A device for measuring the self-pulsating pressure of a jet

Abstract

The present application relates to the technical fields of jet pulsating pressure measurement test, in particular to a device for measuring jet self-pulsating pressure. The left end of the storage chamber of the device for measuring jet self-pulsating pressure is left with a high-pressure gas source connecting port, the upper end of the storage chamber is connected with the lower end of the nozzle, and the storage chamber and the nozzle are sealingly connected; the side wall of the storage chamber is provided with a pulsating pressure sensor and a pressure gauge, and the side wall of the outlet of the nozzle is provided with a pulsating pressure sensor. The storage chamber and the nozzle can be disassembled and combined, and by replacing different nozzles or different storage chambers, various measurement targets can be achieved. The present application provides a device independent of the test model, the device adopts a storage chamber and a nozzle with a cavity profile consistent with the test model, and the structure and connection mode of the two are carefully designed, the pulsating pressure sensors are installed on the side wall of the storage chamber and the side wall of the outlet of the nozzle, and the problem that it is difficult to arrange sensors on the model to separately measure the jet self-pulsating pressure in the jet pulsating pressure measurement test is solved.

Description

Technical Field

[0001] This invention relates to the field of jet pulsation pressure measurement and testing technology, and in particular to a device for measuring the pulsation pressure of a jet itself. Background Technology

[0002] In order to quickly transfer the spacecraft carrying astronauts to a safe area in an emergency, the escape tower of a manned spacecraft is generally equipped with a high-thrust engine. The jet of the high-thrust engine and the incoming airflow will generate strong interference, which will affect the spacecraft cabin located behind the escape engine, inducing a series of problems such as structural vibration of the spacecraft cabin and internal noise of the spacecraft cabin. These issues are related to the comfort and safety of the astronauts. Therefore, special attention needs to be paid to the aerodynamic noise of the escape system during the entire design and development process.

[0003] Wind tunnel testing is an effective means of studying aerodynamic problems. In wind tunnel testing, pulsating pressure sensors are usually placed on the surface of the model to measure aerodynamic noise. For test models with jets, such as the escape tower of a manned spacecraft, whether cold or hot jets are used to simulate the actual engine jets, the pressure in the model's storage chamber and the nozzle outlet pressure are not absolutely stable when the jet system is working. This means that the measured pulsating pressure signal already contains the pulsating pressure component of the jet itself, and it is difficult to place sensors on the model to measure the jet's own pulsating pressure separately during the test.

[0004] Therefore, in order to understand the jet's own pulsating pressure and eliminate its influence on the test results, it is necessary to design a jet's own pulsating pressure measuring device that is independent of the test model and can measure the jet's own pulsating pressure independently. Such a device can be widely used in pulsating pressure measurement tests with jets. Summary of the Invention

[0005] The purpose of this invention is to provide an apparatus for measuring the pulsating pressure of a jet stream, which can acquire the pulsating pressure of the jet stream inside the reservoir and at the nozzle outlet, providing information on the pulsating pressure of the jet stream itself for pulsating pressure measurement tests with a jet stream.

[0006] The present invention provides a device for measuring the pulsating pressure of a jet stream, comprising a reservoir, a nozzle, a pulsating pressure sensor, and a pressure gauge;

[0007] The left end of the storage chamber has a high-pressure gas source connection port, the upper end of the storage chamber is connected to the lower end of the nozzle, and the storage chamber and the nozzle are sealed together.

[0008] A pulsating pressure sensor and a pressure gauge are installed on the side wall of the storage chamber, and a pulsating pressure sensor is installed on the side wall of the nozzle outlet.

[0009] Preferably, the storage chamber and the nozzle are sealed by a sealing gasket.

[0010] Preferably, the high-pressure gas source connection port left at the left end of the storage chamber is used to connect to the jet gas supply system;

[0011] The upper end of the storage chamber is provided with an opening that communicates with the nozzle, and a trapezoidal groove is provided around the opening.

[0012] Preferably, the lower end of the nozzle is connected to the upper end of the storage chamber, the nozzle is fastened to the storage chamber by bolts, and a trapezoidal groove is provided around the nozzle inlet on the lower end surface of the nozzle.

[0013] Preferably, the sealing gasket has an arc-shaped cross-section at both the top and bottom.

