CN111366296A - Steady-state pressure probe for reducing support rod interference by utilizing plasma jet - Google Patents
Steady-state pressure probe for reducing support rod interference by utilizing plasma jet Download PDFInfo
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- CN111366296A CN111366296A CN202010375541.8A CN202010375541A CN111366296A CN 111366296 A CN111366296 A CN 111366296A CN 202010375541 A CN202010375541 A CN 202010375541A CN 111366296 A CN111366296 A CN 111366296A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
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Abstract
The invention belongs to the technical field of flow field pressure testing, and particularly relates to a steady-state pressure probe for reducing support rod interference by utilizing plasma jet. The head of the probe is a steady-state pressure probe and is welded with the probe supporting rod; the pressure guiding pipe is packaged in the probe supporting rod, one end of the pressure guiding pipe is communicated with the pressure measuring hole at the head of the probe, and the other end of the pressure guiding pipe is led out from the tail of the probe supporting rod; the probe support rod comprises two mutually independent structures: a pressure leading pipe channel and a plasma generating cavity; the electrode is arranged in the plasma generation cavity, and the electrode lead-out cable is led out from the tail part of the probe supporting rod; the plasma generating cavity is provided with a plurality of non-communicated jet grooves in different height ranges, and the jet grooves are communicated with the downstream of the probe supporting rod. The probe of the invention can effectively weaken the blocking effect of the probe supporting rod and reduce the interference of the supporting rod on a measured flow field by generating plasma inside the supporting rod and controlling the trail of air flow passing through the supporting rod through air blowing and air suction.
Description
Technical Field
The invention belongs to the technical field of flow field pressure testing, and particularly relates to a steady-state pressure probe for reducing support rod interference by using plasma jet, which is suitable for measuring pressure in a subsonic steady-state flow field in an impeller machine.
Background
In the current flow field test, for example, in the subsonic steady-state flow field measurement between an inlet and an outlet of an impeller machine such as a fan, a gas compressor, a turbine and the like and between stages, parameters to be measured generally include total pressure, static pressure, mach number, airflow angle and the like, and a contact pressure probe is easy to realize and stable and reliable in measurement due to low price, and is an important means for obtaining the performance parameters and the flow field characteristics.
Because the contact pressure probe needs to be supported by the support rod when being inserted into a measured flow field for measurement, the flow field is interfered by the inevitable blocking effect of the support rod in the flow field, the flow mixing loss is increased, the performance of the component is reduced, and even the normal operation of the component is influenced. Especially when the pressure probe is measured in a small compressor, the clogging effect is more severe and even causes the occurrence of stall surge. In addition, the flow angle of the blade outlet of the impeller machine is different along the span direction, so that the inflow deflection angle of the probe support rod in different height directions is greatly changed in the actual measurement process, and therefore, complex three-dimensional unsteady trails can be generated behind the probe support rod, the trails can be propagated downstream along with the movement of the impeller machine, the disturbance on the flow field behind the support rod is serious, and even the upstream flow field can be influenced.
In the existing probe test technology, the following two improvement methods are generally used for solving the problem of influence of a probe strut on a flow field: one is to reduce the interference to the measured flow field by optimizing the structure and the size of the probe supporting rod, but the size of the probe supporting rod cannot be further reduced due to the limitation of the number and the structural strength of the pressure guiding pipes in the supporting rod; the other is to reduce the blocking effect and the interference to the measured flow field by arranging a round hole on the surface of the probe supporting rod and utilizing the action of the supporting rod on the outward blowing and the suction, but the scheme not only needs additional air supply, but also causes the structure to be complicated.
The problem of influence of the probe struts on the flow field restricts the deep research of researchers on the flow field in the impeller machine, and the requirement of accurately acquiring parameter information such as pressure, Mach number and the like in the flow field while generating interference on the measured flow field as little as possible is difficult to meet. Therefore, a pressure probe for effectively reducing the blocking effect of the strut is urgently needed, and is used for measuring the pressure in the subsonic steady-state flow field between the inlet, the outlet and the impeller stages of a subsonic air inlet channel, a fan, an air compressor, a turbine and the like in an impeller machine.
