现代大功率汽轮机排汽缸的气动性能

The Aerodynamic Performance of Modern Large Steam Turbine Low Pressure Exhaust Hood

本文详细讨论了现代大功率汽轮机排汽缸的流动特点对其气动性能的要求及对机组的各种影响。指出,当缸的进口马赫数达到一定值时,缸的损失系数呈转折性增长的趋势;缸发生阻塞时的极限马赫数取决于其损失值的大小。阐述了影响排汽缸气动性能的各种因素。最后提出了提高排汽缸气动性能的途径。

The flow characters and the requirement for aerodynamic performance of modern large steam turbine exhaust hood,and their several effects on the steam turbine are discussed in detail. The paper points out that the loss coefficient tends to increase abruptly when the hood inlet Mach number attains a certain magnitude. The limit Mach number as the chock condition in hood depends on its loss value. Many factors effecting the hood aerodynamic performance are described. The approach improving the hood aerodynamic performance is suggested.