CN111060321A - A probe for measuring the full parameters of the two-dimensional steady flow field in the boundary layer of the inner wall of the casing - Google Patents

A probe for measuring the full parameters of the two-dimensional steady flow field in the boundary layer of the inner wall of the casing Download PDF

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CN111060321A
CN111060321A CN202010063675.6A CN202010063675A CN111060321A CN 111060321 A CN111060321 A CN 111060321A CN 202010063675 A CN202010063675 A CN 202010063675A CN 111060321 A CN111060321 A CN 111060321A
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probe
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temperature sensor
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CN111060321B (en
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马宏伟
屈冬平
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Beihang University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/02—Details or accessories of testing apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
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Abstract

The invention belongs to the technical field of flow field testing, and particularly relates to a probe for measuring the total parameters of a two-dimensional steady-state flow field in a boundary layer of the inner wall of a casing. The head of the probe is cylindrical, a pressure measuring middle hole, a pressure measuring left hole and a pressure measuring right hole which are not communicated with each other are formed in the windward side, a trapezoidal groove is formed in the leeward side back to the pressure measuring middle hole along the axial direction, and the temperature sensor is arranged in the trapezoidal groove and located in a low-speed separation area of the leeward side of the head of the probe. The probe for measuring the total parameters of the two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing can simultaneously measure the total temperature, the total pressure, the static temperature, the static pressure, the Mach number, the deflection angle, the speed and the density of the two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing, and has the characteristics of small size, large insensitive angle of airflow, high reliability, high spatial resolution, high measurement precision and quick response time.

Description

Probe for measuring two-dimensional steady-state flow field full parameters in boundary layer of inner wall of casing
Technical Field
The invention belongs to the technical field of flow field testing, and particularly relates to a probe for measuring full parameters of a two-dimensional steady-state flow field in a boundary layer of the inner wall of a casing, which is suitable for measuring a two-dimensional complex flow field in the boundary layer of the inner wall of the casing such as an air inlet passage, an air compressor, a fan and the like of an aero-engine.
Background
When the airflow flows along the wall surface, the airflow is controlled by the condition of no slip of the wall surface and the condition of outflow velocity, and the airflow generates a strong normal velocity gradient in a thin area close to the wall surface, wherein the area is called as a boundary layer. The boundary layer of the inner wall surface of a casing of an air inlet passage, an air compressor, a fan and the like of an aircraft engine is influenced by the rotation of a rotor, the staggered arrangement of a moving blade row and a static blade row, the leakage flow of a blade top gap and the interaction of the boundary layer, the internal flow is very complex, and meanwhile, the thickness of the boundary layer is thin, so that the accurate measurement of the internal parameters of the boundary layer of the inner wall of the casing is very difficult.
At present, a boundary layer pressure probe and a hot wire anemometer are adopted to measure total pressure and speed parameters in a boundary layer respectively, namely a single probe is used to measure a single parameter separately, on one hand, the measurement mode can cause larger interference to a thin boundary layer flow field, on the other hand, the test complexity and the test cost are increased, most importantly, the flow parameters measured by different probes cannot be guaranteed to come from the same flow line, so that extra errors can be brought when parameters such as speed and the like are calculated in a combined mode, and the test precision is reduced.
Most of three pressure measuring holes of the existing three-hole pressure probe are arranged on the same cross section of the head of the probe, the diameters of the pressure measuring holes are the same, and the circumferential included angle of the left pressure measuring hole and the right pressure measuring hole along the surface of the head of the probe is larger, so that the transverse size of the head of the probe is also larger in the diameter of the head of the probe, the spatial resolution is lower, and the measuring range of the airflow deflection angle is smaller.
Most of the existing temperature probes are designed according to the requirement that a temperature sensor faces a main stream, the head of the temperature probe adopts a stagnation cover structure to collect incoming flow, and the temperature sensor is placed in the stagnation cover; secondly, the strength of the sensor is usually increased by increasing the size of the temperature sensor, and the size of the stagnation cover is added, so that the size of the probe is large, and the spatial resolution is poor; thirdly, the insensitive angle of the airflow is small, and when the deflection angle of the incoming flow to be detected is large, the airflow cannot be fully stagnated; meanwhile, the surface heat exchange of the temperature sensor is insufficient, and the total temperature measurement error is large.
The probe for measuring the total parameters of the two-dimensional stable flow field in the boundary layer of the inner wall of the casing is urgently needed, and is used for measuring the total temperature, the total pressure, the static temperature, the static pressure, the Mach number, the deflection angle, the speed, the density and other total parameters of two-dimensional complex flow fields in the boundary layer of the inner wall of the casing such as an air inlet passage, an air compressor, a fan and the like of an aircraft engine.