Disclosure of Invention
The invention provides a steady-state pressure probe for reducing the interference of a strut by using plasma jet, aiming at the problem that the strut of the probe can generate the interference and cause the blocking effect on a measured flow field when the existing pressure probe measures the parameters such as total pressure, static pressure, Mach number, airflow angle and the like of a subsonic steady-state flow field. Most importantly, the invention abandons the design thought of the traditional pressure probe supporting rod and the defect of low gas flow velocity induced by the traditional plasma generator, creatively applies the plasma to the design of the subsonic velocity probe supporting rod, and makes up the defects of the traditional steady-state pressure probe in the flow field measurement.
The technical scheme of the invention is as follows:
1. the utility model provides an utilize plasma jet to reduce steady state pressure probe that branch disturbed, by probe branch (1), probe head (2), jet groove (3), draw and press pipe (4), draw and press pipe passageway (5), plasma generation chamber (6), electrode (7), tip thermal insulation insulating layer (8), lateral wall thermal insulation insulating layer (9), electrode extraction cable (10) are constituteed, its characterized in that: the probe head (2) is a stable pressure probe and is welded with the probe support rod (1); the pressure guiding pipe (4) is packaged in the probe supporting rod (1), one end of the pressure guiding pipe is communicated with the pressure measuring hole of the probe head part (2), and the other end of the pressure guiding pipe is led out from the tail part of the probe supporting rod (1); the probe support rod (1) comprises two mutually independent structures: a pressure leading pipe passage (5) and a plasma generating cavity (6); the electrode (7) is arranged in the plasma generation cavity (6), and the electrode lead-out cable (9) is led out from the tail part of the probe supporting rod (1); the plasma generating cavity (6) is provided with a plurality of jet flow grooves (3) which are not communicated with each other in different height ranges and are communicated with the downstream of the probe supporting rod (1).
2. Furthermore, the diameter of the probe head (2) is 2 mm-8 mm, the length is 5 mm-45 mm, and the probe head can be a pressure probe with single hole, three holes, four holes, five holes, seven holes and the like.
3. Furthermore, the probe supporting rod (1) is cylindrical, and the diameter of the probe supporting rod is 3-16 mm.
4. Furthermore, the inner wall of the plasma generation cavity (6) is cylindrical, the diameter of the cross section is 2-6 mm, and the distance between the circle center of the plasma generation cavity and the circle center of the probe supporting rod (1) is 2-4 mm; the distance between the lower end of the plasma generating cavity (6) and the top end of the probe supporting rod (1) is 0.1-2 mm, and the height is determined according to the depth of the probe extending into a measured flow field.
5. Furthermore, in different height ranges of the probe supporting rod (1), the exhaust direction of the jet flow groove (3) is consistent with the average incoming flow direction of the height range; in the same height range of the probe supporting rod (1), the number of the jet flow grooves (3) is 1 or 3, and the variation range of the incoming flow deflection angle is-15 degrees; the width of the jet flow groove (3) is 0.1 mm-3 mm, and the length is determined according to the variation range of the incoming flow deflection angle.
6. Furthermore, in the plasma generating cavity (6), the upper end and the lower end of the electrode (7) are fixed by an end heat insulation layer (8) to play the roles of heat insulation, sealing and fixation; and the probe supporting rod (1) is separated by a side wall heat insulation layer (9) to play a role in heat insulation and insulation.
7. Furthermore, the diameter of the electrodes (7) is 0.5 mm-1.5 mm, the distance is 0.2 mm-1 mm, and the materials of the electrodes (7) are cerium-tungsten alloy, titanium alloy or stainless steel.
