固体推进剂速度耦合响应函数测量实验方法研究

In order to obtain the characteristic of the velocity coupled response function, a new method of measuring the velocity-coupling response of aluminum solid propellants by using T burner is proposed, and through which the velocity-coupling response characteristics are examined when oscillation frequency is set about 175Hz and pressure is set about 6.5MPa. The results show that, firstly, the characteristic of the velocity-coupling response is obviously different from the pressure-coupling response, and the value of the pressure-coupling is positive in the whole acoustic field in the chamber, but the value of the velocity-coupling could be either positive or negative in the acoustic field. Secondly, under the test conditions, the velocity-coupling response value is much larger than the pressure-coupling response value. Thus, for the nonlinear combustion instability in the solid rocket motor, the velocity-coupling response plays an important role that cannot be neglected. Finally, this method can be used to measure the coupling response function of both velocity and pressure at same time, which can be better used to analyze the combustion response characteristics of the aluminum solid propellant. Thus, this method can provide an important experimental technique for the analysis of the nonlinear combustion instability problem of solid rocket motor.