Fixing device for explosive columns of solid rocket engine

Abstract

The invention discloses a solid rocket motor powder column fixing device, which is used for fixing the radial stability of the combustion powder column on the entire surface of the engine. The engine grain fixing device includes a positioning sleeve, an elastic retaining ring and a gasket. The positioning sleeve has a thin circular structure and is designed with replaceable parts. The positioning sleeves of different sizes are matched according to the diameter of the rocket engine charge. A plurality of elastic retaining rings are evenly distributed along the circumferential direction of the positioning sleeve to ensure the stability of the charging axis. Arc-shaped gaskets are installed at the end of the circlip inside the positioning sleeve, and multiple groups of circlip gaskets have equal radial distances according to the center of the positioning sleeve, which can reduce the destructiveness of the charge due to stress concentration. The positioning sleeve, the retaining ring and the gasket are all processed by the same type of high-temperature-resistant metal material; during the combustion process, the parallel state of the axis of the free-filling full-surface combustion charge is guaranteed, and the pressure and thrust of the small engine on the ground are tested more accurately test.

Description

technical field [0001] The invention belongs to the technical field of solid rocket motor static tests, and in particular relates to a solid rocket motor grain fixing device. Background technique [0002] Engine ground pressure and thrust test plays an important role in the development of solid rocket motor. At present, in the pressure and thrust tests of small engines, free-packed full-surface combustion charges are basically used. A large number of test data show that during the working hours of the engine, the central axis of the full-surface combustion grain cannot be stably parallel to the central axis of the combustion chamber shell, which makes the pressure and thrust curve of the engine deviate. Therefore, this must be eliminated. A test error caused by non-parallel axes of the grain. At present, in small solid rocket motors, there is a lack of a simple and effective support measure for the radial stability of free-filling full-surface combustion grains. Invention ...

AI Technical Summary

Problems solved by technology

A large number of test data show that during the working hours of the engine, the central axis of the full-surface combustion grain cannot be stably parallel to the central axis of the combustion chamber shell, which makes the pressure and thrust curve of the engine deviate. Therefore, this must be eliminated. A test error caused by non-parallel axes of grain columns

At present, in small solid rocket motors, there is a lack of a simple and effective support measure for the radial stability of free-filling full-surface combustion grains. Invention patent 201210440049. " and invention patent 201110321594.2 disclose " a kind of sliding barrel type center frame for static test of solid rocket motor ", there is a problem in fixing the motor: only for the casing part of the solid rocket motor in the static test run test on the ground, the fixing device is proposed and connection method, there is no research on the charge part in the shell

In the patent 201320430843.6, "a rocket propellant grain fixing device" is proposed. The disadvantage of the research on the grain fixing device is that a fixing measure is proposed for the axial direction of the grain, but it is not suitable for all small solid rocket motors. Radial fixation of surface-burning charges is yet to be studied

In terms of charge production, the published literature "Small Opening Shell Free Charge Column Fixation" ("Journal of Ammunition and Guidance", 2009, 01:157-158.) proposed several items for fixing during the production process. The improvement measures of the effect, but did not discuss the stability of the grain in the shell

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