mechanism, controllably moves back and forth in the horizontal direction, and is used for measuring single-point velocity gradient signals at the downstream of the jet flow outlet.
In a preferred embodiment, the flow field test system further comprises a wire mixing, a loudspeaker and a flat plate. The stirring line is fixed on the flat plate, the stirring line and the flat plate are used for generating a turbulent boundary layer, and the zero-pressure gradient can be maintained in a flat plate test area by adjusting the tail of the flat plate; the loudspeaker and the single-wire hot-wire anemoscope are respectively arranged on two sides of the position of the flat jet hole, the loudspeaker is used for generating zero-mass jet flow, and the single-wire hot-wire anemoscope is used for measuring a single-point speed signal at the outlet of the jet flow. .
In a second aspect, the present invention provides a flow field data measuring method, comprising the steps of:
s1: installing a control and drive system and a flow field test system;
s2: carrying out calibration and calibration before experiment;
s3: starting the wind tunnel, operating control software on the upper computer after the wind tunnel runs stably, operating the upper computer to send a test time sequence instruction, communicating with the synchronous controller, so that the control signal generator sends a test trigger signal according to the test time sequence, starting or stopping test tasks of different test equipment in the flow field test system in a combined or independent mode, and after data is measured, acquiring a test result of the flow field test system by the signal acquisition unit and storing the test result in the upper computer;
s4: changing the test position according to the requirement of the test point position, and continuing to measure;
s5: after the measurement is completed, various data are analyzed.
In a preferred embodiment, the S1 step includes: erecting a PIV camera and a PIV laser outside the wind tunnel to enable a laser plane to be superposed with a focal plane of the camera; fixing a pitot tube and a five-hole probe on the wall surface of the wind tunnel, and enabling a testing position to be positioned on the main flow outside a turbulent flow boundary layer; the hot wire anemometer and the displacement mechanism are mounted. In a more preferred embodiment, the single-wire hot-wire anemometer is mounted on the first movement mechanism so as to be reciprocally controllable in the vertical direction; the array twin-wire hot-wire anemometer is mounted on the second displacement mechanism so as to be capable of reciprocating controllable displacement in the horizontal direction.
In a preferred embodiment, the S2 step includes: setting an incoming flow speed; determining physical quantity and sampling parameters required to be acquired; and (4) planning a test time sequence of joint or independent work of all test equipment of the flow field test system. In a more preferred embodiment, the physical quantity comprises one or more of a mainstream wind speed, a mainstream flow deflection angle, a two-dimensional velocity field, a single point velocity signal at the jet outlet, and a single point velocity gradient signal downstream of the jet outlet; in a most preferred embodiment, the physical quantity comprises a main flow wind speed, a main flow deflection angle, a two-dimensional velocity field, a single point velocity signal at the jet outlet and a single point velocity gradient signal downstream of the jet outlet. In a more preferred embodiment, the sampling parameters include a sampling frequency and a sampling duration.
In a preferred embodiment, the S3 step includes: starting the wind tunnel, running control software on the upper computer after the wind tunnel runs stably, operating the upper computer to send a test time sequence instruction, and communicating with the synchronous controller; firstly, a synchronous controller regulates and controls a signal generator to jointly trigger a pitot tube and a five-hole probe, and monitors and measures the main flow wind speed and the air flow deflection angle; after the flow field is stable and meets the test requirements, triggering the single-wire hot-wire anemoscope, the double-wire hot-wire anemoscope and the PIV measurement system according to a planned time sequence to acquire data; and the signal collector collects the test result of the flow field test system and stores the test result into the upper computer.
In a more preferred embodiment, the single wire hot wire anemometer, the twin wire hot wire anemometer, and the PIV measurement system are triggered according to a predetermined timing, and the system includes: triggering a loudspeaker and a monofilament hot wire anemometer, and monitoring and measuring a single-point speed signal at a jet flow outlet; after the single-wire hot-wire anemoscope detects the speed pulsation caused by the stable zero-mass jet flow, the downstream array double-wire hot-wire anemoscope is further triggered to work according to the upstream and downstream positions of the single-wire hot-wire anemoscope and the phase change of the loudspeaker signal, and the single-point speed gradient signal at the downstream of the jet flow outlet is monitored and measured; when the flow structure reaches the downstream laser plane formed by the PIV laser, the PIV device is further triggered to work, and a two-dimensional velocity field is measured.
