CN106706204A - Pressure sensor cooling device applicable to high-temperature environment test - Google Patents
Pressure sensor cooling device applicable to high-temperature environment test Download PDFInfo
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- CN106706204A CN106706204A CN201710090844.3A CN201710090844A CN106706204A CN 106706204 A CN106706204 A CN 106706204A CN 201710090844 A CN201710090844 A CN 201710090844A CN 106706204 A CN106706204 A CN 106706204A
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- cooling
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- pressure sensor
- cooling device
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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
- G01L19/0681—Protection against excessive heat
Abstract
The invention discloses a pressure sensor cooling device applicable to a high-temperature environment test. The pressure sensor cooling device comprises a cooling heat exchange structure with a hollow cavity, wherein the hollow cavity of the cooling heat exchange structure is divided into an inner cavity and an outer cavity; the outer cavity is separated into two parts of which bottoms are communicated with each other; a cooling water inlet pipe communicated with one part of the outer cavity and a cooling water outlet pipe communicated with the other part of the outer cavity are arranged on the top of the cooling heat exchange structure; a sensor mounting seat is arranged on the top of the inner cavity, a pressure drawing pipe is arranged at the bottom of the inner cavity; and a temperature sensor mounting seat which penetrates through one part of the outer cavity and is communicated with the inner cavity, and a nitrogen supply pipe which penetrates through the other part of the outer cavity and is communicated with the inner cavity are arranged in the peripheral direction of the cooling heat exchange structure. According to the pressure sensor cooling device disclosed by the invention, dynamic pressure measurement errors of unsteady fluid media in the existing high-temperature environment can be reduced.
Description
Technical field：
The present invention relates to a kind of pressure sensor cooling structure, more particularly to a kind of pressure suitable for hot environment test
Sensor cooling device.
Background technology：
Pressure is the important state parameter for characterizing studied subject fluid mechanical characteristic, for unstable state flow process, work
The state parameters such as pressure, the temperature of matter by time to time change, with dynamic change characterization.At present, dynamic pressure extensive use
In industrial production and scientific research field, such as the pressure in internal combustion engine, gas turbine, steam turbine, rocket engine is substantially
Dynamically, the gun pressure and explosion wave of firearms are dynamic pressures, hydraulic pressure in various industrial control equipments and dynamic power machine,
The pulse of pneumatic means is also dynamic pressure.Therefore need to carry out the measurement of dynamic pressure, it is special to study its hydrodynamics
Property.
Because the measurement of dynamic pressure usually requires that the response time faster, common dynamic pressure transducer mainly has pressure
Electric-type sensor and piezoresistive transducer.Commercially use silicon pressure sensor is mainly silicon diffused pressure drag type pressure sensing
Device, its technical maturity and excellent performance, but it is limited by P-N junction heatproof, and pressure measxurement can only be carried out below 120 DEG C, is exceeded
At 120 DEG C, the performance meeting severe exacerbation of sensor causes so that failure, can occur plastic deformation and current leakage at 600 DEG C
The extreme imbalance of signal processing system and circuit, far from meeting the field such as Aero-Space, generating, petrochemical industry, automobile high temperature
Pressure measxurement demand under environment.Further for the measurement of high-temp combustion fluid working substance, there is thermal shock problem in pressure sensor,
I.e. during fuel combustion, the heat for being delivered to pressure sensor primary element is sharply increased, so as to thermal shock occur, causes pressure
Force snesor deformation failure.
Conventional high-temperature environment liquid working medium dynamic pressure measurement mainly realizes that high temperature is tested working medium by pressure guiding pipe more long
Heat gradually scatters and disappears after pressure guiding pipe, Temperature of Working eventually drop to sensor stabilization run allowed maximum operation temperature with
Under.This method of testing is relatively specific for the dynamic pressure measurement of low frequency pulsating fluid working substance, but is pulsed for high frequency unstable state
Flow working medium, using pressure guiding pipe more long after, between the pressure signal and fluid working substance true pressure signal measured by sensor
Amplitude-frequency and phase-frequency characteristic there will be larger difference, and the size of measurement error is proportional with impulse length of tube, and pressure guiding pipe is got over
Measurement error long is bigger.
