CN212458769U - Steady-state pressure probe comb for reducing support rod interference by utilizing plasma jet - Google Patents
Steady-state pressure probe comb for reducing support rod interference by utilizing plasma jet Download PDFInfo
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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 comb for reducing support rod interference by utilizing plasma jet. The probe head comprises a plurality of stable pressure probes which are welded with the probe comb support rods; the pressure guide pipe is packaged in the probe comb support rod and the mounting seat, one end of the pressure guide pipe is communicated with the pressure measuring hole at the head of the probe, and the other end of the pressure guide pipe is led out from the tail of the mounting seat; probe comb branch and mount pad welding, its inside a plurality of mutually independent structures that contain: 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 mounting seat; the plasma generating cavity is provided with a jet flow groove which is communicated with the lower part of the probe comb supporting rod. The probe comb can effectively weaken the blocking effect of the probe comb 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 tail of air flow passing through the supporting rod through the blowing and sucking actions generated when the plasma generator works.
Description
Technical Field
The invention belongs to the technical field of flow field pressure testing, and particularly relates to a steady-state pressure probe comb for reducing support rod interference by using plasma jet, which is suitable for measuring multi-point pressure along the height direction of a blade in a subsonic steady-state flow field in an impeller machine.
Background
In subsonic steady-state flow field measurement of inlet and outlet and interstage of turbomachinery such as fan, compressor, turbine, it usually adopts contact pressure measurement device to obtain flow field parameters such as total pressure, static pressure, Mach number, airflow angle, etc. The pressure measuring device has a single-point pressure probe and a multi-point pressure probe comb.
The multipoint pressure probe comb is generally composed of 3-5 three-hole, four-hole or five-hole pressure probes, the probes need to be supported by a support rod and are inserted into a measured flow field for measurement, and the support rod inevitably interferes with the flow field due to the blocking effect caused in the flow field, so that the flow mixing loss is increased, the performance of components is reduced, and even the normal operation of the components is influenced. Especially when the probe comb is measured in a small-sized compressor, the clogging effect is more serious and even causes the occurrence of stall surge. When the probe comb support rod is used for measuring in a measured flow field with high flow velocity, the probe comb support rod not only can change the airflow parameters nearby the probe comb support rod, but also can generate obvious three-dimensional unsteady trails behind the support rod, and the trails can be propagated downstream along with the movement of the impeller machine, and even can influence the upstream flow field.
The problem of influence of the probe comb support on the flow field is generally solved by the following two improvement methods: one is that the interference to the measured flow field is reduced by optimizing the structure and the size of the supporting rod, but the size of the probe comb 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 blockage effect of the supporting rod and the interference to the measured flow field by arranging round holes on the surface of the supporting rod and utilizing an active control method of blowing and sucking, but the scheme not only needs additional air supply, but also has a complex structure.
The problem of influence of the probe comb support rods on the flow field restricts the deep research of researchers on the flow field in the impeller machine, and the requirement that parameter information such as pressure, Mach number and the like in the flow field is accurately obtained while the interference on the measured flow field is as small as possible is difficult to meet. Therefore, a steady-state pressure probe comb for reducing the interference of the strut by using plasma jet is urgently needed, and is used for measuring multi-point pressure in the subsonic steady-state flow field of the inlet, the outlet and the interstage of a fan, a gas compressor, a turbine and the like in impeller machinery.
Disclosure of Invention
Aiming at the problem that the support rod of the existing pressure probe comb can generate interference and cause blocking effect on a measured flow field when the parameters such as total pressure, static pressure, Mach number, airflow angle and the like of a subsonic steady-state flow field are measured, the invention provides the steady-state pressure probe comb for reducing the support rod interference by utilizing plasma jet. Most importantly, the invention abandons the design thought of the traditional pressure probe comb support rod and the defect of low air flow velocity induced by the traditional plasma generator, creatively applies the plasma to the design of the subsonic velocity probe comb support rod, and makes up the defects of the traditional steady-state pressure probe comb during flow field measurement.