[0014] The upper and lower ends of the sealing gasket are respectively embedded in the trapezoidal grooves reserved on the storage chamber and the nozzle.

[0015] Preferably, the storage chamber and the nozzle are made of stainless steel, and the sealing gasket is made of copper.

[0016] Preferably, the internal cavity shape of the storage chamber and the nozzle must be consistent with the test model.

[0017] Preferably, the pulsating pressure sensor is installed in a pre-drilled mounting hole on the side wall of the reservoir and the side wall of the nozzle outlet, with the axis of the pulsating pressure sensor along the normal direction of the measuring point wall.

[0018] Preferably, it includes multiple different nozzles and multiple different storage chambers;

[0019] The different nozzles and the different reservoirs can be disassembled and assembled.

[0020] Preferably, the pressure gauge is connected to the storage chamber via a pressure-conducting pipeline.

[0021] Beneficial effects:

[0022] This invention provides a device independent of the test model. The device uses a storage chamber and a nozzle with an internal cavity surface that are consistent with the test model. The structure and connection method of the two are carefully designed. Pulsating pressure sensors are installed on the side wall of the storage chamber and the side wall of the nozzle outlet, which solves the problem that it is difficult to place sensors on the model to measure the pulsating pressure of the jet itself in the pulsating pressure measurement test with jet. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the device for measuring the pulsating pressure of a jet stream, provided for a specific embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Storage chamber; 2. Nozzle; 3. Sealing gasket; 4. First pulsating pressure sensor; 5. Second pulsating pressure sensor; 6. Pressure gauge. Detailed Implementation

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] like Figure 1 As shown, this embodiment provides a device for measuring the pulsating pressure of a jet stream, including a reservoir 1, a nozzle 2, a sealing gasket 3, and a pulsating pressure sensor.

[0031] The storage chamber 1 has a high-pressure gas source connection port on the left end. The upper end of the storage chamber 1 is connected to the lower end of the nozzle 2. The storage chamber 1 and the nozzle 2 are sealed by the sealing gasket 3. A pulsating pressure sensor is installed on the side wall of the storage chamber 1 and the outlet side wall of the nozzle 2.

[0032] Furthermore, a high-pressure gas source connection port is provided at the left end of the storage chamber 1 for connecting to the jet gas supply system. The upper end of the storage chamber 1 is provided with an opening that communicates with the nozzle 2, and a trapezoidal groove is provided around the opening.

[0033] In some embodiments of the present invention, the jet air supply system connected to this device is consistent with the jet air supply system used in the jet model in the wind tunnel test.

[0034] Furthermore, the lower end of the nozzle 2 is connected to the upper end of the storage chamber 1, and the nozzle 2 is fastened to the storage chamber 1 by bolts. A trapezoidal groove is provided around the inlet of the nozzle 2 on the lower end surface of the nozzle 2.

[0035] In some embodiments of the present invention, the sealing gasket 3 has an arc-shaped cross section, which can be embedded in the trapezoidal groove reserved on the storage chamber 1 and the nozzle 2. The sealing between the storage chamber 1 and the nozzle 2 is achieved through the close contact between the arc surface and the side wall of the groove. The sealing method between the nozzle 2 and the storage chamber 1 can ensure reliable sealing under high pressure in the storage chamber 1.

[0036] In some embodiments of the present invention, the storage chamber 1 and the nozzle 2 are made of stainless steel, and the sealing gasket 3 is made of copper. As a preferred option, the sealing gasket 3 can be annealed. After annealing, the copper is more flexible and can achieve a better sealing effect.

[0037] Furthermore, the internal cavity profiles of the storage chamber 1 and the nozzle 2 must be consistent with the experimental model.

[0038] Furthermore, the pulsating pressure sensor includes a first pulsating pressure sensor 4 mounted on the side wall of the reservoir 1 and a second pulsating pressure sensor 5 mounted on the outlet side wall of the nozzle 2. The pulsating pressure sensors are installed in pre-drilled mounting holes on the side wall of the reservoir 1 and the outlet side wall of the nozzle 2. The axis of the pulsating pressure sensor is along the normal direction of the measuring point wall surface. The first pulsating pressure sensor 4 mounted on the side wall of the reservoir 1 can measure the pulsating pressure information of the airflow inside the reservoir 1, and the second pulsating pressure sensor 5 mounted on the outlet side wall of the nozzle 2 can measure the pulsating pressure information of the jet at the outlet of the nozzle 2.