The content of the invention：
Error the invention aims to reduce unstable state fluid working substance dynamic pressure measurement under existing hot environment,
There is provided a kind of pressure sensor cooling device suitable for hot environment test.The technical scheme is that：
To reach above-mentioned purpose, the present invention adopts the following technical scheme that to realize：
A kind of pressure sensor cooling device suitable for hot environment test, including the heat of the cooling with hollow cavity is handed over
Structure is changed, the hollow cavity of the cooling heat exchange structure is divided into inside and outside two cavitys, and outer chamber is spaced apart bottom connection
Two parts, cooling heat exchange structure at the top of be provided be connected with a part of outer chamber cooling water inlet pipe, and with it is another
The cooling water outlet pipe that a part of outer chamber is connected, is provided with sensor installation seat at the top of inner chamber body, bottom is provided with draws
Pressure pipe, a part of outer chamber and the temperature sensor being connected with inner chamber body are provided through in the circumference for cooling down heat exchange structure
Mounting seat, and through another part outer chamber and the nitrogen supply pipe that is connected with inner chamber body.
Further improvement of the invention is that the installation site of nitrogen supply pipe is higher than the installation of temperature sensor mounting seat
Position.
Further improvement of the invention is that nitrogen stop valve is additionally provided with nitrogen supply pipe, for controlling cooling nitrogen
The supply of gas.
Further improvement of the invention is to be additionally provided with cooling device mounting seat in the circumference for cooling down heat exchange structure.
Further improvement of the invention is that cooling device mounting seat installs two kinds of forms using flange and screw thread.
Further improvement of the invention is that pressure guiding pipe uses two kinds of stagnation pressure pressure guiding pipe and static pressure pressure guiding pipe, is respectively intended to
The stagnation pressure and static pressure of the tested working medium of measurement.
Further improvement of the invention is that sensor installation seat is connected through a screw thread the top for being arranged on inner chamber body, draws
Pressure pipe is connected through a screw thread the bottom for being arranged on inner chamber body.
Further improvement of the invention is that cooling heat exchange structure includes cooling cavity outer wall and the cooling of concentric arrangement
Cavity wall, is arranged on the cooling chamber cover plate at the top of cooling cavity outer wall top and cooling cavity wall, and be arranged on cooling cavity outer wall
Bottom and the cooling chamber base plate of cooling cavity wall bottom, wherein, between cooling cavity wall and cooling chamber cover plate and cooling chamber base plate
Inner chamber body is formed, outer chamber is formed between cooling cavity outer wall and cooling cavity wall and cooling chamber cover plate and cooling chamber base plate, this is outer
Cavity is two parts by cooling chamber baffle interval, and a part is left semicircle shape cooling flowing path, and another part is that right semicircular is cold
But stream, left and right semicircle cooling flowing path passes through to be formed between cooling chamber dividing plate and cooling chamber base plate the left cooling flowing path being connected
Hole and right cooling flowing path hole.
Further improvement of the invention is that the cooling first-class even angle of cavity wall rounded internal surface is disposed with some strips
Shape heat exchange fin.
Further improvement of the invention is that inner chamber body is circular cylindrical cavity, and outer chamber is annular cavity.
The present invention has following beneficial effect：
A kind of pressure sensor cooling device suitable for hot environment test proposed by the present invention, using preliminary filling cold conditions nitrogen
Gas and water is cold and the method for fin heat exchange, can be effectively isolated the tested working medium of high temperature and is in contact with pressure sensor, while strengthening
Heat of the tested working medium of high temperature in stream is measured scatters and disappears, it is therefore prevented that pressure sensor measurement end face is subject to tested high temperature refrigerant
Thermal shock is acted on, and improves the acclimation to heat ability of sensor.
Further, the installation site of nitrogen supply pipe is higher than temperature sensor mounting seat, and this is mainly due to tested working medium
Upper end is flowed to from cooling device lower end, when temperature sensor experiences tested Temperature of Working to transfinite, nitrogen cut-off is opened at once
Valve, cooling nitrogen is filled with sensor measurement end, can effectively prevent the tested working medium feeler measuring cell of high temperature.In addition it is set
The fluid working substance temperature point of meter can monitor the real time temperature of pressure sensor measurement end fluid working substance, facilitate user to grasp pressure
The real-time working environment of sensor, and effective test data can be provided for pressure sensor damages the reason for failing analysis.