Disclosure of Invention
The invention relates to a probe for measuring the whole parameters of a two-dimensional steady-state flow field in an inner wall boundary layer of a casing, wherein the head part of the probe is cylindrical, and the windward side of the head part of the probe is provided with a pressure measuring middle hole, a pressure measuring left hole and a pressure measuring right hole which are not communicated with each other, compared with the traditional three-hole pressure probe, the three pressure measuring holes are arranged on the same cross section of the head part of the probe, namely in a shape like a Chinese character 'yi', the invention creatively provides that the three pressure measuring holes are arranged in a shape like a Chinese character 'pin', the transverse size of the head part of the probe, namely the diameter of the head part of the probe, wherein compared with the pressure measuring left hole and the pressure measuring right hole, the distance between the pressure measuring middle hole and the top end of the head part of the probe is larger, the probe is particularly suitable for measuring the parameters of the two-dimensional, the measuring range of the deflection angle of the airflow is effectively improved. The invention abandons the traditional design concept of the total temperature probe, does not design according to the method that the temperature sensor faces the main stream and the stagnation cover is adopted to make the airflow stagnation so as to realize the total temperature measurement, but based on years of research of the applicant, creatively provides the layout and the structural design that the temperature sensor faces away from the main stream and is arranged on the leeward side of the head part of the probe, and the temperature sensor is positioned on the central axis of the pressure measuring mesopore, so that the measurement of the whole parameters on the same flow line can be ensured, meanwhile, the influence of the air flow on the temperature sensor, such as the flushing of the temperature sensor and the oil drops and dust mixed in the air flow, and the like is effectively reduced, and the service life of the temperature; the size of the head of the probe is effectively reduced, and the spatial resolution of the probe is improved; the convection heat transfer between the air flow and the temperature sensor is enhanced, so that the temperature recovery coefficient is high and stable within a large deflection angle range. Most importantly, the probe for measuring the total parameters of the two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing can simultaneously measure the total temperature, the total pressure, the static temperature, the static pressure, the Mach number, the deflection angle, the speed and the density of the two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing by adopting a single probe.
The invention provides a probe for measuring the full parameters of a two-dimensional steady-state flow field in a boundary layer of the inner wall of a casing, which aims to solve the technical problems that: firstly, the existing probe cannot simultaneously measure the total temperature, total pressure, static temperature, static pressure, Mach number, deflection angle, speed, density and other all parameters of a two-dimensional steady-state flow field in a boundary layer of the inner wall of a casing; secondly, the existing temperature probe temperature sensor is easy to damage and short in service life; thirdly, the existing probe has the problems of large size, poor spatial resolution and slow response; fourthly, the problem that the current temperature probe has small insensitive angle of airflow is solved; fifthly, the existing pressure probe has a small range of measuring deflection angles.
The technical scheme of the invention is as follows:
1. the utility model provides a measure probe of machine casket inner wall boundary layer internal dimension steady state flow field full parameter, by probe head (1), temperature sensor (2), adiabatic insulating seal spare (3), temperature sensor cable extraction passageway (4), pressure measurement mesopore (5), pressure measurement left pore (6), pressure measurement right pore (7), draw and press pipe passageway (8), probe branch (9), temperature sensor cable (10) and draw and press pipe (11) to constitute, its characterized in that: the probe head (1) is cylindrical, a pressure measuring middle hole (5), a pressure measuring left hole (6) and a pressure measuring right hole (7) which are not communicated with each other are formed in the windward side of the probe head (1), a trapezoidal groove is cut in the leeward side of the probe head (1) back to the pressure measuring middle hole (5) along the axial direction, and the temperature sensor (2) is arranged in the trapezoidal groove.
2. Further, the columniform diameter of probe head (1) is 1 ~ 6 millimeters, length is 5 ~ 45 millimeters, seted up three circular leading pressure pipe passageway (8) and a circular temperature sensor cable extraction passageway (4) that do not communicate with each other along the probe axial, three circular leading pressure pipe passageway (8) respectively with pressure measurement mesopore (5) on probe head (1) top, pressure measurement left hole (6), pressure measurement right hole (7) intercommunication, and respectively with encapsulate three leading pressure pipes intercommunication at probe head (1) and probe branch (9) junction, leading pressure pipe (11) draw out probe branch (9) afterbody through leading pressure pipe passageway (8) in probe branch (9).
