基于旋转阀的固体推进剂压强耦合响应测试方法

For the combustion instability of solid motors, an experimental method of pressure-coupled response of solid propellant based on rotary valve is proposed, and a rotary valve experimental system for cold gas and solid propellant ignition experiments is designed. In the cold gas experiments and theoretical calculations of 23 Hz, 46 Hz and 69 Hz oscillation frequencies, the maximum error of the two methods is 4.35%, which verifies the effectiveness of the circular grating positioning assembly to obtain the secondary exhaust passage area and pressure delay time of the rotary valve. Five ignition experiments of solid propellant at 23 Hz, 46 Hz, 69 Hz, 115 Hz and 138 Hz oscillation frequencies were carried out. The results show that the mean pressure of the combustion chamber is affected by the oscillation frequency, which is reduced from 2.88 MPa at 23 Hz to 2.523 MPa at 138 Hz. The pressure-coupled response function of the measured solid propellant is less affected by the oscillation frequency, which is maintained at 0.80±0.13. The rotary valve scheme is feasible and reliable.