CN114320669A - Variable-structure height compensating spray pipe experimental device - Google Patents
Variable-structure height compensating spray pipe experimental device Download PDFInfo
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- CN114320669A CN114320669A CN202111577913.6A CN202111577913A CN114320669A CN 114320669 A CN114320669 A CN 114320669A CN 202111577913 A CN202111577913 A CN 202111577913A CN 114320669 A CN114320669 A CN 114320669A
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Abstract
The invention discloses a variable-structure height compensating spray pipe experiment device, and belongs to the field of engine spray pipe experiments. Mainly by steady voltage storehouse, bottom plate, apron, variable structure expansion section, pivot, sealing strip, push rod, slider track, slider, pressure measurement tubular metal resonator, pressure measurement hose, actuating mechanism, pressure sensor, displacement sensor, drive power sensor constitute. The pressure stabilizing bin is used for reducing the speed and stabilizing the pressure of the incoming flow gas so as to measure the total pressure of the incoming flow gas. The air tightness of the variable-structure height compensation spray pipe experiment device is guaranteed by adjusting the outlet area of the spray pipe through rotation of the multiple expansion sections around the rotating shaft and arranging the sealing strips according to structural characteristics between the expansion sections and the bottom plate, the cover plate and the rotating shaft, and then real-time test of the variable-structure height compensation spray pipe experiment is guaranteed, and the real-time test parameters comprise expansion section angles, wall surface pressure distribution and execution mechanism loads. According to the invention, the angle of each variable structure expansion section can be adjusted in place only by moving the transverse position of the push rod through the driving mechanism, so that the experimental efficiency is improved.
Description
Technical Field
The invention relates to a variable structure spray pipe experiment device, and belongs to the field of engine spray pipe experiments.
Background
The Laval nozzle is one of the important components of the rocket engine and has the function of converting subsonic gas in a combustion chamber into supersonic jet flow so as to provide thrust. With conventional rocket engine nozzles, the expansion ratio, i.e., the exit area, is fixed, and therefore during ascent of the rocket, the nozzle typically experiences three operating conditions — over-expansion, full expansion, and under-expansion, with a loss of performance occurring when the nozzle is in either the over-expanded or under-expanded condition, which is referred to as an adaptive loss.
In order to reduce the non-adaptive losses of the nozzle, researchers have proposed various forms of height compensating nozzles. The variable-structure height compensation spray pipe is one of the variable-structure height compensation spray pipes, and is characterized in that the area of an outlet of the spray pipe can be actively adjusted along with the change of the working height of a rocket. The technical personnel in the field are dedicated to designing an experimental device of the variable-structure height compensating nozzle, which is mainly used for relevant research of the variable-structure height compensating nozzle. The experimental device has the advantages that the continuous change of the area of the outlet of the spray pipe can be realized, and various parameters including the angle of the expansion section, the wall surface pressure distribution and the load of the actuating mechanism can be monitored in real time.
Disclosure of Invention
The invention aims to provide a variable-structure height compensation spray pipe experimental device, which regulates and controls the outlet area of a spray pipe by rotating a plurality of expansion sections around a rotating shaft, arranges sealing strips according to the structural characteristics between the expansion sections and a bottom plate, a cover plate and the rotating shaft, ensures the air tightness of the variable-structure height compensation spray pipe experimental device, and further ensures the realization of real-time test of the variable-structure height compensation spray pipe experiment, wherein the real-time test parameters comprise the angle of the expansion sections, the wall surface pressure distribution and the load of an actuating mechanism.
The purpose of the invention is realized by the following technical scheme.