3. Furthermore, the orifice of the pressure measuring mesopore (5) is a hemispherical surface which is recessed inwards, the diameter of the spherical surface is 0.3-2.4 mm, the diameter of the pressure measuring mesopore (5) is 0.2-2 mm, the center line of the pressure measuring mesopore (5) is perpendicular to and intersected with the center line of the column body, and the distance between the center line of the pressure measuring mesopore (5) and the top end of the probe head (1) is 0.5-4 mm; the pressure measurement left hole (6) and the pressure measurement right hole (7) are circular, the diameters are the same and are half of the diameters of the pressure measurement middle holes (5), the plane where the central line of the pressure measurement left hole (6) is perpendicular to the central line of the cylinder, and the central line of the pressure measurement right hole (7) is intersected on the central line of the cylinder, the pressure measurement left hole (6) and the pressure measurement right hole (7) are symmetrical about the plane formed by the central line of the pressure measurement middle holes (5) and the central line of the cylinder, the circumferential included angle on the surface of the cylinder of the probe head (1) is 15-60 degrees, the distance between the central line of the pressure measurement left hole (6) and the top end of the probe head (1) is 0..
4. Furthermore, the length of the trapezoid groove along the axial direction of the probe is 0.8-6 mm, the included angle of two side surfaces of the trapezoid groove is 90-150 degrees, the distance between the surface of the trapezoid groove perpendicular to the central line of the pressure measuring central hole (5) and the central line of the cylinder is 0.1-1.5 mm, the distance between the central line of the temperature sensor cable leading-out channel (4) and the central line of the cylinder is 0.3-2.5 mm, the central line of the temperature sensor cable leading-out channel (4), the central line of the cylinder and the central line of the pressure measuring central hole pressure tube channel (8) are on the same plane, the central line of the temperature sensor cable leading-out channel (4), the central line of the pressure measuring central hole pressure tube channel (8) are on two sides of the central line of the cylinder, the head of the temperature sensor (2) is positioned on the intersection point of the central line of the pressure measuring central, the heat insulation sealing element (3) plays roles of heat insulation, sealing and fixing, the temperature sensor cable (10) is led out of the tail of the probe supporting rod (9) through the temperature sensor cable leading-out channel (4) in the probe, and the cylindrical axis of the probe head (1) is superposed with the cylindrical axis of the probe supporting rod (9).
5. After the probe is calibrated, the probe can simultaneously measure the total temperature, the total pressure, the static temperature, the static pressure, the Mach number, the deflection angle, the speed and the density of a two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing.
The invention has the beneficial effects that:
the probe for measuring the total parameters of the two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing can simultaneously measure the total temperature, the total pressure, the static temperature, the static pressure, the Mach number, the deflection angle, the speed and the density of the two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing by using a single probe, effectively reduces the interference on the measured flow field, improves the test precision, simplifies the test operation and reduces the test cost.
Compared with a pressure measuring left hole and a pressure measuring right hole, the distance between the pressure measuring middle hole and the top end of the probe head is larger, the pressure measuring middle hole is particularly suitable for measuring parameters of a two-dimensional steady-state flow field in a boundary layer of the inner wall surface of a casing of an air inlet passage, an air compressor, a fan and the like of an aero-engine, meanwhile, the diameter of the pressure measuring middle hole is larger, and a circumferential included angle of the central lines of the pressure measuring left hole and the pressure measuring right hole on the surface of a cylinder at the probe head is smaller.
The temperature sensor is back to the main stream and is positioned in the low-speed separation area on the leeward side of the head of the probe, so that the scouring of the temperature sensor by airflow is reduced, the influence of oil drops, dust and the like mixed in the airflow on the temperature sensor is reduced, and the service life of the temperature sensor is effectively prolonged; secondly, the requirement on the strength of the temperature sensor is low, the size of the temperature sensor can be small, and meanwhile, a stagnation cover is not needed for collecting incoming flow, so that the size of the probe is small, and the spatial resolution is high; thirdly, the range of the separation low-speed area is large, and the heat exchange between the airflow and the temperature sensor is effectively enhanced by the vortex in the separation area, so that the temperature recovery coefficient is high and stable in a large deflection angle range during measurement; fourthly, the temperature sensor is directly arranged in the flow field, and the response time is fast. Meanwhile, the temperature sensor is arranged on the leeward side of the head of the probe, and the temperature sensor is positioned on the central line of the pressure measuring central hole, so that the simultaneous measurement of all parameters of the same streamline is ensured.
The probe for measuring the full parameters of the two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing can simultaneously measure the full parameters of the two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing, and has the characteristics of small size, large air flow insensitivity angle, high reliability, high spatial resolution, high measurement precision and quick response time.
Drawings
Fig. 1 is a schematic structural diagram of a probe for measuring full parameters of a two-dimensional steady-state flow field in a boundary layer of an inner wall of a casing according to a first embodiment of the present invention.
Fig. 2 is a view in the direction a of fig. 1.
Fig. 3 is a right side view of fig. 1.
Fig. 4 is a left side view of fig. 1.
