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为了了解外流对塞式喷管性能的影响 ,本文从N S方程出发 ,采用NND格式对塞式喷管有外流的流场进行了数值模拟 ,重点研究了外流马赫数和外流迎角对塞式喷管的影响。研究表明 ,在一定飞行高度下 ,外流会使塞式喷管的性能降低 ,并且外流为亚声速时对塞式喷管的影响较小 ,在跨声速和超声速时影响较大 ;当外流有迎角时 ,会改变塞式喷管推力矢量 ,正迎角会使塞式喷管性能得到补偿 ,负迎角则会降低塞式喷管的性能。随着背压减小 ,外流对塞式喷管的影响也会减小
In order to know the influence of outflow on the performance of the plug nozzle, this paper numerically simulates the flow field of the plug nozzle using the NND format from the NS equation. Focusing on the Mach number of the outflow and the outward angle of attack, Effect of tube. The results show that, at a certain flight altitude, the outflow can reduce the performance of the plug nozzle, and the outflow to the sub-sonic nozzle plug less impact on transonic and supersonic impact; when the outflow of Ying Angle, it will change the plug nozzle thrust vector, is the angle of attack nozzle performance will be compensated nozzle, negative angle of attack will reduce the nozzle nozzle performance. As the backpressure decreases, the effect of outflows on the plug nozzle will also be reduced