8. Furthermore, the power supply required by the plasma can be a millisecond pulse power supply or a nanosecond pulse power supply, the pulse width output by the power supply is 5 ns-20000 ns, the frequency is 0.1 kHz-50 kHz, the voltage is 2 kV-30 kV, and the maximum pulse energy is 30 mJ.
9. Further, calibrating the probe through a calibration wind tunnel to obtain the aerodynamic calibration coefficients of the probe in different incoming flow directions and different Mach numbers, and determining parameter conditions such as pulse width, voltage and the like of a power supply required by plasma generation under the conditions of known incoming flow pressure, direction and Mach number; in actual measurement, the total pressure, the static pressure, the Mach number and the airflow angle of a measured flow field are calculated by utilizing the probe pneumatic calibration coefficients of different incoming flow directions and different Mach numbers obtained by calibrating the wind tunnel, the parameter conditions of pulse width, voltage and the like of a power supply required by plasma generation are set according to the obtained total pressure, static pressure, Mach number and airflow angle, the generation amount and the jet flow of the plasma are controlled, and the jet flow groove (3) generates blowing and suction actions around the probe support rod (1) to control the trail of the airflow passing through the support rod (1), so that the blocking effect of the probe support rod (1) can be effectively weakened, and the interference of the probe support rod (1) on the measured flow field is reduced.
The invention has the beneficial effects that:
compared with the existing subsonic steady-state flow field pressure probe, the steady-state pressure probe for reducing the interference of the support rod by using the plasma jet can achieve the following beneficial effects:
the beneficial effects are that: according to the invention, through generating plasma in the plasma generating cavity in the support rod and combining the difference of the airflow angles at the outlets of different blade heights of the blades, jet flow grooves with different directions are arranged in the range of different heights of the probe support rod, and the wake of the airflow passing through the support rod is controlled through the blowing and suction effects generated by the plasma generator during working, so that the interference on the measured flow field and the blocking effect of the probe support rod can be effectively reduced.
The beneficial effects are that: the generation of the plasma is realized by controlling the voltage and the frequency of the electrode, and the power supply can be regulated according to the incoming flow speed of the measured flow field, so that the generation of the plasma is controlled, and the optimal control effect on the fluid around the probe supporting rod is achieved. Compared with other control methods, the plasma jet does not need additional moving parts and gas source pipelines, and is a zero-mass control mode with light mass, quick response and simple structure.
The beneficial effects are three: the induction speed generated by the traditional plasma is not more than 10m/s, and the plasma generator can not be applied to the active control of subsonic airflow.
Drawings
Fig. 1 is a schematic structural diagram of a steady-state pressure probe for reducing strut interference using a plasma jet according to an embodiment of the present invention.
FIG. 2 is a left side view of FIG. 1
Fig. 3 is a partially enlarged view of fig. 1.
Fig. 4 is a sectional view taken along line a-a of fig. 1.
Fig. 5 is a sectional view taken along line B-B of fig. 1.
Fig. 6 is a view in the direction C of fig. 1.
Fig. 7 is a schematic structural diagram of a steady-state pressure probe for reducing strut interference using a plasma jet according to a second embodiment of the present invention.
FIG. 8 is a left side view of FIG. 7
Fig. 9 is a cross-sectional view of fig. 7.
Fig. 10 is a view from direction B of fig. 7.
