中文摘要：

主流附体问题是逆流推力矢量喷管实际应用中可能遇到的最严重问题之一。当主流附体出现时，会造成推力矢量的失控，因此，在深人研究逆流推力矢量喷管主要气动、几何参数影响规律的同时，有必要关注逆流推力矢量喷管的主流附体问题。基于此，采用CFD数值模拟技术，分析了主流附体形成的机理、特点和主流附体发生过程，提出了采用提高抽吸压力和增加喷管主流压比两种实现附体主流脱体的控制方法。研究表明，尽管存在明显的滞后效应，但控制抽吸压力、主流压比是实现附体主流脱体的有效方法。

英文摘要：

Jet attachment is a critical restriction for the usage of counter-flow thrust vectoring nozzle, which will lead to the control invalidation of vector thrust. Therefore more attention should be paid to jet attachment phenomenon and detachment control. Based on CFD technology, the jet attachment mechanism, characteristic and forming course were investigated, and two methods for jet detachment were proposed. One is to increase suction pressure, and the other is to enhance nozzle pressure ratio（NPR）. The results show that jet detachment would be successfully achieved by implement of suction pressure and NPR control. However, hysteresis phenomenon existed in the suction pressure control course. The jet attachment suction pressure was 60.68kPa, while detachment pressure 65.86kPa.