Further, nitrogen supply pipe and nitrogen stop valve, previously-introduced before experimental test can be slightly above test environment pressure
The cold conditions nitrogen of power, has by cold conditions nitrogen stream, the cold conditions nitrogen being pre-filled with test pipeline are blocked during beginning to be tested
Effect prevents direct thermal shock effect of the high temperature refrigerant to sensor, improves the hot adaptability of pressure sensor.
Further, the thread connecting mode of pressure guiding pipe facilitates removing and installing for pressure guiding pipe, is capable of achieving cooling device stagnation pressure
Or static pressure measurement function.
Further, cooling cavity wall is cooled down by the semicircle cooling flowing path in left and right, accelerates the tested working medium of high temperature
The heat for passing to cooling cavity wall scatters and disappears；The tested working medium of high temperature and cooling cavity wall are strengthened by strip heat exchange fin
Heat exchange efficiency.The above-mentioned cooling effectiveness that improve tested high temperature refrigerant, accelerates scattering and disappearing for tested working medium heat, shortens tested
The length of working medium impulse stream, improves the intrinsic dynamic characteristic of cooling device, reduces the pressure signal measured by sensor
With the amplitude-frequency and phase frequency difference between tested working medium true pressure signal, unstable state fluid working substance dynamic under hot environment is reduced
Pressure measurement errors.
Brief description of the drawings：
Fig. 1 is normal axomometric drawing of the screw thread mounting means pressure sensor cooling device with stagnation pressure pressure guiding pipe of the present invention；
Fig. 2 a are the top views of the pressure sensor cooling device shown in Fig. 1, and Fig. 2 b are the A-A of Fig. 2 a to sectional view；
Fig. 3 a are the front views of the pressure sensor cooling device shown in Fig. 1, and Fig. 3 b are the A-A of Fig. 3 a to sectional view, figure
3c is the B-B direction sectional view of Fig. 3 a；
Fig. 4 is normal axomometric drawing of the flange mounting means pressure sensor cooling device with stagnation pressure pressure guiding pipe of the present invention；
Fig. 5 is front view of the pressure sensor cooling device with static pressure pressure guiding pipe of the present invention.
In figure：1st, cooling water inlet pipe；2nd, sensor installation seat；3rd, cooling water outlet pipe；4th, temperature sensor mounting seat；
5th, cooling device mounting seat；6th, heat exchange structure is cooled down；7th, pressure guiding pipe；8th, nitrogen supply pipe；9th, nitrogen stop valve；10th, cool down
Chamber dividing plate；11st, exchange heat fin；12nd, cavity outer wall is cooled down；13rd, cavity wall is cooled down；14th, cooling chamber base plate；15th, cooling chamber cover plate；
16th, left semicircle shape cooling flowing path；17th, right semicircular cooling flowing path；18th, left cooling flowing path hole；19th, right cooling flowing path hole；20th, quilt
Survey working medium stream.
Specific embodiment：
With reference to the accompanying drawings and examples to further detailed description of the invention.
Fig. 1 to Fig. 5 is referred to, dress is cooled down the invention discloses a kind of pressure sensor suitable for hot environment test
Put, including cooling water inlet pipe 1, sensor installation seat 2, cooling water outlet pipe 3, temperature sensor mounting seat 4, cooling device peace
Dress seat 5, cooling heat exchange structure 6, pressure guiding pipe 7 and nitrogen supply pipe 8.
Refer to Fig. 2 a to Fig. 3 c, the cooling heat exchange structure 6, by cooling cavity outer wall 12, cooling cavity wall 13, heat exchange
Fin 11, cooling chamber dividing plate 10, cooling chamber base plate 14, cooling chamber cover plate 15 are constituted.In circle cooling cavity outer wall 12 and cooling chamber
Wall 13 is in concentric arrangement, cooling cavity outer wall 12, cooling cavity wall 13, shape between cooling chamber base plate 14 and cooling chamber cover plate 15
Into the cooled chamber dividing plate 10 of cooling annular space be averagely divided into left semicircle shape cooling flowing path 16 and right semicircular cooling flowing path
17, left and right semicircle cooling flowing path by between cooling chamber dividing plate 10 and cooling chamber base plate 14 formed left cooling flowing path hole 18 and
Right cooling flowing path hole 19 is connected.Strip heat exchange fin 11 is angularly evenly arranged in the cooling rounded internal surface of cavity wall 13
On, to lift the cooling effectiveness of the high-temperature medium in the tested working medium stream 20 that cooling cavity wall 13 is formed.Cooling cavity wall
13 inner surface near the side of cooling chamber base plate 14 is designed to female thread structure, to facilitate the impulse of the multi-forms such as stagnation pressure, static pressure
Pipe 7 is removed and installed.