In a preferred embodiment, the S4 step includes: and triggering the first moving and measuring mechanism and/or the second moving and measuring mechanism according to the requirement of the test site, further moving the single-wire hot-wire anemometer and/or the array double-wire hot-wire anemometer, adjusting the positions of the PIV camera and the PIV laser, changing the test position, and continuing to measure. In a more preferred embodiment, the second movement mechanism is triggered to move the array twin-wire hot-wire anemometer, and the position of the PIV camera and the PIV laser is adjusted to change the test position and continue the measurement according to the requirement of the test site.
In a third aspect, the invention provides a flow field data measurement control system, which includes a movement measurement mechanism control module, a signal generation module, a signal acquisition module and a data storage module. The movement control module of the movement mechanism controls the movement of the movement mechanism through the signal generator according to a first parameter set value; the signal generation module selects different trigger modes according to the test timing sequence instruction, communicates with the synchronous controller, regulates and controls the signal generator to trigger corresponding flow field test equipment, and measures the physical quantity of a flow field; the signal acquisition module acquires the measured physical quantity data of the corresponding flow field test equipment through the signal acquisition device according to the second parameter set value; the data storage module is used for storing the data acquired by the signal acquisition unit.
In a preferred embodiment, the trigger modes include single channel triggers, multi-channel synchronous triggers, and multi-channel asynchronous triggers. The single-channel triggering refers to triggering a single measuring device to collect data; the multichannel synchronous triggering refers to selecting a plurality of measuring instruments for synchronous triggering; the multichannel asynchronous triggering refers to that a plurality of measuring instruments are selected to perform asynchronous triggering or sequentially perform triggering according to a planned test time sequence.
In a preferred embodiment, the first parameter setting value includes a target point coordinate, a moving speed, and the like; the second parameter setting value comprises sampling frequency, sampling duration and the like.
According to the flow field data measuring device, the flow field data measuring method and the flow field data measuring control system, synchronous and asynchronous measurement of a plurality of flow field physical quantities is realized by combining a plurality of testing technologies in a wind tunnel test through simple control logic, and the accurate and convenient replacement of a testing station is realized, so that the time-space correlation analysis among the physical quantities is facilitated.
Drawings
Fig. 1 is a schematic view of a flow field data measuring device of the present invention, which is applied to a flow field multi-technology linkage measurement control technology.
Fig. 2 is a logic block diagram of the flow field data measuring method of the present invention.
FIG. 3 is a schematic diagram of a flow field data measurement control system according to the present invention.
In the drawings of the invention, the reference numerals are as follows:
1. the device comprises a control and drive system (comprising an upper computer, a synchronous controller, a signal generator and a signal acquisition card), 2, a pitot tube, 3, a five-hole probe, 4 ', a first moving and measuring mechanism, 4', a second moving and measuring mechanism, 5, a single-wire hot-wire anemoscope, 6, a wire mixing device, 7, a PIV laser, 8, a loudspeaker, 9, a flat plate, 10, a PIV camera, 11 and an array double-wire hot-wire anemoscope.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A flow field data measuring device, a flow field data measuring method, and a flow field data measurement control system according to embodiments of the present invention will be described below with reference to fig. 1 to 3, in this embodiment, a wind tunnel experiment for measuring an influence of a flow structure generated by a zero-mass jet in a turbulent boundary layer on a wall surface friction stress is performed.
Fig. 1 shows a schematic view of a flow field data measuring device of the present invention. Including the control and drive system 1 and the flow field test system. The control and drive system 1 is configured to send a test signal to the flow field test system according to a test timing sequence, so as to start or stop different test tasks and collect test data. The flow field test system is used for executing different test tasks according to the test signals sent by the control and drive system.