Wherein: 1-probe head, 2-temperature sensor, 3-heat insulation sealing element, 4-temperature sensor cable leading-out channel, 5-pressure measuring middle hole, 6-pressure measuring left hole, 7-pressure measuring right hole, 8-pressure leading tube channel, 9-probe supporting rod, 10-temperature sensor cable and 11-pressure leading tube.
FIG. 5 is a schematic view of the installation of the probe of the invention for measuring the two-dimensional flow field of the boundary layer of the inner wall of the compressor interstage casing.
Wherein: 1-casing wall surface, 2-first-stage rotor, 3-first-stage stator, 4-second-stage rotor, 5-second-stage stator, 6-third-stage rotor, 7-third-stage stator, 8-hub wall surface, 9-probe of the invention, and 10-boundary layer velocity profile.
Fig. 6 is a schematic structural diagram of a probe for measuring full parameters of a two-dimensional steady-state flow field in a boundary layer of an inner wall of a casing according to a second embodiment of the present invention.
Fig. 7 is a view along direction a of fig. 6.
Fig. 8 is a right side view of fig. 6.
Fig. 9 is a left side view of fig. 6.
Wherein: 1-probe head, 2-temperature sensor, 3-heat insulation sealing element, 4-temperature sensor cable leading-out channel, 5-pressure measuring middle hole, 6-pressure measuring left hole, 7-pressure measuring right hole, 8-pressure leading tube channel, 9-probe supporting rod, 10-temperature sensor cable and 11-pressure leading tube.
FIG. 10 is a schematic view of the installation of the probe of the present invention for measuring the two-dimensional flow field of the boundary layer on the inner wall of the inlet casing of an aircraft engine.
Wherein: 1-casing wall, 2-probe of the invention, 3-boundary layer velocity profile.
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 boundary layer of the inner wall of the turbine interstage casing, the measurement space is narrow, the boundary layer is thin, the incoming flow two-dimensional performance is strong, the deflection angle is large, but the speed is relatively low. In order to ensure the spatial resolution, the transverse size of the probe head and the diameter of the pressure measuring hole are selected to be smaller, and the temperature sensor can adopt a bare wire thermocouple with smaller size to ensure the refined measurement and improve the measurement precision, so the following implementation mode can be adopted:
fig. 1-4 are schematic diagrams of the probe of the invention applied to measuring the boundary layer of the inner wall of the compressor interstage casing, and fig. 5 is an installation schematic diagram of the probe of the invention applied to measuring the boundary layer of the inner wall of the compressor interstage casing. The invention discloses a probe for measuring the whole parameters of a two-dimensional steady-state flow field in a boundary layer of the inner wall of a casing, which consists of a probe head (1), a temperature sensor (2), a heat insulation sealing element (3), a cable leading-out channel (4) of the temperature sensor, a pressure measuring middle hole (5), a pressure measuring left hole (6), a pressure measuring right hole (7), a pressure leading pipe channel (8), a probe supporting rod (9), a temperature sensor cable (10) and a pressure leading pipe (11), and is characterized in that: the probe head (1) is cylindrical, a pressure measuring middle hole (5), a pressure measuring left hole (6) and a pressure measuring right hole (7) which are not communicated with each other are formed in the windward side of the probe head (1), a trapezoidal groove is cut in the leeward side of the probe head (1) back to the pressure measuring middle hole (5) along the axial direction, the temperature sensor (2) is arranged in the trapezoidal groove, and the temperature sensor is a bare wire thermocouple.
The cylindrical diameter of probe head (1) is 1 millimeter, length is 5 millimeters, three circular leading pressure pipe passageway (8) and a circular temperature sensor cable extraction passageway (4) that do not communicate with each other are seted up along the probe axial, three circular leading pressure pipe passageway (8) respectively with pressure measurement mesopore (5) on probe head (1) top, pressure measurement left pore (6), pressure measurement right pore (7) intercommunication, and respectively with encapsulate three leading pressure pipes intercommunication at probe head (1) and probe branch pole (9) junction, leading pressure pipe (11) are drawn forth probe branch pole (9) afterbody through leading pressure pipe passageway (8) in probe branch pole (9).
The orifice of the pressure measuring mesopore (5) is a hemispherical surface which is recessed inwards, the diameter of the spherical surface is 0.3 mm, the diameter of the pressure measuring mesopore (5) is 0.2 mm, the center line of the pressure measuring mesopore (5) is perpendicular to and intersected with the center line of the column body, and the distance between the center line of the pressure measuring mesopore and the top end of the probe head (1) is 0.5 mm; pressure measurement left side hole (6), pressure measurement right side hole (7) are circular, the diameter is the same and is the half of pressure measurement mesopore (5) diameter, pressure measurement left side hole (6) central line is perpendicular with cylinder central line with pressure measurement right side hole (7) central line place plane, and intersect on the cylinder central line, pressure measurement left side hole (6), pressure measurement right side hole (7) are about the plane symmetry that pressure measurement mesopore (5) central line and cylinder central line formed, the circumference contained angle on probe head (1) cylinder surface is 15, pressure measurement left side hole (6), pressure measurement right side hole (7) central line and probe head (1) top distance are 0.2 millimeters.