The cooling water inlet pipe 1 is connected by cooling chamber cover plate 15 with left semicircle shape cooling flowing path 16, sensor peace
The bore design for filling seat 2 is screwed hole, and aperture and axle center are identical with cooling cavity wall 13, and it passes through cooling chamber cover plate 15 with cooling
The endoporus of cavity wall 13 is connected.Cooling water outlet pipe 3 and cooling water inlet pipe 1 are centrosymmetric arrangement, and by cooling chamber lid
Plate 15 is connected with right semicircular cooling flowing path 17.The bore design of temperature sensor mounting seat 4 has screw thread, to facilitate temperature to pass
The installation of sensor, it passes through cooling cavity outer wall 12, left semicircle shape cooling flowing path 16 and cooling cavity wall 13 and tested working medium stream
Road 20 is connected.For convenience of the installation of the pressure sensor cooling device, cooling device is designed with cooling cavity outer wall 12
Mounting seat 5, it has flange and screw thread to install two kinds of forms.Pressure guiding pipe 7 is by cooling down the internal face screw thread of cavity wall 13 and tested work
Mass flow road 20 is connected, and it is designed with two kinds of stagnation pressure pressure guiding pipe and static pressure pressure guiding pipe, is respectively used for measuring the stagnation pressure of tested working medium
And static pressure.Nitrogen supply pipe 8 is through cooling cavity outer wall 12, right semicircular cooling flowing path 17 and cooling cavity wall 13 and tested work
Mass flow road 20 is connected, and its position is higher than temperature sensor mounting seat 4, and nitrogen stop valve is designed with nitrogen supply pipe 8
9, the supply for controlling cooling nitrogen.
Embodiment：
The 80mm long of heat exchange structure 6 is cooled down in the present embodiment, cooling cavity outer wall 12 is in concentric cloth with cooling cavity wall 13
Put, cool down cavity outer wall 12 external diameter 25mm, internal diameter 21mm, wall thickness 2mm, cool down cavity wall 13 external diameter 9mm, internal diameter 5mm, wall thickness 2mm,
M6 × 0.5 standard female of 15mm long, cooling are designed with inner surface of the cooling cavity wall 13 away from the end of cooling chamber base plate 14
Bottom of chamber plate 14 and the wall thickness 2mm of cooling chamber cover plate 15；Cooling chamber dividing plate 10 70mm long, thick 2mm, with cooling cavity outer wall 12 and cooling chamber
Inwall 13 is connected, and will cool down the annular space formed between cavity outer wall 12 and cooling cavity wall 13 and is divided into left semicircle shape cooling stream
Road 16 and right semicircular cooling flowing path 17；8 heat exchange fins 11 are angularly evenly arranged in the inner surface of cooling cavity wall 13, change
The thickness of hot fin 11 0.5mm, 1mm wide, 65mm long；Cooling water inlet pipe 1 external diameter 5mm, internal diameter 3mm, the external diameter of cooling water outlet pipe 3
5mm, internal diameter 3mm, the two arrangement that is centrosymmetric, and by cooling chamber cover plate 15 respectively with left semicircle shape cooling flowing path 16 and the right side
Semicircle cooling flowing path 17 is connected；The external diameter 9mm of sensor installation seat 2,12mm high, Center is the through hole mark of M5 × 0.5
Quasi- internal thread, it is in concentric arrangement with cooling cavity wall 13, is connected with tested working medium stream 20 by cooling chamber cover plate 15；
Nitrogen supply pipe 8 external diameter 5mm, internal diameter 3mm, its axle center are 13mm from the distance between cooling chamber cover plate 15, nitrogen supply pipe 8 according to
It is secondary to be connected with tested working medium stream 20 through cooling cavity outer wall 12 and cooling cavity wall 13, designed simultaneously in nitrogen supply pipe 8
There is nitrogen stop valve 9, to control the supply of cold conditions nitrogen；The external diameter 10mm of temperature sensor mounting seat 4, internal diameter 6mm, construction section sets
In respect of the standard female of M6 × 1.0 of 15mm long, its axle center is 20mm, TEMP from the distance between cooling chamber cover plate 15
Device mounting seat 4 sequentially passes through cooling cavity outer wall 12 and cooling cavity wall 13 is connected with tested working medium stream 20；The external diameter of pressure guiding pipe 7
6mm, internal diameter 3mm, the upper end of pressure guiding pipe 7 are designed with M6 × 0.5 standard external of 15mm long, by screw thread by pressure guiding pipe 7 and cold
But heat exchange structure 6 is connected；Cooling device mounting seat 5 is designed with the standard external of M30 × 1.5 of 15mm long, cooling dress
The upper surface for putting the hex nut of mounting seat 5 is 35mm from the distance between cooling chamber cover plate 15.