Specifically, the control and drive system 1 comprises an upper computer, a synchronous controller, a signal generator, a signal collector, a first side moving mechanism 4' and a second side moving mechanism 4 ". The upper computer is provided with control software and is used for sending the test time sequence instruction to the synchronous controller. The synchronous controller sends a test trigger signal according to a test time sequence through the control signal generator, and starts or stops test tasks of different test devices in the flow field test system in a combined or independent mode. The signal collector is used for collecting the test result of the flow field test system and storing the test result into the upper computer. According to different flow field test equipment, the test result comprises a time sequence signal and an image signal.
The flow field testing system comprises a pitot tube 2, a five-hole probe 3, a Particle Image Velocimetry (PIV) device, a single-wire hot-wire anemometer 5, an array double-wire hot-wire anemometer 11, a mixing wire 6, a loudspeaker 8 and a flat plate 9. The pitot tube 2 is fixed on the wall surface of the wind tunnel, so that the testing position is located outside a turbulent boundary layer of the main flow and is used for measuring the wind speed of the main flow. The five-hole probe 3 is fixed on the wall surface of the wind tunnel, so that the test position is positioned at the main flow outside the turbulent flow boundary layer and is used for measuring the main flow deflection angle. The PIV equipment comprises a PIV laser 7, a PIV camera 10 and a tracing particle generator (not shown in the figure), the PIV laser and the PIV camera are arranged on the outer side of the wind tunnel, a laser plane coincides with a focal plane of the camera, and the PIV equipment is used for measuring a two-dimensional speed field. The monofilament hot wire anemometer 5 is carried on the first moving and measuring mechanism 4', controllably moves back and forth in the vertical direction and is used for measuring a single-point speed signal at a jet flow outlet; the array twin-wire hot-wire anemometer 11 is carried on the second moving and measuring mechanism 4' and controllably moves back and forth in the horizontal direction to measure a single-point velocity gradient signal at the downstream of the jet flow outlet. The mixing line 6 is fixed on the flat plate 9 and used for generating a turbulent boundary layer with the flat plate 9, and the zero-pressure gradient can be maintained in the flat plate test area by adjusting the tail part of the flat plate. The loudspeaker 8 and the monofilament hot-wire anemometer 5 are respectively arranged on two sides of the position of the flat jet hole, and the loudspeaker 8 is used for generating zero-mass jet.
Fig. 2 shows a logic block diagram of the flow field data measurement method of the present invention, which includes the following steps:
s1: installing a control and drive system 1 and a flow field test system:
s101: installing a flat plate 9 in the wind tunnel working section, and adjusting the tail of the flat plate to maintain a zero-pressure gradient in a test area of the flat plate 9;
s102: mounting a loudspeaker 8 at the position of the flat jet hole;
s103: erecting a PIV camera 10 and a PIV laser 7 outside the wind tunnel to enable a laser plane to be superposed with a camera focal plane;
s104: fixing a pitot tube 2 and a five-hole probe 3 on the wall surface of the wind tunnel, and moving to corresponding test positions to enable the test positions of the pitot tube 2 and the five-hole probe 3 to be located at corresponding positions of main flows outside a turbulent boundary layer;
s105: carrying a monofilament hot-wire anemometer 5 on a first moving mechanism 4' so that the monofilament hot-wire anemometer can controllably move back and forth in the vertical direction; the array twin-wire hot-wire anemometer 11 is mounted on the second movement mechanism 4 ″ so as to be reciprocally controllable in the horizontal direction.
S2: calibration and calibration before the experiment:
s201: setting an incoming flow speed;
s202: determining physical quantity and sampling parameters which need to be acquired, wherein the physical quantity comprises a main flow wind speed, a main flow deflection angle, a two-dimensional speed field, a single-point speed signal at a jet flow outlet and a single-point speed gradient signal at the downstream of the jet flow outlet, and the sampling parameters comprise sampling frequency and sampling duration;
s203: and (4) planning a test time sequence of joint or independent work of all test equipment of the flow field test system.