The length of the trapezoid groove along the axis direction of the probe is 0.8 mm, the included angle of two side surfaces of the trapezoid groove is 90 degrees, the distance between the surface of the trapezoid groove perpendicular to the central line of the pressure measuring mesopore (5) and the central line of the cylinder is 0.1 mm, the distance between the central line of the temperature sensor cable leading-out channel (4) and the central line of the cylinder is 0.3 mm, the central line of the temperature sensor cable leading-out channel (4), the central line of the cylinder and the central line of the pressure measuring mesopore leading-out channel (8) are on the same plane, the central line of the temperature sensor cable leading-out channel (4) and the central line of the pressure measuring mesopore leading-out channel (8) are on two sides of the central line of the cylinder, the head of the temperature sensor (2) is positioned on the intersection point of the central line of the pressure measuring mesopore (5) and the central line of the temperature sensor cable leading-out channel (4) The tail part, the cylindrical axis of the probe head part (1) is coincided with the cylindrical axis of the probe supporting rod (9).
The probe for measuring the total parameters of the two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing is based on the characteristics of the head of the fluid streaming probe, the pressure distribution obtained by measuring through a pressure measuring hole on the windward side of the head of the probe and the total temperature of airflow obtained by measuring through a temperature sensor on the leeward side of the head of the probe are utilized, and then the total parameters of the two-dimensional flow field in the boundary layer of the inner wall of the casing are obtained through calculation by utilizing a calibration coefficient curve obtained through calibration of a standard wind tunnel. The specific use method is as follows:
the probe of the invention needs to be calibrated before use, and a pneumatic calibration curve of the probe is obtained. The probe calibration is carried out in a calibration wind tunnel, the probe deflection angle is changed within a calibration range under different Mach numbers, and a change curve of each calibration coefficient along with the deflection angle and the Mach number can be obtained through pneumatic calibration; the calibration coefficients comprise a deflection angle coefficient, a total pressure coefficient, a static pressure coefficient and a temperature recovery coefficient, and are defined as follows:
Figure BDA0002375300670000051
Figure BDA0002375300670000052
Figure BDA0002375300670000053
Figure BDA0002375300670000054
wherein, CpyAs coefficient of deflection angle, CptIs the total pressure coefficient, CpsIs a static pressure coefficient, CTFor the recovery of coefficient of temperature, Pt、Ps、TtAnd TsRespectively calibrating the total pressure, static pressure, total temperature and static temperature of the wind tunnel incoming flow, P1、P2And P3Pressure values, T, measured respectively for the pressure measuring center hole, the pressure measuring left hole and the pressure measuring right holepIs the temperature value measured by the temperature sensor.
When the probe is used, the probe is inserted into a measured flow field to obtain the pressure measured by the three pressure measuring holes and the temperature measured by the temperature sensor on the leeward side of the head of the probe, and the total temperature, the total pressure, the static temperature, the static pressure, the Mach number, the deflection angle, the speed and the density of the two-dimensional steady-state flow field are obtained by combining the following formulas based on the pressure measured by the three pressure measuring holes and the temperature measured by the temperature sensor on the leeward side of the head of the probe according to the known calibration coefficient curve.
Figure BDA0002375300670000055
Figure BDA0002375300670000056
Figure BDA0002375300670000057
c2＝γRTs
PS＝ρRTS
Wherein, PtAnd PsIs total pressure and static pressure of the flow field, gamma is adiabatic index of the flow field, TtAnd TsThe total temperature and the static temperature of the flow field, Ma is the Mach number of the flow field, v is the flow field velocity, rho is the density, c is the local acoustic velocity of the flow field, and R is the gas constant.
That is, the total temperature, total pressure, static temperature, static pressure, Mach number, deflection angle, speed and density of a two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing can be obtained simultaneously by adopting a single probe.
