A liquid rocket engine combustion stability appraisal test device

Abstract

A liquid rocket engine combustion stability appraisal test device, comprising a combustion chamber head, a combustion chamber body, a transition ring, an upper connecting ring, and a lower connecting ring; the combustion chamber head is provided with an oxidant inlet; the transition ring is placed in the combustion chamber head Between the combustion chamber body and the combustion chamber body, the transition ring connects the combustion chamber head and one end of the combustion chamber body respectively through the upper connecting ring and the lower connecting ring; the other end of the combustion chamber body is provided with a fuel-coolant inlet liquid collecting cavity, and fuel-cooling A fuel-coolant inlet is set on the liquid collecting cavity of the coolant inlet, a fuel-coolant cooling channel is set in the side wall of the combustion chamber body, and the fuel-coolant cooling channel is communicated with the inner cavity of the lower connecting ring; the transition ring passes through the fuel-coolant guide. The flow holes are respectively communicated with the inner cavity of the upper connecting ring and the lower connecting ring. The invention truly reflects the influence of the regenerative cooling result on the combustion stability, and can meet the requirements of reliable excitation in different stages of starting, transition and shutdown.

Description

technical field [0001] The invention relates to a test device for evaluating the combustion stability of a liquid rocket engine. Background technique [0002] The occurrence of unstable combustion of liquid rocket engines is very random. In general engine test runs, even if combustion instability does not occur many times, it cannot be determined that its dynamic stability meets the requirements. For example, a nitrous oxide / hydrazine mixed-50 engine has 9 high-frequency unstable combustion in 1800 test runs, and the probability of instability is 0.5%. The stability level of this engine cannot meet the requirements for use. The dynamic combustion stability qualification test is an effective method to determine the engine combustion stability margins and boundaries with as few tests as possible. One of the key technologies is the design and realization of the qualification test device. [0003] At present, the commonly used test device design structure methods for dynamic c...

AI Technical Summary

Problems solved by technology

[0004] (1) Head-mounted type, only applicable to the bomb disturbance method, the orientation of the bomb may affect the combustion sensitivity, and the non-uniform heating or ablation of the shell may introduce directional effects

Most conventional structural designs are prone to thermal explosions and fragments that can cause damage to the engine

[0005] (2) Body-mounted type, limited by the wall structure of the body chamber, it is difficult to apply to the regenerative cooling engine

Images