S3: the wind tunnel is started, after the wind tunnel runs stably, control software runs on the upper computer, the upper computer is operated to send a test time sequence instruction and communicates with the synchronous controller, so that the control signal generator sends a test trigger signal according to the test time sequence, test tasks of different test devices in the flow field test system are started or stopped in a combined or independent mode, and after data is measured, a signal collector collects test results of the flow field test system and stores the test results into the upper computer:
s301: starting the wind tunnel, running control software on the upper computer after the wind tunnel runs stably, operating the upper computer to send a test time sequence instruction, and communicating with the synchronous controller;
s302: firstly, a synchronous controller regulates and controls a signal generator to jointly trigger a pitot tube 2 and a five-hole probe 3, and monitors and measures the main flow wind speed and the main flow deflection angle;
s303: after the flow field is stable and meets the test requirements, further triggering the loudspeaker 8 and the monofilament hot wire anemometer 5, and monitoring and measuring a single-point speed signal at the jet flow outlet;
s304: after the single-wire hot-wire anemoscope 5 detects the speed pulsation caused by the stable zero-mass jet flow, the downstream array double-wire hot-wire anemoscope 11 is further triggered to work according to the phase change of the upstream and downstream positions of the single-wire hot-wire anemoscope 5 and the signal phase change of the loudspeaker 8, and the single-point speed gradient signal at the downstream of the jet flow outlet is monitored and measured;
s305: when the flow structure reaches a downstream laser surface formed by the PIV laser 7, further triggering the PIV equipment to work, and measuring a two-dimensional velocity field;
s306: and the signal collector collects the test result of the flow field test system and stores the test result into the upper computer.
S4: changing the test position according to the requirement of the test point position, and continuously measuring:
and triggering the second moving and measuring mechanism 4' according to the requirement of the test site, moving the array twin-wire hot-wire anemometer 11, adjusting the positions of the PIV camera 10 and the PIV laser 7, changing the test position, and continuing to measure.
S5: after the measurement is completed, various data are analyzed.
Fig. 3 shows a flow field data measurement control system of the present invention, which includes a mobile measurement mechanism control module, a signal generation module, a signal acquisition module, and a data storage module. The movement measuring mechanism control module controls the first movement measuring mechanism 4 'and the second movement measuring mechanism 4' to move through the signal generator according to the parameter set values (the target point coordinates and the movement speed). The signal generation module implements a logic block diagram according to fig. 2, selects single-channel triggering, multi-channel synchronous triggering or multi-channel asynchronous triggering according to a test time sequence instruction, and regulates and controls the signal generator to trigger the pitot tube 2, the five-hole probe 3, the single-wire hot-wire anemometer 5, the array double-wire hot-wire anemometer 11 and the PIV device through communication with the synchronous controller, so as to measure the physical quantity of the flow field. And the signal acquisition module acquires the measured physical quantity data of the corresponding flow field test equipment through the signal acquisition device according to the parameter set values (sampling frequency and sampling duration). The data storage module is used for storing the data acquired by the signal acquisition unit.
According to the flow field data measuring device, the flow field data measuring method and the flow field data measuring control system, synchronous and asynchronous measurement of a plurality of flow field physical quantities is realized by combining a plurality of testing technologies in a wind tunnel test through simple control logic, and the accurate and convenient replacement of a testing station is realized, so that the time-space correlation analysis among the physical quantities is facilitated.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A flow field data measuring device is characterized in that: the device comprises a control and drive system and a flow field test system; the control and drive system is used for sending a test signal to the flow field test system according to a test time sequence so as to start or stop different test tasks and collect test data; the flow field test system is used for executing different test tasks according to the test signals sent by the control and drive system;
preferably, the control and drive system comprises an upper computer, a synchronous controller, a signal generator, a signal collector and a shift measuring mechanism; the upper computer is provided with control software and is used for sending a test time sequence instruction to the synchronous controller; the synchronous controller sends a test trigger signal according to a test time sequence through a control signal generator, and starts or stops test tasks of different test equipment in the flow field test system in a combined or independent mode; the signal collector is used for collecting the test result of the flow field test system and storing the test result into the upper computer.