The invention discloses a variable-structure height compensation spray pipe experimental device which mainly comprises a pressure stabilizing bin, a bottom plate, a cover plate, a variable-structure expansion section, a rotating shaft, a sealing strip, a push rod, a slide block track, a slide block, a pressure measuring metal pipe, a pressure measuring hose, a driving mechanism, a pressure sensor, a displacement sensor and a driving force sensor. The pressure stabilizing bin is used for reducing the speed and stabilizing the pressure of the incoming flow gas, and the outer surface of the pressure stabilizing bin is provided with a hole for mounting a pressure sensor so as to measure the total pressure of the incoming flow gas. The bottom plate is provided with grooves for forming a spray pipe convergence section, a throat part and a fixed expansion section, the bottom plate is also provided with a blind hole for fixing a rotating shaft, and an arc-shaped groove for limiting the motion trail of the push rod, and the size, the position and the number of the arc-shaped groove are changed according to experiment requirements. The cover plate is provided with a hollow structure for leading out a pressure measuring hose, and the cover plate is also provided with a blind hole for fixing the rotating shaft. The cover plate is buckled on the bottom plate, an airflow channel is arranged between the cover plate and the bottom plate, and the inlet of the airflow channel is connected with the pressure stabilizing bin. The variable structure expansion section and the fixed expansion section are collectively called as an expansion section, and the expansion section is rotationally connected with the expansion section through a rotating shaft. The driving mechanism is used for driving the sliding rail to move transversely, driving the sliding block to move longitudinally to drive the push rod to move, driving the variable structure expansion section to rotate around the rotating shaft by moving the push rod, changing the quantity and the length of the variable structure expansion section according to experiment demands, regulating and controlling the outlet area of the spray pipe by rotating the variable structure expansion section around the rotating shaft, and realizing the high compensation of the performance of the spray pipe by regulating and controlling the outlet area of the increased spray pipe. The displacement sensor is connected with the slide rail, and the transverse displacement of the slide rail is monitored in real time through the displacement sensor, so that the transverse displacement of the slide block is obtained, the rotation angle of the variable structure expansion section can be deduced according to the transverse displacement of the slide block, and the high-efficiency accurate regulation and control of the outlet area of the spray pipe are realized. The slider is connected with the drive force sensor, can real-time supervision slider receive drive force when the slider displacement. Sealing strips are arranged between the fixed expansion section and the variable structure expansion section, between the variable structure expansion section and the variable structure expansion section, and between the variable structure expansion section and the bottom plate and the cover plate, so that the integral air tightness of the spray pipe is ensured. The variable structure expansion section is provided with pressure measuring holes, and the number and the positions of the pressure measuring holes are changed according to the pressure measuring requirements. The pressure measuring metal pipe is welded on the outer wall surface of the expansion section and corresponds to the pressure measuring hole, and the other end of the pressure measuring metal pipe is connected with the pressure measuring hose so as to lead out and measure the pressure of the inner wall surface of the variable structure expansion section.
Sealing strips are arranged between the fixed expansion section and the variable structure expansion section, between the variable structure expansion section and the variable structure expansion section, and between the variable structure expansion section and the bottom plate and the cover plate, so that the air tightness of the spray pipe expansion section is ensured. Preferably, a first sealing strip and a second sealing strip are arranged between the fixed expansion section and the variable structure expansion section. The sealing starting point of the first sealing strip is located at the outlet of the lower wall face of the spray pipe, and the first sealing strip sequentially bypasses the lower wall face of the throat part of the spray pipe, the lower wall face of the convergence section, the inlet of the airflow channel, the upper wall face of the convergence section, the upper wall face of the throat part, the front face of the variable structure expansion section, the side face of the variable structure expansion section and the back face of the variable structure expansion section to realize sealing. The second sealing strip is used for fixing the rotary seal between the expansion section and the variable structure expansion section. The third sealing strip walks around the front surface of the variable structure expansion section, the side surface of the variable structure expansion section and the back surface of the variable structure expansion section in sequence, so that sealing between the variable structure expansion section and the bottom plate and between the variable structure expansion section and the cover plate can be realized, and sealing between the variable structure expansion section and the variable structure expansion section during closing can also be realized, so that the air tightness of the spray pipe expansion section is ensured. The number of the third sealing strips is determined by the number of the variable structure expansion sections, and the number of the third sealing strips is 1 less than that of the variable structure expansion sections.
The expansion section, the rotating shaft, the arc-shaped groove and the push rod form a plane mechanism, and the calculation method of the degree of freedom of the plane mechanism is that F is 3n-2PL-PHWherein: n is the number of movable parts, PLIs a low number of secondary constraints, PHIs a high number of secondary constraints. The restraint is set according to variable structure expansion section quantity, makes mechanism degree of freedom F become 1 for, then only need remove the push rod lateral position through actuating mechanism, just can target in place every variable structure expansion section angle modulation, improves experimental efficiency.
