翼型表面开孔对其空化性能的影响

为研究微孔对NACA5412翼型空化性能的影响,采用欧拉多相流模型和RNGk-ε湍流模型对13种不同的NACA5412翼型结构进行绕流流场数值计算,分析了不同翼型结构周围的压力分布。研究结果表明:无孔翼型上方低压区范围要大于下方,不同翼型结构的上、下方压力变化趋势是由大变小再变大;微孔改变了绕流无孔翼型的流场,减小了低压区的范围,抑制了空化初生;在本文研究的面积比从0.0017%到0.1629%中1.5 mm梅花形孔(0.0917%)翼型周围的低压区范围是最小的;研究成果可以为后续更进一步的研究解决水力机械的空化空蚀问题提供理论依据。

The Effect of Airfoil Perforation on Its Surface Cavitation Characteristics

In order to study the effect of micropores on the cavitation performance of NACA5412 airfoil,the Euler multiphase flow model and the turbulence model are used to calculate the flow field around 13 different NACA5412 airfoil structures,and analyze the pressure distribution around different airfoil structures.The results show that range of the lower pressure zone above the non-porous airfoil is larger than that of the below.Moreover,both of upwards and downwards pressures of different airfoil structures-firstly decreases and then increases.The micropores change the flow field of the non-porous airfoil around the flow,pull down The range of the low pressure zone,and suppress the initial cavitation occurs.The area ratio studied in this paper ranges from 0.0017%to 0.1629%,The 1.5mm quincunx hole(0.0917%)has a minimum range of low pressure regions around the airfoil.The research results can provide some basic theoretical basis for further research to solve the cavitation problem of hydraulic machinery.