2. The flow field data measurement device of claim 1, wherein: the flow field test system comprises one or more of a pitot tube, a five-hole probe, a Particle Image Velocimetry (PIV) and a hot wire anemometer; preferably, the flow field test system comprises a pitot tube, a five-hole probe, a particle image velocimetry device and a hot-wire anemometer;
the pitot tube is fixed on the wall surface of the wind tunnel, and the testing position of the main flow outside the turbulent boundary layer is used for measuring the wind speed of the main flow; the five-hole probe is fixed on the wall surface of the wind tunnel, and the testing position of the main flow outside the turbulent flow boundary layer is used for measuring the deflection angle of the main flow; the PIV equipment comprises a PIV laser, a PIV camera and a tracing particle generator, the PIV laser and the PIV camera are arranged on the outer side of the wind tunnel, a laser plane is superposed with a focal plane of the camera, and the PIV equipment is used for measuring a two-dimensional velocity field; the hot wire anemometer is mounted on the mobile structure and used for measuring a single-point speed signal at the jet flow outlet and a single-point speed gradient signal at the downstream of the jet flow outlet.
3. The flow field data measuring device according to claim 1 or 2, wherein: the hot-wire anemometer comprises a single-wire hot-wire anemometer and an array double-wire hot-wire anemometer; the transfer mechanism comprises a first transfer mechanism and a second transfer mechanism; the monofilament hot wire anemometer is carried on the first moving and measuring mechanism, controllably moves back and forth in the vertical direction and is used for measuring a single-point speed signal at the jet flow outlet; the array twin-wire hot-wire anemometer is carried on the second moving and measuring mechanism, controllably moves back and forth in the horizontal direction, and is used for measuring single-point velocity gradient signals at the downstream of the jet flow outlet.
4. The flow field data measuring device according to any one of claims 1 to 3, wherein: the flow field data measuring device also comprises a mixing line, a loudspeaker and a flat plate; the stirring line is fixed on the flat plate, the stirring line and the flat plate are used for generating a turbulent boundary layer, and the zero-pressure gradient can be maintained in a flat plate test area by adjusting the tail of the flat plate; the loudspeaker and the single-wire hot-wire anemoscope are respectively arranged on two sides of the position of the flat jet hole, the loudspeaker is used for generating zero-mass jet flow, and the single-wire hot-wire anemoscope is used for measuring a single-point speed signal at the outlet of the jet flow.
5. A flow field data measuring method is characterized in that: measurement using the device according to any one of claims 1 to 4, comprising the steps of:
s1: installing a control and drive system and a flow field test system;
s2: carrying out calibration and calibration before experiment;
s3: starting the wind tunnel, operating control software on the upper computer after the wind tunnel runs stably, operating the upper computer to send a test time sequence instruction, communicating with the synchronous controller, so that the control signal generator sends a test trigger signal according to the test time sequence, starting or stopping test tasks of different test equipment in the flow field test system in a combined or independent mode, and after data is measured, acquiring a test result of the flow field test system by the signal acquisition unit and storing the test result in the upper computer;
s4: changing the test position according to the requirement of the test point position, and continuing to measure;
s5: after the measurement is completed, various data are analyzed.
6. The flow field data measurement method according to claim 5, wherein: the step of S1 includes: erecting a PIV camera and a PIV laser outside the wind tunnel to enable a laser plane to be superposed with a focal plane of the camera; fixing a pitot tube and a five-hole probe on the wall surface of the wind tunnel, and enabling a testing position to be positioned on the main flow outside a turbulent flow boundary layer; carrying a hot wire anemometer and a moving and measuring mechanism; preferably, the single-wire hot-wire anemometer is mounted on the first moving mechanism so as to be reciprocally controllably movable in the vertical direction, and the array twin-wire hot-wire anemometer is mounted on the second moving mechanism so as to be reciprocally controllably movable in the horizontal direction.
