Study on pulse triggering combustion instability in a combustion chamber

Based on a T-burner, pulse triggering, and 'burning surface doubled and secondary attenuation' algorithm, different kinds of solid propellants' oscillation combustion features in the acoustic field were studied experimentally and numerically. In the experimental part, the effectiveness of the pulse excitation modes was explored, and the combustion instability characteristic of different solid propellants was researched. In the numerical part, the difference of pressure pulse and mass release rate pulse was studied, and performance parameters of propellant, such as burning rate and flame temperature, how to effect on the pressure coupled response function was discussed. The results shown that pulse drag burning rate must be intense enough to excite pressure oscillation. The thermo-acoustic oscillation combustion mechanism in T-burner is analyzed. The uneven oxidant particle and flue mixing of composite propellant caused the mass release rate periodic variation, that respond the pressure are the main reasons of thermoacoustic coupling effect.