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数值模拟了截面为等腰三角形的棱柱在不可压牛顿流体中的二维绕流问题,分析了不同的截面尺度比以及三角形顶点迎风和背风安置时的尾流稳定性与阻力系数.研究发现对于较大截面尺度比的棱柱,在相同雷诺数的情况下顶点迎风相较于顶点背风的情况更易失稳从而产生侧向力,但阻力系数相对较小,当雷诺数为160时,最多能够减少19.4%.进一步地对比研究了顶点迎风与顶点背风在不同截面尺度比时升、阻力系数及涡脱落频率随雷诺数的变化关系.
Numerical simulation of two-dimensional flow around an isosceles triangular prism in an incompressible Newtonian fluid is carried out. The stability of the wake and the drag coefficient are analyzed when the cross-sectional aspect ratio is different and the triangular apex windward and leeward position are set. Prisms with larger cross-section scale ratios are more prone to lateral instability at the same Reynolds number than the apex leeward, but the drag coefficient is relatively small. At a Reynolds number of 160, the maximum can be reduced 19.4% .Furthermore, the relationships between the upwind wind speed and the apex leeward ratio at different cross sections, the drag coefficient and the vortex shedding frequency with the Reynolds number are further studied.