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首页> 外文期刊>International Journal of Heat and Fluid Flow >Pressure-sensitive paint on a truncated cone in hypersonic flow at incidences
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Pressure-sensitive paint on a truncated cone in hypersonic flow at incidences

机译:入射时高超声速截锥上的压敏涂料

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The flow over a truncated cone is a classical and fundamental problem for aerodynamic research due to its three-dimensional and complicated characteristics. The flow is made more complex when examining high angles of incidence. Recently these types of flows have drawn more attention for the purposes of drag reduction in supersonic/hypersonic flows. In the present study the flow over a truncated cone at various incidences was experimentally investigated in a Mach 5 flow with a unit Reynolds number of 13.5 × 10~6 m~(-1). The cone semi-apex angle is 15° and the truncation ratio (truncated length/cone length) is 0.5. The incidence of the model varied from -12° to 12° with 3° intervals relative to the freestream direction. The external flow around the truncated cone was visualised by colour Schlieren photography, while the surface flow pattern was revealed using the oil flow method. The surface pressure distribution was measured using the anodized aluminium pressure-sensitive paint (AA-PSP) technique. Both top and sideviews of the pressure distribution on the model surface were acquired at various incidences. AA-PSP showed high pressure sensitivity and captured the complicated flow structures which correlated well with the colour Schlieren and oil flow visualisation results.
机译:截锥的流动由于其三维和复杂的特性而成为空气动力学研究的经典和基本问题。当检查大入射角时,流动变得更加复杂。近年来,这些类型的流已引起更多注意,以减少超音速/超人流的阻力。在本研究中,以马赫数为5的单位雷诺数为13.5×10〜6 m〜(-1)的Mach流实验性地研究了截锥上各种入射角的流量。圆锥半顶角为15°,截断比(截断长度/圆锥长度)为0.5。模型的入射角在-12°到12°之间变化,相对于自由流方向的间隔为3°。截锥周围的外部流动通过彩色Schlieren摄影技术可视化,而表面流动模式则通过油流方法显示出来。使用阳极氧化铝压敏涂料(AA-PSP)技术测量表面压力分布。模型表面上压力分布的俯视图和侧视图都是以各种入射角获得的。 AA-PSP具有较高的压力敏感性,并捕获了复杂的流动结构,这些结构与Schlieren颜色和油流可视化结果密切相关。

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