[0039] In some embodiments of the present invention, the nozzle 2 and the reservoir 1 can be disassembled and combined. By replacing different nozzles 2 or different reservoirs 1, various measurement targets can be achieved. For example, in an experiment, the test model has multiple nozzles 2 with different internal cavity profiles, sharing a single reservoir 1. In this case, multiple nozzle 2 components and one reservoir 1 component can be fabricated. By combining the nozzles 2 and the reservoir 1, the pulsating pressure of the jets from multiple nozzles 2 can be measured.

[0040] In some embodiments of the present invention, pressure gauge 6 is connected to storage chamber 1 via pressure guiding pipeline, which can monitor the gas pressure in storage chamber 1 in real time.

[0041] In some embodiments of the present invention, the steps for measuring the self-pulsating pressure of a jet using the present invention are as follows:

[0042] (1) Determine the combination of the storage chamber 1 and the nozzle 2, as well as the total jet pressure, based on the model test conditions;

[0043] (2) Complete the connection and testing of each component and sensor of the device, and connect the jet gas supply system;

[0044] (3) Adjust the air source pressure until the reading of the pressure gauge 6 stabilizes at the required pressure to complete the adjustment of the total jet pressure;

[0045] (4) Start collecting pulsed pressure. After collecting the signal for a sufficient duration, turn off the gas source and the collection system.

[0046] (5) Process and analyze the pulsating pressure signal.

[0047] In summary, the device for measuring the pulsating pressure of a jet stream according to the present invention can solve the problem that the pulsating pressure of a jet stream is difficult to measure in the pulsating pressure measurement test, and the measurement results can reflect the pulsating pressure of the jet stream in the actual test.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for measuring self-pulsation pressure of a jet, characterized in that, This includes the reservoir, nozzle, pulsating pressure sensor, and pressure gauge; The left end of the storage chamber has a high-pressure gas source connection port, the upper end of the storage chamber is connected to the lower end of the nozzle, and the storage chamber and the nozzle are sealed together. A pulsating pressure sensor and a pressure gauge are installed on the side wall of the storage chamber, and a pulsating pressure sensor is installed on the side wall of the nozzle outlet. The lower end of the nozzle is connected to the upper end of the storage chamber. The nozzle is fastened to the storage chamber by bolts. A trapezoidal groove is provided around the nozzle inlet on the lower end surface of the nozzle. The internal cavity profiles of the storage chamber and the nozzle must be consistent with the test model; Includes multiple different nozzles and multiple different storage chambers; The different nozzles and the different reservoirs can be disassembled and assembled.

2. The device for measuring self-pulsation pressure of a jet stream according to claim 1, characterized in that, The storage chamber and the nozzle are sealed together by a sealing gasket.

3. The device for measuring self-pulsation pressure of a jet stream according to claim 2, characterized in that, The high-pressure gas source connection port left at the left end of the storage chamber is used to connect to the jet gas supply system; The upper end of the storage chamber is provided with an opening that communicates with the nozzle, and a trapezoidal groove is provided around the opening.

4. The device for measuring the pulsating pressure of a jet stream according to claim 3, characterized in that, The sealing gasket has a circular arc shape at both the top and bottom ends of its cross-section. The upper and lower ends of the sealing gasket are respectively embedded in the trapezoidal grooves reserved on the storage chamber and the nozzle.

5. The device for measuring the pulsating pressure of a jet stream according to claim 2, characterized in that, The storage chamber and the nozzle are made of stainless steel, and the sealing gasket is made of copper.

6. The apparatus for measuring the self-pulsating pressure of a jet stream according to any one of claims 1-5, characterized in that, The pulsating pressure sensor is installed in the pre-drilled mounting holes on the side wall of the storage chamber and the side wall of the nozzle outlet, with the axis of the pulsating pressure sensor along the normal direction of the measuring point wall.

7. The device for measuring the pulsating pressure of a jet stream according to claim 1, characterized in that, The pressure gauge is connected to the storage chamber via a pressure-conducting pipeline.

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