Device for measuring pulsating pressure of jet flow

Abstract

The invention relates to the technical field of jet flow pulsating pressure measurement tests, in particular to a device for measuring pulsating pressure of jet flow. A high-pressure air source connector is reserved at the left end of a storage chamber of the device for measuring the pulsating pressure of the jet flow, the upper end of the storage chamber is connected with the lower end of a spray pipe, and the storage chamber is hermetically connected with the spray pipe; 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 outlet side wall of the spray pipe. The storage chamber and the spray pipe can be disassembled and assembled, and various measurement targets can be achieved by replacing different spray pipes or different storage chambers. The invention provides a set of device independent of a test model, the device adopts the storage chamber and the spray pipe of which the inner cavity molded surfaces are consistent with the test model, the structures and the connection modes of the storage chamber and the spray pipe are elaborately designed, and pulsating pressure sensors are mounted on the side wall of the storage chamber and the side wall of an outlet of the spray pipe; the problem that it is difficult to arrange a sensor on a model to independently measure the pulsating pressure of the jet flow in a pulsating pressure measurement test with the jet flow is solved.

Description

Technical Field

[0001] The invention relates to the technical field of jet flow pulsation pressure measurement test, in particular to a device for measuring the pulsation pressure of a jet flow itself. Background Art

[0002] In order to quickly transfer the spacecraft cabin carrying astronauts to a safe area in an emergency, the manned spacecraft escape tower is generally equipped with a high-thrust engine. The jet and incoming flow of the high-thrust engine will produce a strong interference effect, which will affect the spacecraft cabin at the rear end of the escape engine, inducing a series of problems such as cabin structure vibration and internal cabin noise, which is related to the astronauts' riding comfort and safety. Therefore, during the entire escape system design and development process, special attention should be paid to the aerodynamic noise of the escape system.

[0003] Wind tunnel test is an effective means to study aerodynamic problems. In wind tunnel test, pulsating pressure sensors are usually arranged on the surface of the model to measure aerodynamic noise. For test models with jets such as the manned spacecraft escape tower, no matter whether cold jets or hot jets are used to simulate the actual engine jets, the model chamber pressure and nozzle outlet pressure are not absolutely stable when the jet system is working in the test. This makes the measured pulsating pressure signal already contain the pulsating pressure component of the jet itself. However, it is difficult to arrange sensors on the model to measure the pulsating pressure of the jet itself separately in the test.

[0004] In view of this, in order to understand the pulsating pressure of the jet itself and eliminate its influence on the test results, it is necessary to design a jet pulsating pressure measurement device independent of the test model, which can measure the pulsating pressure of the jet itself separately. This device can be widely used in pulsating pressure measurement tests with jets. Summary of the invention

[0005] The object of the present invention is to provide a device for measuring the pulsating pressure of the jet itself, which can obtain the pulsating pressure conditions of the jet inside the storage chamber and at the nozzle outlet, and provide relevant pulsating pressure information of the jet itself for the pulsating pressure measurement test with the jet.

[0006] The present invention provides a device for measuring the pulsating pressure of a jet flow, which comprises a storage chamber, a nozzle, a pulsating pressure sensor and a pressure gauge;

[0007] A high-pressure gas source connection port is reserved at the left end of the storage chamber, 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;

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

[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] An opening which is communicated with the nozzle is arranged at the upper end of the storage chamber, and a circle of trapezoidal grooves is arranged 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 circle of trapezoidal grooves is provided on the lower end surface of the nozzle around the nozzle inlet.

[0013] Preferably, the upper and lower ends of the cross section of the sealing gasket are both arc-shaped;

[0014] The upper end and the lower end 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 inner cavity profiles of the storage chamber and the nozzle should be consistent with the test model.

[0017] Preferably, the pulsating pressure sensor is installed in the mounting holes reserved on the side wall of the storage chamber and the side wall of the nozzle outlet, and the axis of the pulsating pressure sensor is along the normal direction of the wall surface of the measuring point.

[0018] Preferably, it comprises a plurality of different nozzles and a plurality of different storage chambers;

[0019] Different nozzles and different storage chambers 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] The present invention provides a set of devices independent of the test model. The device adopts a storage chamber and a nozzle whose inner cavity surface is consistent with the test model, and the structure and connection method of the two are carefully designed. Pulsating pressure sensors are installed on the side walls of the storage chamber and the side walls of the nozzle outlet, which solves the problem that it is difficult to arrange sensors on the model to separately measure the pulsating pressure of the jet itself in the pulsating pressure measurement test with the jet. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0025] Description of reference numerals:

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

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0031] Among them, a high-pressure gas source connection port is reserved at the left end of the storage chamber 1, 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, and pulsating pressure sensors are installed on the side wall of the storage chamber 1 and the side wall of the nozzle 2 outlet.

[0032] Furthermore, a high-pressure gas source connection port is reserved at the left end of the storage chamber 1 for connecting to the jet gas supply system. An opening communicating with the nozzle 2 is provided at the upper end of the storage chamber 1, and a circle of trapezoidal grooves is provided around the opening.

