426 / 2018-12-27 15:52:28

来流湍流度对燃气轮机透平第一级动静叶外换热的影响 Effect of Turbulence on External Heat Transfer for the First Stage Vanes and Blades of Heavy Duty Gas Turbine

湍流度，传热 turbulence; heat transfer

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本文以某重型燃气轮机透平第一级动静叶的叶型为研究对象，基于OpenFOAM平台采用叶栅三维粘性流的数值计算方法，研究了不同进口来流湍流度下，动静叶表面的压力分布和对流换热系数的分布特征，叶片不同区域的换热系数随来流湍流度而变化的特点及其对叶片冷却结构设计的影响。结果表明：来流湍流度对动静叶片表面的压力分布影响较小；来流湍流度对静叶表面外换热的系数影响较为显著，叶片外表面换热系数随来流湍流度的增大而升高，但增强的幅度逐渐减小。动叶表面换热受湍流度影响较小，仅前缘区域换热情况变化明显；在叶片表面的不同位置，湍流度对换热特性的影响程度有较大差别。基于此研究，在透平叶片传热设计过程中，需要合理地考虑来流湍流度的影响。
On the basis of OpenFOAM platform, the three-dimensional viscous flow numerical calculation method of cascade is used to calculate the first stage blade and vane of a heavy-duty gas turbine. The pressure and the heat transfer coefficient distribution on the blade surface under different inlet turbulence levels are studied. And its effect on the cooling structure design of the blade are also analysed. The computational results show that the turbulence of incoming flow has little effect on the pressure distribution on the surface of the turbine vanes and blades. The external surface heat transfer coefficient of the vanes increases with the increasing level of the turbulence, but the amplitude of the enhancement decreases. And the blade surface is less affected by the turbulence, while the leading edge region is obviously changing. And its effect is quite diffident at different positions on the blade surface. Therefore, the effect of the turbulence levels should be considered reasonably during the thermal and cooling design of turbine vanes and blades.