【摘要】 研究了当气流偏离抛物型喷管超音速段对称轴时所引起的喷管推力偏心．用三维特征线方法数值模拟了喷管内的非对称流场，得到了在不同入口扩张半角时，喷管侧向推力分量沿轴向的变化及其零点位置在轴线上的分布．结果表明，侧向力第一零点和第二零点的位置随入口扩张半角的变化都是非线性的更多还原

【Abstract】 Thrust misalignment in parabolic nozzle is investigated for the situation where the gas flow is misaligned with respect to the axis of the supersonic region of the nozzle. The isentropic, non symmetrical flow fields in nozzles are numerically simulated by the three dimensional method of characteristics. Distributions of side force and zero points along the axis of nozzle are presented for different entrance half angles. The results show that the first zero point and second zero point of the side force vary nonlinearly with respect to the entrance half angles.更多还原