Tests for sound energy resonance law of solid rocket engins

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (13) : 82-87.

ZHAO Tianquan, ZHANG Xiangyu, GAN Xiaosong

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Abstract

Based on acoustic characteristics of acoustic unstable combustion of solid rocket engine, acoustic excitation was taken as the disturbance to provide energy, the test method to explore the acoustic energy resonance law of solid rocket engine was established and the test system was built. Tests were conducted for different engine structures. The results showed that the test system can characterize acoustic characteristics of acoustic unstable combustion; oscillation frequencies of different front heads’ acoustic cavities are basically the same,
for the first-order pressure oscillation, the ellipsoidal front head acoustic cavity with a cavity has the lowest stability, for the second and third order pressure oscillations, the ellipsoidal front head has the highest acoustic cavity stability; the larger the volume of submerged cavity, the lower the each order pressure oscillation frequency and the worse the acoustic vibration stability. The analysis results of sound transmission characteristics showed that increase in submerged cavity length causes decrease in transmission coefficient of outlet sound power and stability.

Key words

solid rocket engine / acoustic unstable combustion / acoustic characteristics / front head structure / submerged cavity

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ZHAO Tianquan, ZHANG Xiangyu, GAN Xiaosong. Tests for sound energy resonance law of solid rocket engins[J]. Journal of Vibration and Shock, 2021, 40(13): 82-87

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