Influence Analysis on Inner Flow Field of Nozzle for Different Radius and Shapes of Pintle

The pintle controlled thrust regulating mechanism is an effective means to realize thrust real-time regulation of solid-rocket engine. Factors of thrust regulating range and speed, thrust loss, reacting force on pintle section should be considered in pintle design. Numerical simulation on inner flow field of nozzle for different radius pintle, different head coning of pointed cone pintle and different head ellipticity of ellipsoidal pintle had been carried, and the flow field changing was analyzed. The changing rule of thrust regulating under different conditions was gotten. These results provide theoretical guidance for pintle design.