The technical scheme of the invention is as follows:
1. a steady state pressure probe comb for reducing strut interference with plasma jet, comprising: the probe consists of a probe comb support rod (1), a probe head (2), a mounting seat (3), a jet flow groove (4), a pressure guiding pipe (5), a pressure guiding pipe channel (6), a plasma generation cavity (7), an electrode (8), an end heat insulation layer (9), a side wall heat insulation layer (10) and an electrode lead-out cable (11), wherein the probe head (2) comprises a plurality of stable pressure probes and is welded with the probe comb support rod (1); the pressure guide pipe (5) is packaged in the probe comb support rod (1) and the mounting seat (3), one end of the pressure guide pipe is communicated with a pressure measuring hole of the probe head (2), and the other end of the pressure guide pipe is led out from the tail of the mounting seat (3); probe comb branch (1) and mount pad (3) welding, its inside contains a plurality of mutually independent structures: a pressure leading pipe channel (6) and a plasma generating cavity (7); the electrode (8) is arranged in the plasma generation cavity (7), and the electrode lead-out cable (11) is led out from the tail part of the mounting seat (3); the plasma generating cavity (7) is provided with a jet flow groove (4) which is communicated with the downstream of the probe comb support rod (1).
2. Furthermore, the length of the probe head (2) is 2-20 mm, the probe head can be a pressure probe with single hole, three holes, four holes, five holes, seven holes and the like, and the number of the probes is 3-5.
3. Furthermore, the section of the probe comb support rod (1) is waist-shaped, the diameter of the front and rear semi-circles is 3-20 mm, the distance between the centers of the circles is 2-16 mm, and the length of the probe comb support rod is determined according to different measuring environments.
4. Furthermore, the inner wall of the plasma generation cavity (7) is cylindrical, the axis of the plasma generation cavity is parallel to the axis of the rear half circle of the probe comb support rod (1), the upper end of the plasma generation cavity is flush with the bottom surface of the mounting seat (3), the distance between the lower end of the plasma generation cavity and the top end of the probe comb support rod (1) is 0.1-2 mm, and the diameter of the cross section is 2-6 mm;
5. furthermore, the number of the plasma generating cavities (7) is 1-3; when the number of the plasma generating cavities (7) is 1, the distance between the circle center of the section of each plasma generating cavity and the circle center of the rear semicircle of the probe comb supporting rod (1) is 0-5 mm; when the number of the plasma generating cavities (7) is 2, the centers of the cross sections of the two plasma generating cavities (7) are symmetrically distributed, the included angle between the center of the cross section of the two plasma generating cavities and the center of the rear half circle of the probe comb supporting rod (1) is 90-180 degrees, the distance between the center of the cross section of the rear half circle of the probe comb supporting rod and the center of the rear half circle of the probe comb supporting rod (1) is 2-5 mm, and the two plasma generating; when the number of the plasma generating cavities (7) is 3, the centers of the cross sections of the three plasma generating cavities (7) are distributed annularly, the center of the ring is the center of the rear semicircle of the probe comb supporting rod (1), the radius of the ring is 2-5 mm, the central angle of the centers of the two plasma generating cavities (7) on the ring is 100-150 degrees, and the three plasma generating cavities (7) can synchronously work and also can alternately work.
6. Further, the exhaust direction of the jet flow groove (4) is parallel to the main flow direction; the width of the outlet of the jet flow groove (4) is 0.1 mm-4 mm, and the length is the same as the height of the plasma generation cavity (7).
7. Furthermore, the upper end and the lower end of the electrode (8) are fixed in the plasma generating cavity (7) by an end heat insulation layer (9) to play the roles of heat insulation, sealing and fixation; and the probe comb support rod (1) is separated by a side wall heat insulation layer (10) to play a role in heat insulation and insulation.
8. Furthermore, the diameter of the electrodes (8) is 0.5 mm-1.5 mm, the distance is 0.2 mm-1 mm, and the materials are cerium-tungsten alloy, titanium alloy or stainless steel and the like.
9. Furthermore, the power supply required by the electrode (8) 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.
10. Further, calibrating the probe comb through a calibration wind tunnel to obtain the pneumatic calibration coefficients of the probe comb in different incoming flow directions and different Mach numbers, and determining the parameter conditions such as voltage 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 comb pneumatic calibration coefficients of different incoming flow directions and different Mach numbers obtained by calibrating the wind tunnel, the voltage and other parameter conditions 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, the trail of the airflow passing through the probe comb supporting rod (1) is controlled through the blowing and suction effects generated by the jet flow groove (4) when the plasma generator works, the blocking effect of the probe comb supporting rod (1) can be effectively weakened, and the interference of the probe comb supporting 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 comb, the steady-state pressure probe comb 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, plasmas are generated in the plurality of plasma generating cavities in the support rod, and the trailing path of the airflow passing through the support rod is controlled through the blowing and suction effects generated when the plasma generator works, so that the interference on a measured flow field and the blocking effect of the probe combing support rod are 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 and controlled according to the incoming flow speed of the measured flow field, so that the generation of the plasma is controlled, different plasma generators can work simultaneously or alternatively, and the optimal control effect on the fluid around the probe comb support 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 active control of subsonic airflow.
