关键词: 人字形小肋, 激波/边界层干扰, 流动控制, 风洞实验, 压敏漆

Abstract: 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.

Key words: Herringbone riblets, Shock wave boundary layer interactions, Flow control, Experimental test, Pressure sensitive paint