The invention discloses a working method of a variable-structure height compensating spray pipe experimental device, which comprises the following steps:
compressed gas is after the steady voltage storehouse speed reduction steady voltage, get into the airflow channel between bottom plate and apron, form stable supersonic velocity air current after, actuating mechanism begins work, actuating mechanism is used for driving slide rail lateral shifting, drive slider longitudinal movement, slider longitudinal movement drives the push rod and removes, the push rod removes and drives the variable structure expansion section and revolutes the rotation of axes, change the quantity and the length of variable structure expansion section according to the experiment demand, revolute axes through the variable structure expansion section and rotate regulation and control spray tube exit area, realize spray tube performance height compensation through regulation and control spray tube exit area. The slider is connected with the drive force sensor, through drive force sensor drive power that the slider received can real-time supervision in the slider displacement. The transverse driving displacement of the driving mechanism is monitored in real time through the displacement sensor, so that the transverse displacement of the sliding block and the push rod is obtained, the rotating angle of the variable structure expansion section can be deduced according to the transverse displacement of the push rod, and the efficient and accurate regulation and control of the outlet area of the spray pipe are realized. The pressure measuring metal pipe is welded on the outer wall surface of the expansion section and corresponds to the pressure measuring hole, the other end of the pressure measuring metal pipe is connected with the pressure measuring hose, and the pressure of the inner wall surface of the variable structure expansion section is led out to the pressure sensor through the pressure measuring metal pipe and the pressure measuring hose in sequence to realize pressure measurement.
Has the advantages that:
1. according to the variable-structure height compensation spray pipe experiment device disclosed by the invention, the outlet area of the spray pipe is regulated and controlled by rotating the multiple expansion sections around the rotating shaft, sealing is realized according to the structural characteristics between the variable-structure expansion sections and the bottom plate, the cover plate and the rotating shaft, the air tightness of the variable-structure height compensation spray pipe experiment device is ensured, and further the real-time test of the variable-structure height compensation spray pipe experiment is ensured, wherein the real-time monitoring parameters comprise the expansion section angle, the wall surface pressure distribution and the load of an actuating mechanism.
2. The invention discloses a variable-structure height compensating nozzle experimental device which realizes sealing according to the structural characteristics between an expansion section and a rotating shaft, a bottom plate, a cover plate and a rotating shaft, wherein a first sealing strip and a second sealing strip are arranged between a fixed expansion section and a variable-structure expansion section. The sealing starting point of the first sealing strip is located at the outlet of the lower wall surface of the spray pipe, and the first sealing strip sequentially bypasses the throat part of the spray pipe, the lower wall surface of the convergence section, the inlet of the airflow channel, the upper wall surface of the convergence section, the front surface of the variable structure expansion section and the back surface of the variable structure expansion section to realize sealing. The second sealing strip is used for sealing and fixing the rotary seal between the expansion section and the variable structure expansion section.
3. The invention discloses a variable-structure height compensating nozzle experimental device, wherein a third sealing strip is used for sealing and fixing the rotary seal between an expansion section and a variable-structure expansion section. The third sealing strip walks around the front surface of the variable structure expansion section and the back surface of the variable structure expansion section in sequence, can realize the sealing between the variable structure expansion section and the bottom plate and the cover plate, and can also realize the sealing between the variable structure expansion section and the variable structure expansion section when the variable structure expansion section is closed, so as to ensure the air tightness of the spray pipe expansion section.
4. According to the variable-structure height compensation spray pipe experimental device disclosed by the invention, the angle of each variable-structure expansion section can be adjusted in place only by moving the transverse position of the push rod through the driving mechanism, so that the experimental efficiency is improved.
5. The experimental device for the variable-structure height compensating spray pipe disclosed by the invention can monitor the wall surface pressure distribution and the load of the actuating mechanism in the deformation process of the variable-structure spray pipe in real time, thereby providing reference for the design and development of the variable-structure height compensating spray pipe.
Drawings
FIG. 1 is a rear view of the structure of an experimental apparatus of a variable-structure height compensating nozzle of the present invention;
FIG. 2 is a simplified front view of the device of the present invention;
FIG. 3 is a schematic view of the structure of the expansion segment of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 2 of the present invention;
FIG. 5 is a schematic diagram of the end state of the present invention;
FIG. 6 is a schematic of the driving force measurement of the present invention;
FIG. 7 is a schematic view of wall pressure measurement according to the present invention.