Example two:
for the measurement of the boundary layer of the air inlet passage of the aircraft engine, the flow passage is longer, the boundary layer is thicker and the incoming flow is more uniform, but because the speed in the air inlet passage is higher, the air inlet passage is easy to contain impurities such as dust, rainwater and the like. Therefore, the transverse size of the head of the probe is selected to be larger so as to ensure the strength and the rigidity, the diameter of the pressure measuring hole is selected to be larger so as to prevent the pressure measuring hole from being polluted by impurities such as dust, rainwater and the like, and the temperature sensor can adopt an armored thermocouple so as to ensure the service life. The following embodiments may thus be employed:
fig. 6 to 9 are schematic diagrams of the probe of the present invention applied to measure the boundary layer of the inner wall of the air inlet duct, and fig. 10 is a schematic diagram of the probe of the present invention applied to measure the boundary layer of the inner wall of the air inlet duct. The invention discloses a probe for measuring the whole parameters of a two-dimensional steady-state flow field in a boundary layer of the inner wall of a casing, which consists of a probe head (1), a temperature sensor (2), a heat insulation sealing element (3), a cable leading-out channel (4) of the temperature sensor, a pressure measuring middle hole (5), a pressure measuring left hole (6), a pressure measuring right hole (7), a pressure leading pipe channel (8), a probe supporting rod (9), a temperature sensor cable (10) and a pressure leading pipe (11), and is characterized in that: the probe head (1) is cylindrical, a pressure measuring middle hole (5), a pressure measuring left hole (6) and a pressure measuring right hole (7) which are not communicated with each other are formed in the windward side of the probe head (1), a trapezoidal groove is cut in the leeward side of the probe head (1) back to the pressure measuring middle hole (5) along the axial direction, the temperature sensor (2) is arranged in the trapezoidal groove, and the temperature sensor is an armored thermocouple.
The cylindrical diameter of probe head (1) is 6 millimeters, length is 45 millimeters, three circular leading pressure pipe passageway (8) and a circular temperature sensor cable extraction passageway (4) that do not communicate with each other are seted up along the probe axial, three circular leading pressure pipe passageway (8) respectively with pressure measurement mesopore (5) on probe head (1) top, pressure measurement left pore (6), pressure measurement right pore (7) intercommunication, and respectively with encapsulate three leading pressure pipes intercommunication at probe head (1) and probe branch pole (9) junction, leading pressure pipe (11) are drawn forth probe branch pole (9) afterbody through leading pressure pipe passageway (8) in probe branch pole (9).
The orifice of the pressure measuring mesopore (5) is a hemispherical surface which is recessed inwards, the diameter of the spherical surface is 2.4 mm, the diameter of the pressure measuring mesopore (5) is 2 mm, the center line of the pressure measuring mesopore (5) is perpendicular to and intersected with the center line of the column body, and the distance between the center line of the pressure measuring mesopore and the top end of the probe head (1) is 4 mm; pressure measurement left side hole (6), pressure measurement right side hole (7) are circular, the diameter is the same and is one half of pressure measurement mesopore (5) diameter, pressure measurement left side hole (6) central line is perpendicular with cylinder central line with pressure measurement right side hole (7) central line place plane, and intersect on the cylinder central line, pressure measurement left side hole (6), pressure measurement right side hole (7) are about the plane symmetry that pressure measurement mesopore (5) central line and cylinder central line formed, the circumference contained angle on probe head (1) cylinder surface is 60, pressure measurement left side hole (6), pressure measurement right side hole (7) central line and probe head (1) top distance are 1.5 millimeters.
The length of the trapezoid groove along the axis direction of the probe is 6 mm, the included angle of two side faces of the trapezoid groove is 150 degrees, the distance between the face of the trapezoid groove perpendicular to the central line of the pressure measuring mesopore (5) and the central line of the cylinder is 1.5 mm, the distance between the central line of the temperature sensor cable leading-out channel (4) and the central line of the cylinder is 2.5 mm, the central line of the temperature sensor cable leading-out channel (4), the central line of the cylinder and the central line of the pressure measuring mesopore leading-out channel (8) are on the same plane, the central line of the temperature sensor cable leading-out channel (4) and the central line of the pressure measuring mesopore leading-out channel (8) are arranged on two sides of the central line of the cylinder, the head of the temperature sensor (2) is positioned on the intersection point of the central line of the pressure measuring mesopore (5) and the central line of the temperature sensor cable leading-out channel ( ) The tail part, the cylindrical axis of the probe head part (1) is coincided with the cylindrical axis of the probe supporting rod (9).