Wherein: 1-probe supporting rod, 2-probe head, 3-jet flow groove, 4-pressure leading pipe, 5-pressure leading pipe channel, 6-plasma generating cavity, 7-electrode, 8-end heat insulation layer, 9-side wall heat insulation layer and 10-electrode leading-out cable.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
The first embodiment is as follows:
for the measurement of the compressor interstage three-dimensional flow field, the measurement space is narrow, the incoming flow three-dimensional performance is strong, and in order to ensure the spatial resolution, a smaller probe size is selected to ensure the fine measurement, so the following implementation mode can be adopted:
fig. 1-6 show a steady-state pressure probe for reducing strut interference using plasma jet according to the present invention. By probe branch (1), probe head (2), jet current groove (3), draw and press pipe (4), draw and press pipe passageway (5), plasma generation chamber (6), electrode (7), tip heat insulation insulating layer (8), lateral wall heat insulation insulating layer (9), electrode lead out cable (10) and constitute, its characterized in that: the probe head (2) is a stable pressure probe and is welded with the probe support rod (1); the pressure guiding pipe (4) is packaged in the probe supporting rod (1), one end of the pressure guiding pipe is communicated with the pressure measuring hole of the probe head part (2), and the other end of the pressure guiding pipe is led out from the tail part of the probe supporting rod (1); the probe support rod (1) comprises two mutually independent structures: a pressure leading pipe passage (5) and a plasma generating cavity (6); the electrode (7) is arranged in the plasma generation cavity (6), and the electrode lead-out cable (9) is led out from the tail part of the probe supporting rod (1); the plasma generating cavity (6) is provided with a plurality of jet flow grooves (3) which are not communicated with each other in different height ranges and are communicated with the downstream of the probe supporting rod (1).
In the embodiment, the probe head (2) is a ball-and-socket five-hole pressure probe, the diameter is 5 mm, and the length is 18 mm.
The probe support rod (1) is cylindrical and has a diameter of 10 mm.
The inner wall of the plasma generation cavity (6) is cylindrical, the diameter of the cross section is 4 mm, and the distance between the circle center of the plasma generation cavity and the circle center of the probe supporting rod (1) is 2.5 mm; the distance between the lower end of the plasma generating cavity (6) and the top end of the probe supporting rod (1) is 2 mm.
In different height ranges of the probe supporting rod (1), the exhaust direction of each jet flow groove (3) is consistent with the average incoming flow direction of the height range; in the same height range of the probe supporting rod (1), the number of the jet flow grooves (3) is 1, and the variation range of the incoming flow deflection angle is-10 degrees to 10 degrees; the width of the jet flow groove (3) is 0.6 mm.
In the plasma generating cavity (6), the upper end and the lower end of an electrode (7) are fixed by an end heat insulation layer (8) to play roles of heat insulation, sealing and fixation; and the probe supporting rod (1) is separated by a side wall heat insulation layer (9) to play a role in heat insulation and insulation.
The diameter of the electrodes (7) is 0.8 mm, the distance is 0.5 mm, and the materials of the electrodes (7) are cerium-tungsten alloy, titanium alloy or stainless steel.
The power supply required by the plasma is a nanosecond pulse power supply, the pulse width output by the power supply is 20ns, the frequency is 1kHz, the voltage is 15.5kV, and the pulse energy is 6 mJ.
Calibrating the probe through a calibration wind tunnel to obtain the aerodynamic calibration coefficients of the probe in different incoming flow directions and different Mach numbers, and determining parameter conditions such as pulse width, voltage and the like of a power supply required by plasma generation under the conditions of known incoming flow pressure, direction and Mach number; in actual measurement, the total pressure, the static pressure, the Mach number, the airflow deflection angle and the airflow pitch angle of a measured flow field are calculated by utilizing the probe pneumatic calibration coefficients obtained by calibrating the wind tunnel in different incoming flow directions and different Mach numbers, the total pressure, the static pressure, the Mach number, the airflow deflection angle and the airflow pitch angle are obtained according to the total pressure, the static pressure, the Mach number, the airflow deflection angle and the airflow pitch angle, parameter conditions such as pulse width, voltage and the like of a power supply required by plasma generation are set, the generation amount and the jet flow of the plasma are controlled, and the trail of airflow passing through the strut (1) is controlled by blowing and sucking actions generated around the probe strut (1) through the jet flow groove (3), so that the blocking effect of the probe strut (1) can be effectively weakened, and the.