Wherein: 1-pressure stabilizing bin, 2-bottom plate, 3-cover plate, 4-variable structure expanding section, 5-rotating shaft, 6-sealing strip, 7-push rod, 8-slide block track, 9-slide block, 10-pressure measuring metal tube, 11-pressure measuring hose, 12-driving mechanism, 13-pressure sensor, 14-displacement sensor and 15-driving force sensor.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings and embodiments, so as to understand the objects, the features and the effects of the present invention.
As shown in fig. 1, the experimental apparatus for the variable-structure height compensation nozzle disclosed in this example comprises a pressure stabilizing bin 1, a bottom plate 2, a cover plate 3, a variable-structure expanding section 4, a rotating shaft 5, a sealing strip 6, a push rod 7, a slider rail 8, a slider 9, a pressure measuring metal pipe 10, a pressure measuring hose 11, a driving mechanism 12, a pressure sensor 13, a displacement sensor 14, and a driving force sensor 15.
The pressure stabilizing bin 1 is a pressure containing cavity with a certain volume and is used for reducing the speed and stabilizing the pressure of incoming gas. The pressure sensor 13 is arranged on the outer surface of the pressure stabilizing bin 1 through a hole to measure the total pressure of the incoming flow. As shown in FIG. 2, a square hole 22 is formed on the left side of the bottom plate, and the gas in the pressure stabilizing bin enters the nozzle convergent section from the square hole 22 and then is accelerated to supersonic velocity gas flow through a throat part 23 and is sprayed out towards the right side.
The number of the variable structure expansion sections is 2. First variable structure expansion section 41 rotates through pivot 5 and is connected with bottom plate 2, and first variable structure expansion section 41 is connected for rotating with second variable structure expansion section 42, and second variable structure expansion section 42 end links firmly with push rod 7, and the motion of push rod 7 is injectd in arc wall 21. Thus, the rotating shaft 5, the first variable structure expanding section 41, the second variable structure expanding section 42 and the arc-shaped groove 21 form a plane mechanism shown in fig. 3. According to the calculation method of the degree of freedom of the plane mechanism, F is 3n-2PL-PHThe mechanism movable member n is 3, and the number of pairs of restraint P is lowL4, high pair constraint number PHThe mechanical degree of freedom F is 0 and 1. Therefore, when the driving mechanism 12 pushes the push rod 7 to displace, the rotation angles of the first and second variable structure expanding sections 41 and 42 can be changed, and the rotation angles of the first and second variable structure expanding sections 41 and 42 are the only solutions. Fig. 2 is a schematic view showing the initial state of the experimental apparatus, and fig. 5 is a final state, in which the nozzle is deformed and the expansion ratio is maximized.
As shown in fig. 2 and 4, the sealing starting point of the first sealing strip 61 is located at the outlet of the lower wall surface of the nozzle, and the first sealing strip 61 sequentially bypasses the lower wall surface of the throat part of the nozzle, the lower wall surface of the convergent section, the inlet of the airflow channel, the upper wall surface of the convergent section, the upper wall surface of the throat part, the front surface of the first variable structure expanding section 41, the side surface of the first variable structure expanding section 41 and the back surface of the first variable structure expanding section 41 to realize sealing. The second sealing strip 62 is used to secure the rotational seal between the diverging section and the first variable configuration diverging section 41. As shown in fig. 4, the third sealing strip sequentially bypasses the front surface of the second variable structure expansion section 42, the side surface of the second variable structure expansion section 42 and the back surface of the second variable structure expansion section 42, so that sealing between the second variable structure expansion section 42 and the bottom plate 2 and the cover plate 3 can be realized, and sealing between the first variable structure expansion section 41 and the second variable structure expansion section 42 during closing can be realized, so as to ensure air tightness between the variable structure expansion sections of the nozzle.
As shown in fig. 1 and 6, the main body of the slider 9 is a slider base 91, one side of which is connected to 4 bearings 93 by cylindrical pins, and the other side of which is fixedly connected to the driving force sensor 15. A through hole is arranged in the middle of the sliding block base 91, and a bearing 92 is placed in the through hole and then is rotatably connected with the push rod 7. One side of the slider track 8 is provided with a groove 81 for limiting the direction of movement of the slider. The slider rail 8 is fixedly connected with the moving platform 121 of the driving mechanism 12, so that the up-and-down movement of the slider 9 can be controlled when the moving platform 121 moves left and right. The movable platform 121 is connected with the displacement sensor 14, so that the transverse displacement of the movable platform 121 can be monitored in real time, the transverse displacement of the push rod 7 can be obtained, and then the rotation angles of the first variable structure expansion section 41 and the second variable structure expansion section 42 can be calculated.
