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中文摘要：
提出一种用数学模型来研究重载机车冷却风机内部流场和气动性能的方法,并实现前导叶优化。采用RNG k-epsilon湍流模型和SIMPLE算法,分析了风机稳态流场和压力分布规律。计算7种前导叶结构尺寸的性能参数,以确定高效节能的最佳设计方案。结果表明：静压总体呈现先减小后增大的趋势,而全压先减小后增大再减小;叶片工作面静压分布均匀,非工作面梯度较大;前导叶叶片曲率半径200mm、圆弧叶片夹角为40°、叶片数13片时,可满足额定工况要求。
英文摘要：
In this paper, a numerical model has been proposecl to study the inner flow field and aerodynamic performance and to optimize the front guide vahe. The RNG k-epsilon turbulence model and the SIMPLE algorithm were applied to this simulation to analyze the steady flow field and pressure distribution. Seven disparate structures of front guide vanes were compared to determine the best design for high-efficiency and energy-saving. results elucidate that the static pressure decreases first and then increases, the total pressure increases after decreased first and then decreases. Compared to the homogeneous distribution in front side of vane, the pressure gradient in the back side is great. The front guide vane with 400-millimeter-diameter, 40-degree angle and 13 blades can meet the requirements of rated condition.
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