射流角度对平板横向射流的影响

采用数值和试验方法研究了射流角度对平板横向射流流动结构和工作特性的影响,将得出的规律应用于射流控制矢量喷管上.在小型风洞试验台上进行试验,用纹影方法来观察实验模型的流场结构,通过静压测点来测量实验模型的壁面压力.研究结果表明:数值与试验结果吻合较好;对平板横向射流,增大射流角度能增大射流上游的分离区,弓形激波位置更靠前,角度增加到一定大小,流场结构变化不再明显;对射流控制矢量喷管进行数值模拟得出,增大射流角度能有效提高喷管的推力矢量性能,在NPR为 4.6,SPR为0.7条件下,射流角度从90°增加到130°,推力矢量性能提高28.3%.

Effects of jet injection angle in a flat transverse flow

The computational and experimental studies were conducted to investigate the effects of the jet injection angle on the flat flow structure and its operating characteristics, the conclusions were made to apply on the fluidic control vectoring nozzle. The experiments were performed in a small wind tunnel test bed. The schlieren method was used to observe the flow structure and the wall pressure distribution of the test model was measured by the static pressure measuring point. The results show that the computational and experimental results are in good agreement. Increasing the transverse injection angle can improve the jet upstream of the separation zone, and make the bow shock position closer to the top. However, the change of the flow structure is no longer obvious when the transverse injection angle big enough. The numerical simulation of fluidic control vectoring nozzle indicates that the increase of the transverse injection angle can improve the thrust vectoring performance effectively. To be specific,the thrust vectoring performance raises by 28.3% when the transverse injection angle change from 90° to 130°, on the conditions that NPR equaled 4.6 and SPR equaled 0.7.