Drawings
FIG. 1 is a schematic structural diagram of a steady-state pressure probe comb for reducing strut interference using plasma jet in accordance with one 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 cross-sectional view of fig. 1.
Fig. 5 is a view from direction B of fig. 1.
FIG. 6 is a schematic structural diagram of a steady-state pressure probe comb for reducing strut interference by using plasma jet in the second embodiment of the present invention.
FIG. 7 is a left side view of FIG. 6
Fig. 8 is a cross-sectional view of fig. 6.
Fig. 9 is a view from direction B of fig. 6.
Wherein: 1-probe comb support rod, 2-probe head, 3-mounting seat, 4-jet flow groove, 5-pressure leading pipe, 6-pressure leading pipe channel, 7-plasma generating cavity, 8-electrode, 9-end heat insulation layer, 10-side wall heat insulation layer and 11-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 three-dimensional flow field between the turbine stages, the measurement space is narrow, the incoming flow three-dimensional performance is strong, and in order to ensure the spatial resolution, a smaller probe comb size should be selected to ensure the fine measurement, so the following implementation mode can be adopted:
as shown in FIGS. 1-5, a steady-state pressure probe comb for reducing strut interference by using plasma jet is disclosed. The probe consists of a probe comb support rod (1), a probe head (2), a mounting seat (3), a jet flow groove (4), a pressure guiding pipe (5), a pressure guiding pipe channel (6), a plasma generation cavity (7), an electrode (8), an end heat insulation layer (9), a side wall heat insulation layer (10) and an electrode lead-out cable (11), wherein the probe head (2) comprises a plurality of stable pressure probes and is welded with the probe comb support rod (1); the pressure guide pipe (5) is packaged in the probe comb support rod (1) and the mounting seat (3), one end of the pressure guide pipe is communicated with a pressure measuring hole of the probe head (2), and the other end of the pressure guide pipe is led out from the tail of the mounting seat (3); probe comb branch (1) and mount pad (3) welding, its inside contains a plurality of mutually independent structures: a pressure leading pipe channel (6) and a plasma generating cavity (7); the electrode (8) is arranged in the plasma generation cavity (7), and the electrode lead-out cable (11) is led out from the tail part of the mounting seat (3); the plasma generating cavity (7) is provided with a jet flow groove (4) which is communicated with the downstream of the probe comb support rod (1).
In this embodiment, the probe head (2) is cylindrical, has a diameter of 3 mm and a length of 8 mm, and is provided with five pressure probes.
The section of the probe comb support rod (1) is waist-shaped, the diameter of the front half circle and the rear half circle is 8 mm, the distance between the centers of the circles is 8 mm, and the length of the probe comb support rod is 50 mm.
The inner wall of the plasma generation cavity (7) is cylindrical, the axis of the plasma generation cavity is parallel to the axis of the rear semicircle of the probe comb supporting rod (1), the upper end of the plasma generation cavity is flush with the bottom surface of the mounting seat (3), the distance between the lower end of the plasma generation cavity and the top end of the probe comb supporting rod (1) is 1.5 mm, and the diameter of the cross section of the plasma generation cavity is 3 mm;
the number of the plasma generating cavities (7) is 3; the centers of the cross sections of the three plasma generating cavities (7) are distributed annularly, the center of the circular ring is the center of the rear semicircle of the probe comb support rod (1), the radius of the circular ring is 2.2 mm, the central angle of the centers of the two plasma generating cavities (7) on the circular ring is 120 degrees, and the three plasma generating cavities (7) work alternately.
The exhaust direction of the jet flow groove (4) is parallel to the main flow direction; the width of the outlet of the jet flow groove (4) is 0.3 mm, and the length of the jet flow groove is the same as the height of the plasma generation cavity (7).
The upper end and the lower end of the electrode (8) are fixed in the plasma generating cavity (7) by an end heat insulation layer (9) to play roles of heat insulation, sealing and fixation; and the probe comb support rod (1) is separated by a side wall heat insulation layer (10) to play a role in heat insulation and insulation.
