A test nozzle for pressure measurement of a end-burning motor

Abstract

The utility model discloses a test nozzle for end -burning engine pressure measurement, including through the convergent section and the expansion section of head -tail through thread connection, the throat lining is glued in the front end inner wall grooving of expansion section, the side wall upper end of convergent section is opened and has the pressure measurement hole, and the convergent section outer wall pressure measurement hole place welds and fixes the pressure measurement nozzle, the sensor mounting screw hole is opened in the pressure measurement nozzle, and the sensor mounting screw hole of pressure measurement nozzle is communicated with pressure measurement hole, and the convergent section's outer wall lower end welds and fixes the boost button for fixed collision, the front end of test nozzle convergent section is with the rear end of charge combustion chamber thread fixed, the rear end of test nozzle expansion section thread fixed sealing cover, the inner chamber of test nozzle convergent section is glued and has the ignition powder box, the sensor mounting screw hole of pressure measurement nozzle is fixed pressure sensor. The utility model discloses a test nozzle, can realize the working pressure and ignition pressure test of end -burning solid engine.

Description

Technical Field

[0001] This utility model relates to a test nozzle for pressure measurement of end-burning engines, belonging to the field of solid rocket engine pressure testing technology. Background Technology

[0002] Solid rocket motors with end-burning propellant charges are characterized by low thrust, long burn time, and high loading coefficient. This type of propellant is suitable for anti-tank, shore-to-ship, and surface-to-air endurance engines, as well as engines (or gas generators) used for aircraft attitude control. The propellant loading process can be either free-filling or wall-mounted casting.

[0003] When testing the pressure of an internal combustion solid rocket motor, a gas passage is typically designed at the front end cap. Gas enters the pressure sensor through the propellant's inner bore, thus enabling the testing of the rocket motor's operating pressure. However, the axial center of an end-burning engine is occupied by the propellant, making it impossible to obtain a gas passage from the front of the combustion chamber for pressure testing. Therefore, pressure testing of end-burning engines must be considered within the space between the nozzle convergence section and the propellant. The pressure testing device should be reusable, high-temperature resistant, erosion-resistant, and structurally simple. A test nozzle made of refractory metal with a gas passage designed into the sidewall is suitable, allowing for both normal engine function and pressure testing. Utility Model Content

[0004] The purpose of this invention is to solve the pressure testing problem of end-burning solid rocket engines without adding extra parts or devices, and to design a test nozzle that can complete pressure data acquisition without affecting engine operation.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] This utility model discloses a test nozzle for pressure measurement of an end-burning engine, comprising a convergent section and an expander section connected end to end by threads. The inner wall of the front end of the expander section is grooved and has a throat liner bonded to it, so that the inner wall of the convergent section, the inner wall of the throat liner and the inner wall of the expander section form a Laval inner shape.

[0007] A pressure measuring hole is opened at the upper end of the side wall of the convergence section, and a pressure measuring nozzle is welded and fixed at the pressure measuring hole on the outer wall of the convergence section. A sensor mounting screw hole is opened in the pressure measuring nozzle, and the sensor mounting screw hole of the pressure measuring nozzle is connected to the pressure measuring hole. An auxiliary button for fixing the bump is welded and fixed at the lower end of the outer wall of the convergence section.

[0008] The front end of the converging section of the test nozzle is threadedly fixed to the rear end of the combustion chamber, the rear end of the expanding section of the test nozzle is threadedly fixed with a sealing cap, and an ignition cartridge is adhered to the inner cavity of the converging section of the test nozzle; a pressure sensor is fixed inside the mounting screw hole of the pressure measuring nozzle.

[0009] A sealing gasket is installed at the mating end face of the converging section and the expanding section.

[0010] When the engine is working normally, a small portion of the high-temperature, high-pressure gas flowing through the converging section of the test nozzle enters the pressure sensor, which can collect the engine's operating pressure through the pressure sensor.

[0011] Beneficial effects:

[0012] The test nozzle of this invention has a simple structure, comes with a built-in assist button, is quick to replace, and is easy to install. It can realize the working pressure and ignition pressure testing of end-burning solid rocket motors, can be reused, and has important value for promotion and application. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the test nozzle of this utility model;

[0014] Figure 2 This is a schematic diagram of the experimental nozzle of this utility model in use;

[0015] In the diagram, 1-converging section, 2-pressure measuring nozzle, 3-sealing gasket, 4-throat liner, 5-expansion section, 6-assist button, 7-combustion chamber, 8-ignition cartridge, 9-sealing cap. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] Example

[0018] like Figure 1 As shown, a test nozzle for pressure measurement of an end-burning engine according to the present invention includes a converging section 1 and an expanding section 5 connected end to end by threads. The inner wall of the front end of the expanding section 5 is grooved and has a throat liner 4 bonded to it, so that the inner wall of the converging section 1, the inner wall of the throat liner 4 and the inner wall of the expanding section 5 form a Laval inner shape.

[0019] A pressure measuring hole is opened at the upper end of the side wall of the convergence section 1. A pressure measuring nozzle 2 is welded and fixed at the pressure measuring hole on the outer wall of the convergence section 1. A sensor mounting screw hole is opened in the pressure measuring nozzle 2, and the sensor mounting screw hole of the pressure measuring nozzle 2 is connected to the pressure measuring hole. An auxiliary button 6 for fixing the collision is welded and fixed at the lower end of the outer wall of the convergence section 1.

[0020] Figure 2 This is a schematic diagram of the experimental nozzle of this utility model in use;

[0021] The front end of the test nozzle converging section 1 is threadedly fixed to the rear end of the propellant combustion chamber 7, the rear end of the test nozzle expanding section 5 is threadedly fixed to the sealing cap 9, and the inner cavity of the test nozzle converging section 1 is glued to the ignition box 8; the pressure sensor of the pressure measuring nozzle 2 is fixed in the sensor mounting screw hole.

[0022] A sealing gasket 3 is installed at the mating end face of the converging section 1 and the expanding section 5.

[0023] When the engine is working normally, a small portion of the high-temperature, high-pressure gas flowing through the converging section of the test nozzle enters the pressure sensor, which can collect the engine's operating pressure through the pressure sensor.

Claims

1. A test nozzle for pressure measurement of an end-burning engine, comprising a convergent section and an expander section connected end-to-end by threads, wherein the inner wall of the front end of the expander section is grooved and has a throat liner bonded thereto, such that the inner wall of the convergent section, the inner wall of the throat liner, and the inner wall of the expander section form a Laval inner shape; Its features are, A pressure measuring hole is opened at the upper end of the side wall of the convergence section, and a pressure measuring nozzle is welded and fixed at the pressure measuring hole on the outer wall of the convergence section. A sensor mounting screw hole is opened in the pressure measuring nozzle, and the sensor mounting screw hole of the pressure measuring nozzle is connected to the pressure measuring hole. An auxiliary button for fixing the bump is welded and fixed at the lower end of the outer wall of the convergence section. The front end of the converging section of the test nozzle is threadedly fixed to the rear end of the combustion chamber, the rear end of the expanding section of the test nozzle is threadedly fixed with a sealing cap, and an ignition cartridge is adhered to the inner cavity of the converging section of the test nozzle; a pressure sensor is fixed inside the mounting screw hole of the pressure measuring nozzle.

2. The test nozzle for pressure measurement of an end-burning engine as described in claim 1, characterized in that, A sealing gasket is installed at the mating end face of the converging section and the expanding section.

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