As shown in FIG. 7, the variable structure expanding section 4 is provided with a plurality of pressure measuring holes 421, and the pressure measuring holes 421 are through holes with the diameter of 1 mm. The other side of the pressure measuring hole 421 is connected with the pressure measuring metal tube 10. The pressure measuring hose 11 is sleeved on the pressure measuring metal tube 10, the inner diameter of the pressure measuring hose 11 is smaller than the outer diameter of the pressure measuring metal tube 10, and the sealing effect is achieved by the elasticity of the pressure measuring hose 11. The other side of the pressure hose 11 is connected to a pressure sensor, so that the pressure on the inner surface of the variable structure expansion section is led out and can be measured.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. The utility model provides a variable structure height compensation spray tube experimental apparatus which characterized in that: the pressure-measuring device mainly comprises a pressure-stabilizing bin, a bottom plate, a cover plate, a variable structure expansion section, a rotating shaft, a sealing strip, a push rod, a slide block track, a slide block, a pressure-measuring metal pipe, a pressure-measuring hose, a driving mechanism, a pressure sensor, a displacement sensor and a driving force sensor; the pressure stabilizing bin is used for reducing the speed and stabilizing the pressure of the incoming flow gas, and the outer surface of the pressure stabilizing bin is provided with a hole for mounting a pressure sensor so as to measure the total pressure of the incoming flow gas; grooves for forming a spray pipe convergence section, a throat part and a fixed expansion section are processed on the bottom plate, blind holes for fixing a rotating shaft and arc-shaped grooves for limiting the motion trail of the push rod are further processed on the bottom plate, and the size, position and number of the arc-shaped grooves are changed according to experimental requirements; a hollow structure for leading out a pressure measuring hose is processed on the cover plate, and a blind hole for fixing the rotating shaft is also processed on the cover plate; the cover plate is buckled on the bottom plate, an airflow channel is arranged between the cover plate and the bottom plate, and the inlet of the airflow channel is connected with the pressure stabilizing bin; the variable structure expansion section and the fixed expansion section are collectively called as an expansion section, and the expansion section is rotationally connected with the expansion section through a rotating shaft; the driving mechanism is used for driving the sliding rail to move transversely and driving the sliding block to move longitudinally, the sliding block moves longitudinally and drives the push rod to move, the push rod moves to drive the variable structure expansion section to rotate around the rotating shaft, the number and the length of the variable structure expansion section are changed according to experimental requirements, the outlet area of the spray pipe is regulated and controlled through the rotation of the variable structure expansion section around the rotating shaft, and the outlet area of the spray pipe is increased through regulation and control to realize the performance height compensation of the spray pipe; the displacement sensor is connected with the slide rail, the transverse displacement of the slide rail is monitored in real time through the displacement sensor, so that the transverse displacement of the slide block is obtained, the rotation angle of the variable structure expansion section can be deduced according to the transverse displacement of the slide block, and the high-efficiency and accurate regulation and control of the outlet area of the spray pipe are realized; the sliding block is connected with the driving force sensor, and the driving force applied to the sliding block can be monitored in real time while the sliding block is displaced; sealing strips are arranged between the fixed expansion section and the variable structure expansion section, between the variable structure expansion section and the variable structure expansion section, and between the variable structure expansion section and the bottom plate and the cover plate, so that the integral air tightness of the spray pipe is ensured; the variable structure expansion section is provided with pressure measuring holes, and the number and the positions of the pressure measuring holes are changed according to the pressure measuring requirement; the pressure measuring metal pipe is welded on the outer wall surface of the expansion section and corresponds to the pressure measuring hole, and the other end of the pressure measuring metal pipe is connected with the pressure measuring hose so as to lead out and measure the pressure of the inner wall surface of the variable structure expansion section.
