汽轮机末级静叶水滴沉积规律与缝隙去湿研究

Study of the Law Governing the Water Droplet Deposition and Wetness Removal From the Stationary Blades at the Last Stage of a Steam Turbine

采用Fluent软件对某600 MW汽轮机末级静叶栅中的水滴三维运动与沉积规律进行了数值计算,确定了水滴在静叶轴向和径向的沉积位置;实验研究了空心叶栅缝隙抽吸的去湿性能。结果表明:静叶内弧上的沉积水量占叶栅进口总水量的12.2%,背弧的沉积水量占1.6%;静叶内弧上的缝隙抽吸水量大于背弧上的抽吸水量,缝隙位置越靠近静叶出口边,抽吸水量也越大;随着缝隙宽度的增大,缝隙抽吸水量先降低后增大,在宽度为3.0 mm左右时达到较低值;缝隙抽吸水量随抽吸压差的增大而增大,随着主气流速度的增大而很快减小。

By using software Fluent,numerically calculated was the law governing the 3-D water droplet movement and deposition in the last stationary blade cascade of a 600 MW steam turbine with the locations of the deposition of the water droplets on the stationary blades in the axial and radial direction being determined.Subsequently,an experimental study was conducted of the water removal performance of the suction from slots on the hollow blade cascade.It has been found that the water quantity deposited on the con...