Example two:
for the measurement of the two-dimensional flow field at the outlet of the turbine, in order to ensure the strength and rigidity of the strut, a larger probe size is selected, so that the following embodiments can be adopted:
fig. 7-10 show a steady-state pressure probe for reducing strut interference using plasma jet according to the present invention. By probe branch (1), probe head (2), jet current groove (3), draw and press pipe (4), draw and press pipe passageway (5), plasma generation chamber (6), electrode (7), tip heat insulation insulating layer (8), lateral wall heat insulation insulating layer (9), electrode lead out cable (10) and constitute, its characterized in that: the probe head (2) is a stable pressure probe and is welded with the probe support rod (1); the pressure guiding pipe (4) is packaged in the probe supporting rod (1), one end of the pressure guiding pipe is communicated with the pressure measuring hole of the probe head part (2), and the other end of the pressure guiding pipe is led out from the tail part of the probe supporting rod (1); the probe support rod (1) comprises two mutually independent structures: a pressure leading pipe passage (5) and a plasma generating cavity (6); the electrode (7) is arranged in the plasma generation cavity (6), and the electrode lead-out cable (9) is led out from the tail part of the probe supporting rod (1); the plasma generating cavity (6) is provided with a plurality of jet flow grooves (3) which are not communicated with each other in different height ranges and are communicated with the downstream of the probe supporting rod (1).
In this embodiment, the probe head (2) is a three-hole pressure probe with a diameter of 6 mm and a length of 25 mm.
The probe support rod (1) is cylindrical and 12 mm in diameter.
The inner wall of the plasma generation cavity (6) is cylindrical, the diameter of the cross section is 5 mm, and the distance between the circle center of the plasma generation cavity and the circle center of the probe supporting rod (1) is 3.5 mm; the distance between the lower end of the plasma generating cavity (6) and the top end of the probe supporting rod (1) is 2 mm.
In different height ranges of the probe supporting rod (1), the exhaust direction of each jet flow groove (3) is consistent with the average incoming flow direction of the height range; in the same height range of the probe supporting rod (1), the number of the jet flow grooves (3) is 3, and the variation range of the incoming flow deflection angle is-15 degrees; the width of the jet flow groove (3) is 0.3 mm.
In the plasma generating cavity (6), the upper end and the lower end of an electrode (7) are fixed by an end heat insulation layer (8) to play roles of heat insulation, sealing and fixation; and the probe supporting rod (1) is separated by a side wall heat insulation layer (9) to play a role in heat insulation and insulation.
The diameter of the electrodes (7) is 1 mm, the distance is 0.7 mm, and the materials of the electrodes (7) are cerium-tungsten alloy, titanium alloy or stainless steel.
The power supply required by the plasma is a nanosecond pulse power supply, the pulse width output by the power supply is 15ns, the frequency is 2kHz, the voltage is 17kV, and the pulse energy is 10 mJ.
Calibrating the probe through a calibration wind tunnel to obtain the aerodynamic calibration coefficients of the probe in different incoming flow directions and different Mach numbers, and determining parameter conditions such as pulse width, voltage and the like of a power supply required by plasma generation under the conditions of known incoming flow pressure, direction and Mach number; in actual measurement, the total pressure, the static pressure, the Mach number and the airflow deflection angle of a measured flow field are calculated by utilizing the probe pneumatic calibration coefficients obtained by calibrating the wind tunnel in different incoming flow directions and different Mach numbers, the parameter conditions of pulse width, voltage and the like of a power supply required by plasma generation are set according to the obtained total pressure, static pressure, Mach number and airflow deflection angle, the generation amount and the jet flow of the plasma are controlled, and the jet flow groove (3) generates blowing and suction actions around the probe support rod (1) to control the trail of the airflow after passing through the support rod (1), so that the blocking effect of the probe support rod (1) can be effectively weakened, and the interference of the probe support rod (1) on the measured flow field is reduced.