2. The variable-structure height compensating nozzle experimental device as claimed in claim 1, wherein: sealing strips are arranged between the fixed expansion section and the variable structure expansion section, between the variable structure expansion section and the variable structure expansion section, and between the variable structure expansion section and the bottom plate and the cover plate, so that the air tightness of the expansion section of the spray pipe is ensured; a first sealing strip and a second sealing strip are arranged between the fixed expansion section and the variable structure expansion section; the sealing starting point of the first sealing strip is positioned at the outlet of the lower wall surface of the spray pipe, and the first sealing strip sequentially bypasses the lower wall surface of the throat part of the spray pipe, the lower wall surface of the convergence section, the inlet of the airflow channel, the upper wall surface of the convergence section, the upper wall surface of the throat part, the front surface of the variable structure expansion section, the side surface of the variable structure expansion section and the back surface of the variable structure expansion section to realize sealing; the second sealing strip is used for fixing the rotary seal between the expansion section and the variable structure expansion section; the third sealing strip sequentially bypasses the front surface of the variable structure expansion section, the side surface of the variable structure expansion section and the back surface of the variable structure expansion section, so that the sealing among the variable structure expansion section, the bottom plate and the cover plate can be realized, and the sealing between the variable structure expansion section and the variable structure expansion section during closing can be realized, so that the air tightness of the spray pipe expansion section is ensured; the number of the third sealing strips is determined by the number of the variable structure expansion sections, and the number of the third sealing strips is 1 less than that of the variable structure expansion sections;
the expansion section, the rotating shaft, the arc-shaped groove and the push rod form a plane mechanism, and the calculation method of the degree of freedom of the plane mechanism is that F is 3n-2PL-PHWherein: n is the number of movable parts, PLIs a low number of secondary constraints, PHA high pair constraint number; the restraint is set according to variable structure expansion section quantity, makes mechanism degree of freedom F become 1 for, then only need remove the push rod lateral position through actuating mechanism, just can target in place every variable structure expansion section angle modulation, improves experimental efficiency.
3. The variable-structure height compensating nozzle experimental device as claimed in claim 1 or 2, wherein: the working method is that,
compressed gas enters an air flow channel between the bottom plate and the cover plate after being subjected to speed reduction and pressure stabilization through the pressure stabilization bin, a driving mechanism starts to work after stable supersonic air flow is formed, the driving mechanism is used for driving the sliding rail to transversely move and driving the sliding block to longitudinally move, the sliding block longitudinally moves and drives the push rod to move, the push rod moves and drives the variable structure expansion section to rotate around the rotating shaft, the number and the length of the variable structure expansion section are changed according to experimental requirements, the outlet area of the spray pipe is regulated and controlled through the rotation of the variable structure expansion section around the rotating shaft, and the performance height compensation of the spray pipe is realized through regulating and controlling the outlet area of the spray pipe; the sliding block is connected with a driving force sensor, and the driving force applied to the sliding block can be monitored in real time while the sliding block is displaced through the driving force sensor; the transverse driving displacement of the driving mechanism is monitored in real time through a displacement sensor, so that the transverse displacement of the sliding block and the push rod is obtained, the rotation angle of the variable structure expansion section can be deduced according to the transverse displacement of the push rod, and the high-efficiency and accurate regulation and control of the outlet area of the spray pipe are realized; the pressure measuring metal pipe is welded on the outer wall surface of the expansion section and corresponds to the pressure measuring hole, the other end of the pressure measuring metal pipe is connected with the pressure measuring hose, and the pressure of the inner wall surface of the variable structure expansion section is led out to the pressure sensor through the pressure measuring metal pipe and the pressure measuring hose in sequence to realize pressure measurement.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115585073A (en) * | 2022-08-31 | 2023-01-10 | 中国航发四川燃气涡轮研究院 | Testing device for dynamic sealing performance of metal elastic sealing structure |
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| GB1177490A (en) * | 1967-08-29 | 1970-01-14 | Carroll Edwin Johnson | Methods and Apparatus for Detecting Variations in Gross Momentum Thrusts |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115585073A (en) * | 2022-08-31 | 2023-01-10 | 中国航发四川燃气涡轮研究院 | Testing device for dynamic sealing performance of metal elastic sealing structure |
| CN115585073B (en) * | 2022-08-31 | 2024-04-16 | 中国航发四川燃气涡轮研究院 | Test device for dynamic sealing performance of metal elastic sealing structure |
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