多射流的流动特性分析

为获得多射流的流体动力学特性和了解多射流降噪优势 ,采用总压测量、流动显示、声学测量等手段 ,通过对多射流进行了不同压比下、沿射流中心线不同位置处的总压测量研究 ,指出多射流相对单射流而言具有降噪的优势 ,其原因是多射流的汇聚耦合消弱了与激波结构相关的宽频噪声 ,平缓了湍流的混合噪声 ,多射流的内环低压区的形成可以抑制射流的扩散

Interaction of multiple jets

Very few studies have described the performance of high speed multiple jets. This investigation is conducted to understand the characteristics and advantages of noise reduction for multiple jets. Measurements are presented of the total pressure field at various positions along the centerline of the multiple jets. The investigation shows that the main advantages of multiple jets is the noise reduction caused by the interaction of the multiple jets which attenuates the noise associated with the shock. The low total pressure of the inner region is measured which leads to the low jet spread.