Claims (1)
1. The utility model provides an utilize plasma jet to reduce steady state pressure probe that branch disturbed, by probe branch (1), probe head (2), jet groove (3), draw and press pipe (4), draw and press pipe passageway (5), plasma generation chamber (6), electrode (7), tip thermal insulation insulating layer (8), lateral wall thermal insulation insulating layer (9), electrode extraction cable (10) are constituteed, its characterized in that: the probe head (2) is a stable pressure probe and is welded with the probe support rod (1); the pressure guiding pipe (4) is packaged in the probe supporting rod (1), one end of the pressure guiding pipe is communicated with the pressure measuring hole of the probe head part (2), and the other end of the pressure guiding pipe is led out from the tail part of the probe supporting rod (1); the probe support rod (1) comprises two mutually independent structures: a pressure leading pipe passage (5) and a plasma generating cavity (6); the electrode (7) is arranged in the plasma generation cavity (6), and the electrode lead-out cable (9) is led out from the tail part of the probe supporting rod (1); the plasma generating cavity (6) is provided with a plurality of jet flow grooves (3) which are not communicated with each other in different height ranges and are communicated with the downstream of the probe supporting rod (1);
the diameter of the probe head (2) is 2 mm-8 mm, the length is 5 mm-45 mm, and the probe head can be a pressure probe with single hole, three holes, four holes, five holes, seven holes and the like;
the probe supporting rod (1) is cylindrical, and the diameter of the probe supporting rod is 3-16 mm;
the inner wall of the plasma generation cavity (6) is cylindrical, the diameter of the cross section is 2-6 mm, and the distance between the circle center of the plasma generation cavity and the circle center of the probe supporting rod (1) is 2-4 mm; the distance between the lower end of the plasma generating cavity (6) and the top end of the probe supporting rod (1) is 0.1-2 mm, and the height is determined according to the depth of the probe extending into a measured flow field;
in different height ranges of the probe supporting rod (1), the exhaust direction of each jet flow groove (3) is consistent with the average incoming flow direction of the height range; in the same height range of the probe supporting rod (1), the number of the jet flow grooves (3) is 1 or 3, and the variation range of the incoming flow deflection angle is-15 degrees; the width of the jet flow groove (3) is 0.1 mm-3 mm, and the length is determined according to the variation range of the incoming flow deflection angle;
in the plasma generating cavity (6), the upper end and the lower end of an electrode (7) are fixed by an end heat insulation layer (8) to play roles of heat insulation, sealing and fixation; the probe supporting rod (1) is separated by a side wall heat insulation layer (9) to play a role in heat insulation and insulation;
the diameter of the electrodes (7) is 0.5 mm-1.5 mm, the distance is 0.2 mm-1 mm, and the materials of the electrodes (7) are cerium-tungsten alloy, titanium alloy or stainless steel;
the power supply required by the plasma can be a millisecond pulse power supply or a nanosecond pulse power supply, the pulse width output by the power supply is 5 ns-20000 ns, the frequency is 0.1 kHz-50 kHz, the voltage is 2 kV-30 kV, and the maximum pulse energy is 30 mJ;
calibrating the probe through a calibration wind tunnel to obtain the aerodynamic calibration coefficients of the probe in different incoming flow directions and different Mach numbers, and determining parameter conditions such as pulse width, voltage and the like of a power supply required by plasma generation under the conditions of known incoming flow pressure, direction and Mach number; in actual measurement, the total pressure, the static pressure, the Mach number and the airflow angle of a measured flow field are calculated by utilizing the probe pneumatic calibration coefficients of different incoming flow directions and different Mach numbers obtained by calibrating the wind tunnel, the parameter conditions of pulse width, voltage and the like of a power supply required by plasma generation are set according to the obtained total pressure, static pressure, Mach number and airflow angle, the generation amount and the jet flow of the plasma are controlled, and the jet flow groove (3) generates blowing and suction actions around the probe support rod (1) to control the trail of the airflow passing through the support rod (1), so that the blocking effect of the probe support rod (1) can be effectively weakened, and the interference of the probe support rod (1) on the measured flow field is reduced.
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