The diameter of the electrodes (8) is 0.5 mm, the distance is 0.8 mm, and the material is cerium-tungsten alloy.
The power supply required by the electrode (8) is a nanosecond pulse power supply, the pulse width output by the power supply is 20ns, the frequency is 1kHz, the voltage is 15.3kV, and the pulse energy is 6 mJ.
Calibrating the probe comb through a calibration wind tunnel to obtain the pneumatic calibration coefficients of the probe comb in different incoming flow directions and different Mach numbers, and determining the voltage and other parameter conditions 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 comb 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, the voltage and other parameter conditions 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 the airflow passing through the probe comb supporting rod (1) is controlled through the blowing and suction effects generated by the jet flow groove (4) when the plasma generator works, so that the blocking effect of the probe comb supporting rod (1) can be effectively weakened, and.
Example two:
in order to obtain parameters of a two-dimensional flow field such as total pressure and static pressure of a turbine outlet, the following embodiments are adopted:
as shown in FIGS. 6-9, a steady-state pressure probe comb for reducing strut interference by using plasma jet is disclosed. The probe consists of a probe comb support rod (1), a probe head (2), a mounting seat (3), a jet flow groove (4), a pressure guiding pipe (5), a pressure guiding pipe channel (6), a plasma generation cavity (7), an electrode (8), an end heat insulation layer (9), a side wall heat insulation layer (10) and an electrode lead-out cable (11), wherein the probe head (2) comprises a plurality of stable pressure probes and is welded with the probe comb support rod (1); the pressure guide pipe (5) is packaged in the probe comb support rod (1) and the mounting seat (3), one end of the pressure guide pipe is communicated with a pressure measuring hole of the probe head (2), and the other end of the pressure guide pipe is led out from the tail of the mounting seat (3); probe comb branch (1) and mount pad (3) welding, its inside contains a plurality of mutually independent structures: a pressure leading pipe channel (6) and a plasma generating cavity (7); the electrode (8) is arranged in the plasma generation cavity (7), and the electrode lead-out cable (11) is led out from the tail part of the mounting seat (3); the plasma generating cavity (7) is provided with a jet flow groove (4) which is communicated with the downstream of the probe comb support rod (1).
In the embodiment, the probe head (2) is a flat trapezoid body with the length of 6 mm, and five three-hole pressure probes are arranged.
The section of the probe comb support rod (1) is waist-shaped, the diameter of the front and rear semi-circles is 10 mm, the distance between the centers of the circles is 6 mm, and the length of the probe comb support rod is 80 mm.
The inner wall of the plasma generation cavity (7) is cylindrical, the axis of the plasma generation cavity is parallel to the axis of the rear semicircle of the probe comb supporting rod (1), the upper end of the plasma generation cavity is flush with the bottom surface of the mounting seat (3), the distance between the lower end of the plasma generation cavity and the top end of the probe comb supporting rod (1) is 1.5 mm, and the diameter of the cross section is 4 mm;
the number of the plasma generating cavities (7) is 2; the centers of the cross sections of the two plasma generating cavities (7) are symmetrically distributed, the included angle between the center of the cross section of the two plasma generating cavities and the center of the back half circle of the probe comb supporting rod (1) is 136 degrees, the distance between the center of the cross section of the two plasma generating cavities and the center of the back half circle of the probe comb supporting rod (1) is 2.7 millimeters, and the two plasma generating.
The exhaust direction of the jet flow groove (4) is parallel to the main flow direction; the width of the outlet of the jet flow groove (4) is 0.5 mm, and the length of the jet flow groove is the same as the height of the plasma generation cavity (7).
The upper end and the lower end of the electrode (8) are fixed in the plasma generating cavity (7) by an end heat insulation layer (9) to play roles of heat insulation, sealing and fixation; and the probe comb support rod (1) is separated by a side wall heat insulation layer (10) to play a role in heat insulation and insulation.
The diameter of the electrodes (8) is 0.7 mm, the distance is 0.1 mm, and the material is cerium-tungsten alloy.
The power supply required by the electrode (8) is a nanosecond pulse power supply, the pulse width output by the power supply is 15ns, the frequency is 1.7kHz, the voltage is 15.7kV, and the pulse energy is 9 mJ.
