关键词: 单脉冲；固体姿态控制发动机；燃面退移；面偏移法；耦合数值模拟

Abstract: To deal with the problem of propellant burning surface regression coupled with flow field in a sin.gle-pulse solid attitude control motor，a theoretical basis of the coupling method was given to establish a bidirec.tional coupled simulation model based on dynamic mesh. Face-offsetting method was utilized for modeling thepropellant burning surface regression. The mesh was optimized by mesh smoothing and rebuilding techniques forsolving the deformation of fluid meshes. The coupling process was calculated by using loosely coupled method. Anumerical coupled simulation between internal flow field and burning surface regression for the single-pulse solidattitude control motor used in the PAC-3 extended range interceptor missile was carried out by the coupling meth.od. The internal trajectory and other various parameters were obtained. The results are consistent with related ex.perimental results. The maximum relative error of chamber pressure is 3.96%. Face-offsetting method can effec.tively track the regression of the propellant burning surface. The coupled method can accurately and stably simu.late the coupling process between the internal flow field and the propellant surface regression，which can be used for providing an effective solution to the multi-physics coupling of single-pulse solid attitude control motor.

Key words: Single-pulse； Solid attitude control motor； Burning surface regression； Face-offsetting method；Coupled simulation