复合结构喷管烧蚀形貌的测定及其对流场的影响

doi:10.7527/S1000-6893.2014.0326

Abstract

Abstract:

In order to study the influence of errosion morphology on the solid rocket motor nozzle, laser scan technique is used to measure the erosion morphology of a composite structure nozzle (made of silica-phenolic and graphite). The measured results show that erosion steps form on the interfaces of two materials. The erosion step presents on the interface in the convergent section, while the step in the divergent section is located at a certain distance downstream of the interface. The nozzle shapes at three different time instants are calculated based on the measured average erosion rates. Then numerical simulations are carried out based on the three nozzle geometries to investigate the influence of the nozzle shape-change caused by erosion on the fluid structure, the heat transfer on the wall and the thrust performance. The results show that a recirculation zone forms around the erosion step in the divergent section, resulting in an enhancement of local heat transfer; expansion waves and oblique shock form around the step and influence the structure of main stream dramatically. While the erosion step in convergent section exerts little influence on the flow field and the heat transfer is decreased in the upstream region of the erosion step. The presence of erosion steps changes the pressure distribution on the nozzle wall, causing a drop in the rocket thrust.

Key words: erosion, laser scan, composite structure nozzle, erosion step, shock wave

CLC Number:

V211
TJ714

LIU Rui, CHEN Xiong, ZHOU Changsheng, LI Yingkun. Measurement of erosion morphology in a composite structure nozzle and its influence on flow field[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(9): 2958-2967.

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Measurement of erosion morphology in a composite structure nozzle and its influence on flow field

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