“人字形小肋”对激波/边界层干扰的影响研究

在曼彻斯特大学跨声速风洞开展激波/边界层干扰及“人字形小肋”对其影响的实验研究。在马赫数1.85流场条件下，应用高速纹影、油流、皮托压力测量和基于压敏漆的壁面压力测量技术，研究“人字形小肋”流动控制方法对激波/边界层干扰的流动分离结构与尺寸、压力分布特性与波系特征等影响。结果显示激波/边界层干扰诱发流动分离，分离区呈现三维特征，在“人字形小肋”的作用下，分离线呈现“波浪”形且整体向上游移动，干扰区流向尺寸增大，分离区高度减小且长度略增大，再附区的压力极值降低，这些特征与叶片、尖楔等微涡发生器的影响趋势相反。下一步工作中，拟针对“人字形小肋”开展参数优化研究，“人字形小肋”可能成为降低激波/边界层干扰诱发的高热流载荷的有效方法。

Effects of Herringbone Riblets on Shock Wave BoundaryLayer Interactions

Experiments are conducted on investigating the shock wave/boundary layer interaction (SWBLI) and the effects of Herringbone riblets on SWBLI in the transonic wind tunnel located at the University of Manchester. Herringbone riblets are employed to study their effect on the flow separation, pressure distribution and characteristics of waves of SWBLI at Mach number of 1.85. The nature of flow field is studied by a combination of techniques, such as high-speed schlieren, oil flow, Pitot pressure measurement and pressure sensitive paint. The boundary layer separates as the incident shock impinge on the floor and the flow field is inherently three-dimensional according to the flow topology based on the oil flow results. Under the influence of the Herringbone riblets, the separation line behaves wavy and moves upstream, which leads to a longer separation zone. Meanwhile, the maximum value of pressure distribution decreases. Compared to the traditional micro vortex generators, the Herringbone riblets behave an adverse trend on the flow separation and pressure distribution. Furthermore, the parameter optimization on the Herringbone riblets would be performed and it might become a potential method for reducing the peak value of pressure distribution and heat flux for SWBLI.