That is, the total temperature, the total pressure, the static temperature, the static pressure, the Mach number, the deflection angle, the speed and the density of a two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing can be simultaneously obtained by adopting a single probe, so that the interference on the measured flow field is effectively reduced, the test precision is improved, the test operation is simplified, and the test cost is reduced; the three pressure measuring holes are arranged in a shape like a Chinese character 'pin', so that the diameter of the head of the probe is effectively reduced, and the measuring range of the airflow deflection angle is improved; according to the invention, the temperature sensor (2) is back to the main stream and is arranged on the leeward side of the probe head (1), the layout and the structural design effectively reduce the influence of the air flow on the temperature sensor (2) due to the scouring of the air flow on the temperature sensor (2) and the influence of oil drops, dust and the like mixed in the air flow on the temperature sensor (2), and the service life of the temperature sensor (2) is prolonged; the size of the probe head (1) is effectively reduced, and the spatial resolution of the probe is improved; the convection heat transfer between the air flow and the temperature sensor (2) is enhanced, so that the temperature recovery coefficient is high and stable within a larger deflection angle range; and the temperature sensor (2) is positioned on the central axis of the pressure measuring center hole, so that multi-parameter measurement of the same streamline can be ensured. The invention effectively solves the problem that the existing probe can not simultaneously measure the total temperature, total pressure, static temperature, static pressure, Mach number, deflection angle, speed, density and other full parameters of the two-dimensional steady-state flow field in the boundary layer of the inner wall of the casing; the problems that the existing temperature probe temperature sensor is easy to damage and short in service life are solved; the problems of large size, poor spatial resolution and slow response of the conventional probe are solved; the problem that the current temperature probe has a small insensitive angle of airflow is solved; the problem that the existing pressure probe is small in measuring deflection angle range is solved.

Claims (1)

1.一种测量机匣内壁附面层内二维稳态流场全参数的探针，由探针头部(1)、温度传感器(2)、绝热绝缘密封件(3)、温度传感器线缆引出通道(4)、测压中孔(5)、测压左孔(6)、测压右孔(7)、引压管通道(8)、探针支杆(9)、温度传感器线缆(10)和引压管(11)组成，其特征在于：探针头部(1)为圆柱形，探针头部迎风面上开有互不相通的测压中孔(5)、测压左孔(6)和测压右孔(7)，背对测压中孔(5)的探针头部背风面侧沿轴向切去一梯形槽，温度传感器(2)置于梯形槽内；1. A probe for measuring the full parameters of a two-dimensional steady flow field in a boundary layer of an inner wall of a casing, comprising a probe head (1), a temperature sensor (2), a thermal insulation seal (3), a temperature sensor wire Cable lead-out channel (4), pressure measuring middle hole (5), pressure measuring left hole (6), pressure measuring right hole (7), pressure pipe channel (8), probe support rod (9), temperature sensor line The cable (10) is composed of a pressure-inducing tube (11), and is characterized in that: the probe head (1) is cylindrical, and the windward surface of the probe head is provided with a pressure-measuring hole (5), a pressure-measuring hole (5) that does not communicate with each other, Press the left hole (6) and the right pressure measuring hole (7), cut a trapezoidal groove along the axial direction on the leeward side of the probe head facing away from the pressure measuring middle hole (5), and place the temperature sensor (2) in the trapezoidal groove Inside; 探针头部(1)圆柱形的直径为1～6毫米，长度为5～45毫米，沿探针轴向开设有互不相通的三个圆形引压管通道(8)和一个圆形温度传感器线缆引出通道(4)，三个圆形引压管通道(8)分别与探针头部顶端的测压中孔(5)、测压左孔(6)、测压右孔(7)连通，并分别与封装在探针头部与探针支杆连接处的三根引压管连通，引压管(11)通过探针支杆(9)内的引压管通道(8)引出探针支杆(9)尾部；The probe head (1) has a cylindrical diameter of 1 to 6 mm and a length of 5 to 45 mm, and is provided with three circular pressure-inducing tube channels (8) that do not communicate with each other along the axial direction of the probe and a circular The temperature sensor cable lead-out channel (4), the three circular pressure-inducing tube channels (8) are respectively connected with the pressure-measuring middle hole (5), the pressure-measuring left hole (6), and the pressure-measuring right hole ( 7) Connect, and communicate with the three pressure-inducing tubes encapsulated at the connection between the probe head and the probe support rod respectively, and the pressure-inducing tubes (11) pass through the pressure-inducing tube channel (8) in the probe support rod (9). Lead out the tail of the probe support rod (9); 