Calibrating the probe comb through a calibration wind tunnel to obtain the pneumatic calibration coefficients of the probe comb in different incoming flow directions and different Mach numbers, and determining the voltage and other parameter conditions 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 comb pneumatic calibration coefficients obtained by calibrating the wind tunnel in different incoming flow directions and different Mach numbers, the voltage and other parameter conditions 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, the trail of the airflow passing through the probe comb supporting rod (1) is controlled through the blowing and suction effects generated by the jet flow groove (4) when the plasma generator works, the blocking effect of the probe comb supporting rod (1) can be effectively weakened, and the interference of the probe comb supporting rod (1) on the measured flow field is reduced.
Claims (1)
1. A steady state pressure probe comb for reducing strut interference with plasma jet, comprising: the probe consists of a probe comb support rod (1), a probe head (2), a mounting seat (3), a jet flow groove (4), a pressure guiding pipe (5), a pressure guiding pipe channel (6), a plasma generation cavity (7), an electrode (8), an end heat insulation layer (9), a side wall heat insulation layer (10) and an electrode lead-out cable (11), wherein the probe head (2) comprises a plurality of stable pressure probes and is welded with the probe comb support rod (1); the pressure guide pipe (5) is packaged in the probe comb support rod (1) and the mounting seat (3), one end of the pressure guide pipe is communicated with a pressure measuring hole of the probe head (2), and the other end of the pressure guide pipe is led out from the tail of the mounting seat (3); probe comb branch (1) and mount pad (3) welding, its inside contains a plurality of mutually independent structures: a pressure leading pipe channel (6) and a plasma generating cavity (7); the electrode (8) is arranged in the plasma generation cavity (7), and the electrode lead-out cable (11) is led out from the tail part of the mounting seat (3); the plasma generating cavity (7) is provided with a jet flow groove (4) which is communicated with the downstream of the probe comb support rod (1);
the length of the probe head (2) is 2-20 mm, the probe head can be a single-hole, three-hole, four-hole, five-hole or seven-hole pressure probe, and the number of the probes is 3-5;
the section of the probe comb support rod (1) is waist-shaped, the diameter of the front and rear semi-circles is 3-20 mm, the distance between the centers of the circles is 2-16 mm, and the length of the probe comb support rod is determined according to different measuring environments;
the inner wall of the plasma generation cavity (7) is cylindrical, the axis of the plasma generation cavity is parallel to the axis of the rear semicircle of the probe comb supporting rod (1), the upper end of the plasma generation cavity is flush with the bottom surface of the mounting seat (3), the distance between the lower end of the plasma generation cavity and the top end of the probe comb supporting rod (1) is 0.1-2 mm, and the diameter of the cross section is 2-6 mm;
the number of the plasma generating cavities (7) is 1-3; when the number of the plasma generating cavities (7) is 1, the distance between the circle center of the section of each plasma generating cavity and the circle center of the rear semicircle of the probe comb supporting rod (1) is 0-5 mm; when the number of the plasma generating cavities (7) is 2, the centers of the cross sections of the two plasma generating cavities (7) are symmetrically distributed, the included angle between the center of the cross section of the two plasma generating cavities and the center of the rear half circle of the probe comb supporting rod (1) is 90-180 degrees, the distance between the center of the cross section of the rear half circle of the probe comb supporting rod and the center of the rear half circle of the probe comb supporting rod (1) is 2-5 mm, and the; when the number of the plasma generating cavities (7) is 3, the circle centers of the sections of the three plasma generating cavities (7) are distributed annularly, the center of the ring is the center of the rear semicircle of the probe comb supporting rod (1), the radius of the ring is 2-5 mm, the central angle of the circle centers of the two plasma generating cavities (7) on the ring is 100-150 degrees, and the three plasma generating cavities (7) work synchronously or alternatively;
the exhaust direction of the jet flow groove (4) is parallel to the main flow direction; the width of the outlet of the jet flow groove (4) is 0.1 mm-4 mm, and the length is the same as the height of the plasma generation cavity (7);
the upper end and the lower end of an electrode (8) are fixed in a plasma generating cavity (7) by an end heat insulation layer (9), and a side wall heat insulation layer (10) is separated from the probe comb support rod (1);
the diameter of the electrodes (8) is 0.5 mm-1.5 mm, the distance is 0.2 mm-1 mm, and the materials are cerium-tungsten alloy, titanium alloy or stainless steel;
the power supply required by the electrode (8) is 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.
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