论文部分内容阅读
通过数值求解柱坐标系下三维定常粘性雷诺时均N-S方程,结合RNGk-ε湍流模型和非平衡壁面函数,获得了超微涡轮中极低展弦比静叶栅流道内部的三维稳态粘性流场,揭示了其独特的流场物理特性和气动损失规律.结果表明:超低展弦比涡轮叶栅中存在双二次流现象;尽管超微燃气涡轮静叶栅高度仅为1.3 mm,壁面影响区占叶高的总高度仍不超过3%;叶片的静压载荷主要由中部弧段承担;总压损失主要发生在近壁区,尤其是吸力面近壁区;静叶栅径向各截面最大马赫数并不是出现在主流中央,而是介于主流中央和壁面之间的一个狭小区域,这可能与通道低能二次流与主流的掺混作用有关.
The three-dimensional steady-state viscous viscoelasticity of very low aspect ratio static cascade runner in an ultra-turbo turbine is obtained numerically by solving the three-dimensional Reynolds-averaged Navier-Stokes equations in the cylindrical coordinate system, combining the RNGk-ε turbulence model and the unbalanced wall function The results show that there exists a double secondary flow phenomenon in the ultra-low aspect ratio turbine cascade. Although the height of the stator blade of the ultra-micro gas turbine is only 1.3 mm, The total height of the influence area of the wall occupying less than 3% of the total height of the leaf; the static pressure load of the leaf is mainly borne by the middle arc; the total pressure loss mainly occurs in the near wall area, especially in the near wall area of the suction surface; The maximum Mach number of each section does not appear in the mainstream center, but in a narrow area between the mainstream center and the wall, which may be related to the channel low-energy secondary flow and mainstream mixing.