The specific works mode that the present embodiment is applied to the pressure sensor cooling device of hot environment test is as follows：
Cooling water enters through cooling water inlet pipe 1 when pressure sensor cooling device suitable for hot environment test works
Left semicircle shape cooling flowing path 16, then by the left cooling flowing path hole 18 of formation between cooling chamber dividing plate 10 and cooling chamber base plate 14
And right cooling flowing path hole 19 enters right semicircular cooling flowing path 17, most flowed out through cooling water outlet pipe afterwards.The tested working medium of high temperature is straight
Connect and be in contact with cooling cavity wall 13 and heat exchange fin 11, the heat of the tested working medium of high temperature is mainly final by heat convection form
Cooling cavity wall 13 is passed to, heat exchange fin 11 improves the transmission efficiency of tested working medium heat because increased heat exchange area；
The heat for passing to cooling cavity wall 13 is mainly scattered and disappeared by cooling water with cooling cavity wall 13 outside wall surface heat convection, remaining
A part of heat then by cooling chamber dividing plate 10 by heat-conducting mode pass to cooling cavity outer wall 12, then by cooling cavity outer wall 12 with
Cooled external air and internal cooling water heat convection scatter and disappear.
Before pressure sensor is formally measured, nitrogen stop valve 9 is opened, and pressure is slightly above the cold conditions nitrogen warp of tested working medium
Nitrogen supply pipe 8 flows into tested working medium stream 20, is discharged through pressure guiding pipe 7 after being full of, nitrogen when pressure sensor is formally measured
Stop valve 9 is closed.Cold conditions nitrogen is pre-charged with tested working medium stream 20, pressure sensor is separated by with the tested working medium of high temperature
Open, it is to avoid pressure sensor is directly in contact with the tested working medium of high temperature, has preferable protective effect to sensor.Pressure is passed
When sensor starts measurement, the cold conditions nitrogen full of stagnation in tested working medium stream becomes a kind of good pressure fluctuation transmission and is situated between
Matter, and under the efficient cooling of cooling water, will maintain low-temperature condition for a long time, under being conducive to pressure sensor hot environment
Long-term measurement, improves the hot adaptability of pressure sensor.
Claims (10)
1. it is a kind of suitable for hot environment test pressure sensor cooling device, it is characterised in that including with hollow cavity
Cooling heat exchange structure (6), the hollow cavity of the cooling heat exchange structure (6) is divided into inside and outside two cavitys, and outer chamber quilt
At intervals of two parts of bottom connection, it is provided with the top of cooling heat exchange structure (6) cold with what a part of outer chamber was connected
But water inlet pipe (1), and the cooling water outlet pipe (3) being connected with another part outer chamber, is provided with the top of inner chamber body
Sensor installation seat (2), bottom is provided with pressure guiding pipe (7), and a part is provided through in the circumference of cooling heat exchange structure (6)
Outer chamber and the temperature sensor mounting seat (4) being connected with inner chamber body, and through another part outer chamber and and inner chamber body
The nitrogen supply pipe (8) being connected.
2. a kind of pressure sensor cooling device suitable for hot environment test according to claim 1, its feature exists
In the installation site of the installation site higher than temperature sensor mounting seat (4) of nitrogen supply pipe (8).
