百万等级电站锅炉给水泵径向弯叶片空化性能研究

Research of Cavitation Performance of Radial Bending Blade on 1000 MW Boiler Pump

摘要: 本文以百万等级超超临界电站锅炉给水泵为研究对象，通过CFD技术对叶片空化性能进行数值研究。提出一种基于样条函数思想的径向弯叶片几何参数设计方法，引入“正弯叶片”和“反弯叶片”两种叶片径向弯曲结构。结果表明：“直叶片”必需空化余量为22.8 m，与试验值误差仅为0.2 m，预测结果具有一定的精度，“反弯叶片”必需空化余量为21.7 m，空化性能最优；“正弯叶片”在叶片进口处压力面最先出现空泡，吸力面空化面积最大，而“反弯叶片”吸力面空化面积最小。

Abstract: Numerical simulation of cavitation performances of 1000 MW ultra-supercritical pressure boiler feed pump was carried out through CFD applications. A new design method of geometric profile parameters based on Spline function was proposed. Two types of radial bending blades were in-troduced, i.e. “Forward Curved Blade” and “Reversed Curved Blade”. Results indicate that the NPSH (net positive suction head) of “Straight Blade” is 22.8 m, then the absolute error is 0.2 m. Compared with “Straight Blade” and “Forward Curved Blade”, “Reversed Curved Blade” has the best cavitation performance, and NPSH is 21.7 m. The vapor generated at pressure surface of “Forward Curved Blade” near the leading edge at first, and the cavitation region of suction surface is the largest, but the “Reversed Curved Blade” is opposite.