7. The flow field data measuring method according to claim 5 or 6, wherein: the step of S2 includes: setting an incoming flow speed; determining physical quantity and sampling parameters required to be acquired; drawing a test time sequence of joint or independent work of each test device of the constant flow field test system;
preferably, the physical quantity comprises one or more of a mainstream wind speed, a mainstream airflow deflection angle, a two-dimensional velocity field, a single point velocity signal at the jet outlet, and a single point velocity gradient signal downstream of the jet outlet; more preferably, the physical quantity comprises a main flow wind speed, a main flow deflection angle, a two-dimensional velocity field, a single-point velocity signal at the jet outlet, and a single-point velocity gradient signal downstream of the jet outlet;
preferably, the sampling parameters include a sampling frequency and a sampling time duration.
8. The flow field data measuring method according to any one of claims 5 to 7, wherein: the step of S3 includes: starting the wind tunnel, running control software on the upper computer after the wind tunnel runs stably, operating the upper computer to send a test time sequence instruction, and communicating with the synchronous controller; firstly, a synchronous controller regulates and controls a signal generator to jointly trigger a pitot tube and a five-hole probe, and monitors and measures the main flow wind speed and the air flow deflection angle; after the flow field is stable and meets the test requirements, triggering the single-wire hot-wire anemoscope, the double-wire hot-wire anemoscope and the PIV measurement system according to a planned time sequence to acquire data; the signal collector collects the test result of the flow field test system and stores the test result into the upper computer;
preferably, the single wire hot wire anemometer, the double wire hot wire anemometer and the PIV measuring system are triggered according to a planned time sequence, and the system comprises: triggering a loudspeaker and a monofilament hot wire anemometer, and monitoring and measuring a single-point speed signal at a jet flow outlet; after the single-wire hot-wire anemoscope detects the speed pulsation caused by the stable zero-mass jet flow, the downstream array double-wire hot-wire anemoscope is further triggered to work according to the upstream and downstream positions of the single-wire hot-wire anemoscope and the phase change of the loudspeaker signal, and the single-point speed gradient signal at the downstream of the jet flow outlet is monitored and measured; when the flow structure reaches the downstream laser plane formed by the PIV laser, the PIV device is further triggered to work, and a two-dimensional velocity field is measured.
9. The flow field data measuring method according to any one of claims 5 to 8, wherein: the step of S4 includes: triggering the first moving and measuring mechanism and/or the second moving and measuring mechanism according to the requirement of the test site, further moving the single-wire hot-wire anemometer and/or the array double-wire hot-wire anemometer, adjusting the positions of the PIV camera and the PIV laser, changing the test position, and continuing to measure;
preferably, according to the requirement of the test site, triggering a second moving mechanism, moving the array twin-wire hot-wire anemometer, adjusting the position of the PIV camera and the PIV laser, changing the test position, and continuing to measure.
10. A flow field data measurement control system is characterized in that: the control system is applied to the device according to any one of claims 1 to 4 or the method according to any one of claims 5 to 9, and comprises a mobile measuring mechanism control module, a signal generation module, a signal acquisition module and a data storage module; the movement control module of the movement mechanism controls the movement of the movement mechanism through the signal generator according to a first parameter set value; the signal generation module selects different trigger modes according to the test timing sequence instruction, communicates with the synchronous controller, regulates and controls the signal generator to trigger corresponding flow field test equipment, and measures the physical quantity of a flow field; the signal acquisition module acquires the measured physical quantity data of the corresponding flow field test equipment through the signal acquisition device according to the second parameter set value; the data storage module is used for storing data acquired by the signal acquisition unit;
preferably, the trigger mode comprises single channel trigger, multi-channel synchronous trigger and multi-channel asynchronous trigger; the single-channel triggering refers to triggering a single measuring device to collect data; the multichannel synchronous triggering refers to selecting a plurality of measuring instruments for synchronous triggering; the multichannel asynchronous triggering refers to selecting a plurality of measuring instruments to perform asynchronous triggering or sequentially performing triggering according to a planned test time sequence;
preferably, the first parameter setting value includes a target point coordinate and a moving speed; the second parameter setting value comprises a sampling frequency and a sampling time length.
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