3. a kind of pressure sensor cooling device suitable for hot environment test according to claim 1, its feature exists
In, nitrogen stop valve (9) is additionally provided with nitrogen supply pipe (8), the supply of nitrogen is cooled down for control.
4. a kind of pressure sensor cooling device suitable for hot environment test according to claim 1, its feature exists
In, cooling heat exchange structure (6) circumference on be additionally provided with cooling device mounting seat (5).
5. a kind of pressure sensor cooling device suitable for hot environment test according to claim 4, its feature exists
In cooling device mounting seat (5) installs two kinds of forms using flange and screw thread.
6. a kind of pressure sensor cooling device suitable for hot environment test according to claim 1, its feature exists
In pressure guiding pipe (7) uses two kinds of stagnation pressure pressure guiding pipe and static pressure pressure guiding pipe, is respectively used for measuring the stagnation pressure and static pressure of tested working medium.
7. a kind of pressure sensor cooling device suitable for hot environment test according to claim 1, its feature exists
In sensor installation seat (2) is connected through a screw thread the top for being arranged on inner chamber body, and pressure guiding pipe (7) is connected through a screw thread and is arranged on
The bottom of inner chamber body.
8. a kind of pressure sensor cooling device suitable for hot environment test according to claim 1, its feature exists
In cooling cavity outer wall (12) and cooling cavity wall (13) of cooling heat exchange structure (6) including concentric arrangement are arranged on cooling
Cooling chamber cover plate (15) at the top of cavity outer wall (12) top and cooling cavity wall (13), and it is arranged on cooling cavity outer wall (12) bottom
Portion and cooling cavity wall (13) bottom cooling chamber base plate (14), wherein, cooling cavity wall (13) with cooling chamber cover plate (15) and
Form inner chamber body between cooling chamber base plate (14), cooling cavity outer wall (12) and cooling cavity wall (13) and cooling chamber cover plate (15) and
Cooling chamber base plate forms outer chamber between (14), and by cooling chamber dividing plate (10) at intervals of two parts, a part is the outer chamber
Left semicircle shape cooling flowing path (16), another part is right semicircular cooling flowing path (17), and left and right semicircle cooling flowing path is by cold
But the left cooling flowing path hole (18) and right cooling flowing path hole being connected are formed between chamber dividing plate (10) and cooling chamber base plate (14)
(19)。
9. a kind of pressure sensor cooling device suitable for hot environment test according to claim 8, its feature exists
In cooling cavity wall (13) first-class even angle of rounded internal surface is disposed with some strips heat exchange fin (11).
10. a kind of pressure sensor cooling device suitable for hot environment test according to claim 8, its feature exists
In inner chamber body is circular cylindrical cavity, and outer chamber is annular cavity.
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| CN201710090844.3A CN106706204B (en) | 2017-02-20 | 2017-02-20 | Pressure sensor cooling device suitable for high temperature environment test |
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| CN201710090844.3A CN106706204B (en) | 2017-02-20 | 2017-02-20 | Pressure sensor cooling device suitable for high temperature environment test |
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| CN106706204B CN106706204B (en) | 2022-06-21 |
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Cited By (6)
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| CN108106774A (en) * | 2017-11-28 | 2018-06-01 | 北京航天发射技术研究所 | A kind of optimization method of gas flow field pressure measuring device parameter |
| CN109404163A (en) * | 2018-12-13 | 2019-03-01 | 西安航天动力研究所 | Measure the device and method that scramjet combustor gaseous film control covers interior flow velocity |
| CN109632866A (en) * | 2018-12-20 | 2019-04-16 | 中国空气动力研究与发展中心超高速空气动力研究所 | A kind of water-cooled sample holder in high-enthalpy flow |
| CN109799030A (en) * | 2018-12-20 | 2019-05-24 | 中国空气动力研究与发展中心超高速空气动力研究所 | A kind of water-cooled pressure measurement probe suitable for high-enthalpy flow |
| CN111562082A (en) * | 2020-05-22 | 2020-08-21 | 北京中科宇航技术有限公司 | Unsteady state pulsating pressure test system under high temperature environment |
| CN115219100A (en) * | 2022-09-21 | 2022-10-21 | 中国空气动力研究与发展中心空天技术研究所 | Total pressure measuring structure of combustion heater |
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