论文部分内容阅读
为了提高流线追踪喷管设计方法的灵活性,从推力和力矩两方面考虑,引入特殊中心体,探索了壁面膨胀规律可控的轴对称基准流场设计方法.设计过程中利用特征线理论(MOC)实现了由膨胀规律求解气动壁面的反设计.针对基准流场的主要设计参数,包括膨胀规律、中心体及斜倾角等进行了参数化研究,得到了设计参数对基准流场结构及性能的影响规律.利用该基准流场,设计了矩形截面的流线追踪喷管(导出喷管),并进行了分析.结果表明:利用特征线理论可以实现膨胀规律到壁面的反设计;在进口参数和落压比一定的条件下,存在一定的膨胀规律使得基准流场的内推力最大;流场的中心体尺度和长度比对推力影响很小,可作为调整导出喷管力矩的设计参数;出口斜倾角增大会导致基准流场的长度减小,同时推力下降明显,设计时应综合考虑.
In order to improve the flexibility of the design method of streamline tracking nozzle, a special center body is introduced from the aspects of thrust force and torque, and the axial symmetry reference flow field control method with wall expansion law is explored. MOC) to realize the inverse design of the aerodynamic wall by the expansion law.According to the main design parameters of the reference flow field, including the expansion law, the center body and the inclined angle, the parameters of the design and the reference flow field structure and performance The flow field of the rectangular cross-section tracking nozzle (outlet nozzle) is designed and analyzed.The results show that the inverse design of the expansion law to the wall can be realized by using the characteristic line theory, Under the condition of certain parameter and pressure ratio, there is a certain expansion law that maximizes the internal thrust of the reference flow field. The central body scale and length of the flow field have little effect on the thrust force and can be used as the design parameter for adjusting and deriving the nozzle torque. Increasing the slope of the exit will result in a decrease in the length of the reference flow field and a significant reduction in thrust, which should be taken into account when designing.