中压进汽腔的流场数值模拟比较

通过数值模拟计算,对中压对称进汽和切向进汽两种结构的流场进行了分析比较,结果表明,单一切向进汽腔的总压损失更小,出口汽流角的周向分布均匀度更好。更进一步,为整体评估中压进汽腔的流场以及对叶片级的流动影响,对中压进汽腔及第1级叶片的整体流体域流场情况进行了分析比较,结果表明,采用大几何角静叶的切向进汽腔气动性能最优;当采取切向进汽腔时,需合理选择第1级静叶几何角并耦合计算,才能实现进汽腔的气动优化。

Numerical Simulation Comparison on Flow Field of Inlet IP Chamber

The flow field of the two structures of medium pressure symmetric inlet chamber and tangential inlet chamber is analyzed and compared by numerical simulation.The results indicated that the total pressure loss of the single tangential chamber is smaller,and the circumferential distribution uniformity of exit steam flow angle is better.Furthermore,the flow field of the steam chamber evaluated as a whole fluid domain to analyze the whole flow field and the flow effect on the next static blades.The further results illustrated that the aerodynamic performance of the tangential inlet with large geometric angular static blades is optimal.In order to achieve the aerodynamic optimization of the tangential inlet chamber,the geometric angle of the first stage static blades should be selected reasonably and numerical simulated as a whole.