Test method for nonlinear unstable combustion of solid rocket motors under overload conditions

Abstract

The invention discloses a method for testing nonlinear unstable combustion of solid rocket engines under overload conditions, and belongs to the field of unstable combustion of solid rocket engines. The overload conditions are added on the basis of ground static unstable combustion tests on the solid rocket engines. The method includes mounting the solid rocket engines on ground high-overload testdevices, adjusting overload angles theta and rotation speeds omega of the high-overload test devices, and allowing the solid rocket engines to have acceleration in different directions with differentmagnitudes so as to allow the solid rocket engines to work under the different overload conditions; generating pulses by pulse triggers mounted at seal heads after ignition work is carried out, triggering combustion instability phenomena of the solid rocket engines, and simultaneously observing and recording combustion states of the solid rocket engines by standard internal trajectory pressure sensors and high-frequency response pressure sensors. The method has the advantages that test variables can be changed, coupling effects of overload and other test variables can be analyzed, and accordingly nonlinear unstable combustion of the solid rocket engines can be tested under the overload conditions.

Description

technical field [0001] The invention relates to a test method for nonlinear and unstable combustion of solid rocket motors under overload conditions, and belongs to the field of unstable combustion of solid rocket motors. Background technique [0002] With the continuous development of missile weapons and aerospace propellant technology, the demand for high thrust and long range has been continuously raised, and more and more high-energy propellants are used in solid rocket motors (SRM). Since high-energy composite propellants can easily cause combustion instability, ranging from abnormal internal ballistic curves to explosions of solid rocket motors, the theory of unstable combustion of composite propellants has always been a research hotspot. Among them, the specific mechanism of nonlinear unstable combustion still lacks an authoritative model, and its theoretical research is still in its infancy. There is an extremely urgent demand in engineering to solve nonlinear unstab...

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Problems solved by technology

[0005] In order to solve the incomplete nonlinear and unstable combustion theory of solid rocket motors, the experimental conditions did not take into account the influence of overload conditions under actual working conditions, resulting in a large gap between the obtained laws and real working conditions, and the overload conditions and unstable combustion The problem of coupling effect is not yet clear, the purpose of this invention is to provide a test method for nonlinear unstable combustion of solid rocket motor under the condition of high overload on the ground

Through the test of the above working conditions, the complex overload state of the solid rocket motor in the actual high-altitude operation and turning is simulated, and the influence of the complex overload state on the nonlinear unstable combustion and the relationship between the overload and the nonlinear unstable combustion influencing factors are analyzed. Coupling effect, and then solve related engineering problems

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