[0033] In some embodiments of the present invention, the jet air supply system connected to the 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 circle of trapezoidal grooves is provided on the lower end surface of the nozzle 2 around the inlet of the nozzle 2 .

[0035] In some embodiments of the present invention, the cross-section of the sealing gasket 3 is arc-shaped from top to bottom, and can be embedded in the trapezoidal grooves reserved on the storage chamber 1 and the nozzle 2. The sealing between the storage chamber 1 and the nozzle 2 is achieved by 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 storage chamber 1 pressure.

[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 embodiment, the sealing gasket 3 can be annealed. The annealed copper is softer and can provide a better sealing effect.

[0037] Furthermore, the inner cavity surfaces of the storage chamber 1 and the nozzle 2 must be consistent with the test model.

[0038] Further, the pulsating pressure sensor includes a first pulsating pressure sensor 4 on the side wall of the storage chamber 1, and a second pulsating pressure sensor 5 installed on the side wall of the nozzle 2 outlet. The pulsating pressure sensor is installed in the installation holes reserved on the side wall of the storage chamber 1 and the side wall of the nozzle 2 outlet, and the axis of the pulsating pressure sensor is along the normal direction of the measuring point wall surface. The first pulsating pressure sensor 4 installed on the side wall of the storage chamber 1 can measure the pulsating pressure information of the airflow inside the storage chamber 1, and the second pulsating pressure sensor 5 installed on the side wall of the nozzle 2 outlet can measure the pulsating pressure information of the jet at the nozzle 2 outlet.

[0039] In some embodiments of the present invention, the nozzle 2 and the storage chamber 1 can be assembled and disassembled, and various measurement targets can be achieved by replacing different nozzles 2 or different storage chambers 1. For example, in the test, the test model has multiple nozzles 2 with different inner cavity profiles, sharing a storage chamber 1. In this case, multiple nozzle 2 parts and one storage chamber 1 part can be processed. Through the combination of the nozzle 2 and the storage chamber 1, the pulsating pressure of the jets of multiple nozzles 2 can be measured.

[0040] In some embodiments of the present invention, the pressure gauge 6 is connected to the storage chamber 1 through a pressure-conducting pipeline, and can monitor the air pressure in the storage chamber 1 in real time.

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

[0042] (1) Determine the combination of the storage chamber 1 and the nozzle 2, and the total pressure of the jet according to the model test conditions;

[0043] (2) Complete the connection and detection of all components and sensors of the device, and connect the jet air supply system;

[0044] (3) adjusting the air source pressure until the pressure gauge 6 indicates a stable pressure, thereby completing the adjustment of the total pressure of the jet;

[0045] (4) Start collecting pulsating pressure. After collecting signals for a sufficient period of time, turn off the gas source and the collection system;

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

[0047] In summary, a device for measuring the pulsating pressure of a jet itself according to an embodiment of the present invention can solve the problem that the pulsating pressure of a jet itself is difficult to measure in a pulsating pressure measurement test with a jet, and the measurement result can reflect the pulsating pressure of the jet itself 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, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 the pulsating pressure of a jet, characterized in that: It includes a storage chamber, a nozzle, a pulsation pressure sensor and a pressure gauge; A high-pressure gas source connection port is reserved at the left end of the storage chamber, 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; The side wall of the storage chamber is installed with a pulsating pressure sensor and a pressure gauge, and the side wall of the nozzle outlet is installed with a pulsating pressure sensor.

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

3. The device for measuring the pulsating pressure of a jet 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; An opening which is communicated with the nozzle is arranged at the upper end of the storage chamber, and a circle of trapezoidal grooves is arranged around the opening.

4. The device for measuring the pulsating pressure of a jet according to claim 3, characterized in that: 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 circle of trapezoidal grooves is arranged on the surface of the lower end of the nozzle around the nozzle inlet.

5. The device for measuring the pulsating pressure of a jet according to claim 4, characterized in that: The upper and lower ends of the cross section of the sealing gasket are both arc-shaped; The upper end and the lower end of the sealing gasket are respectively embedded in the trapezoidal grooves reserved on the storage chamber and the nozzle.

6. The device for measuring the pulsating pressure of a jet 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.

7. The device for measuring the pulsating pressure of a jet according to claim 1, characterized in that: The inner cavity surfaces of the storage chamber and the nozzle must be consistent with the test model.

8. The device for measuring the pulsating pressure of a jet flow according to any one of claims 1 to 7, characterized in that: The pulsating pressure sensor is installed in the mounting holes reserved on the side wall of the storage chamber and the side wall of the nozzle outlet, and the axis of the pulsating pressure sensor is along the normal direction of the measuring point wall.

9. The device for measuring the pulsating pressure of a jet according to any one of claims 1 to 7, characterized in that: including a plurality of different nozzles and a plurality of different storage chambers; Different nozzles and different storage chambers can be disassembled and assembled.

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

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