测压中孔(5)孔口为往里凹进去的半球面形，球面直径为0.3～2.4毫米，测压中孔(5)直径为0.2～2毫米，测压中孔(5)中心线与柱体中心线垂直且相交，且与探针头部(1)顶端距离为0.5～4毫米；测压左孔(6)、测压右孔(7)均为圆形，直径相同均为测压中孔(5)直径的二分之一，测压左孔(6)中心线与测压右孔(7)中心线所在平面与柱体中心线垂直，且相交于柱体中心线上，测压左孔(6)、测压右孔(7)关于测压中孔(5)中心线和柱面中心线形成的平面对称，在探针头部(1)圆柱体表面上的圆周夹角为15°～60°，测压左孔(6)、测压右孔(7)中心线与探针头部(1)顶端距离为0.2～1.5毫米；The orifice of the pressure measuring hole (5) is a concave hemispherical surface, the diameter of the spherical surface is 0.3 to 2.4 mm, the diameter of the pressure measuring hole (5) is 0.2 to 2 mm, and the center line of the pressure measuring hole (5) It is perpendicular to and intersects with the center line of the cylinder, and the distance from the top of the probe head (1) is 0.5 to 4 mm; the pressure measurement left hole (6) and the pressure measurement right hole (7) are both circular and have the same diameter. One half of the diameter of the pressure measuring hole (5), the plane where the center line of the pressure measuring left hole (6) and the pressure measuring right hole (7) center line are perpendicular to the cylinder center line, and intersect on the cylinder center line , the pressure measuring left hole (6) and the pressure measuring right hole (7) are symmetrical about the plane formed by the center line of the pressure measuring hole (5) and the center line of the cylinder, and the circumference on the surface of the cylinder of the probe head (1) The included angle is 15°～60°, and the distance between the center line of the pressure measuring left hole (6) and the pressure measuring right hole (7) and the top of the probe head (1) is 0.2～1.5 mm; 梯形槽沿探针轴线方向的长度为0.8～6毫米，梯形槽两侧面的夹角为90°～150°，梯形槽垂直于测压中孔中心线的面与柱体中心线的距离为0.1～1.5毫米，温度传感器线缆引出通道(4)中心线与柱体中心线的距离为0.3～2.5毫米，温度传感器线缆引出通道(4)中心线、柱体中心线及测压中孔引压管通道(8)中心线在同一平面，且温度传感器线缆引出通道(4)中心线、测压中孔引压管通道(8)中心线在柱体中心线的两侧，温度传感器头部位于测压中孔(5)中心线与温度传感器线缆引出通道(4)中心线的交点上，温度传感器(2)通过绝热绝缘密封件(3)固定，温度传感器线缆(10)通过探针内的温度传感器线缆引出通道(4)引出探针支杆(9)尾部，探针头部(1)圆柱体轴线与探针支杆(9)圆柱体轴线重合；The length of the trapezoidal groove along the axis of the probe is 0.8 to 6 mm, the angle between the two sides of the trapezoidal groove is 90° to 150°, and the distance between the surface of the trapezoidal groove perpendicular to the center line of the hole in the pressure measurement and the center line of the cylinder is 0.1 ～1.5 mm, the distance between the center line of the temperature sensor cable lead-out channel (4) and the center line of the cylinder is 0.3 to 2.5 mm, the center line of the temperature sensor cable lead-out channel (4), the center line of the cylinder and the pressure measurement hole lead The center line of the pressure pipe channel (8) is on the same plane, and the center line of the temperature sensor cable lead-out channel (4) and the center line of the pressure pipe channel (8) in the pressure measuring hole are on both sides of the cylinder center line, and the temperature sensor head The part is located at the intersection of the center line of the pressure measuring hole (5) and the center line of the temperature sensor cable lead-out channel (4). The temperature sensor cable lead-out channel (4) in the probe leads out the tail of the probe support rod (9), and the cylinder axis of the probe head (1) coincides with the cylinder axis of the probe support rod (9); 测量前，通过校准风洞对本发明探针进行标定，获得探针校准曲线；实际测量中，基于本发明探针三个测压孔和温度传感器测得的数据，再根据标定获得的校准系数曲线及公式，通过数据处理，可同时测量机匣内壁附面层内二维稳态流场的总温、总压、静温、静压、马赫数、偏转角、速度及密度；本发明三个测压孔呈“品”字形布置，有效减小了探针头部直径，提高了气流偏转角测量范围；本发明温度传感器(2)背对主流、置于探针头部(1)背风面的布局和结构设计，有效提高了温度传感器(2)的使用寿命；提高了探针空间分辨率；加强了气流与温度传感器(2)的对流换热，提高了测量精度。Before the measurement, the probe of the present invention is calibrated through the calibration wind tunnel to obtain the probe calibration curve; in the actual measurement, based on the data measured by the three pressure measuring holes and the temperature sensor of the probe of the present invention, and then according to the calibration coefficient curve obtained by the calibration and formula, through data processing, the total temperature, total pressure, static temperature, static pressure, Mach number, deflection angle, velocity and density of the two-dimensional steady flow field in the boundary layer of the inner wall of the casing can be measured simultaneously; The pressure measuring holes are arranged in a "pin" shape, which effectively reduces the diameter of the probe head and improves the measurement range of the airflow deflection angle; the temperature sensor (2) of the present invention faces the mainstream and is placed on the leeward side of the probe head (1). The layout and structural design of the device effectively increase the service life of the temperature sensor (2); improve the spatial resolution of the probe; strengthen the convective heat transfer between the airflow and the temperature sensor (2), and improve the measurement accuracy.
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