关键词: 逆流;矢量喷管;抽吸角;横向高度;垂直段高度 

Abstract: To provide a theoretical basis for the selection of counter-flow thrust vectoring nozzle geometry,numerical simulation method was applied to study the internal flow structure and performance of the counter-flow thrust vectoring nozzle with suction angle, suction collar horizontal height and vertical height in zero attack angle and subsonic conditions. The changes of thrust vector angle, resultant thrust ratio, and secondary mass flow ratio were obtained. Research results indicate that both suction angle and collar vertical height have less effects on the change of the counter-flow vectored nozzle thrust vector angle. And when suction angle and collar vertical height changes respectively, the angular deviation between their maximum and minimum vector angle is not more than 0.35°. Resultant thrust ratio decreases with the increasing of suction angle and collar vertical height. When suction angle changes, resultant thrust ratio is about 0.778and the change value is not more than 0.001. Resultant thrust ratio is in the range from 0.77to 0.84as vertical height changes. Mass flow ratio is less affected by suction angle and collar vertical height. Jet attachment easily occurs when horizontal height is too small. With increasing of horizontal height, thrust vector angle increases, and it can achieve the maximum value 7°. On the contrary, resultant thrust ratio decreases and it is in the range of 0.75~0.87. During the procedure of increasing horizontal height, suction flow shifts up to 2% from co-flow to counter-flow and mass flow ratio increases. The overall performance of thrust vectoring nozzle significantly decreases compared with no outflow.

Key words: Counter-flow; Vectoring nozzle; Suction angle; Horizontal height; Vertical height