论文部分内容阅读
制造克拉斯诺雅尔斯克水电站的水轮机要求提高新转轮的比转速。在提高效率和不过多地增大水轮机汽蚀系数的同时要提高比转速是很复杂的。大家知道,上述要求从本质上说是矛盾的,因为比转速的提高通常带来效率下降和汽蚀性能变坏,这是因为转轮叶片间通道和整个区域以及其他通流部分内的相对速度都大大地提高了。看来,为了避免转轮区域内的平均速度和叶片局部地方的相对速度提高太多,必须重新研究和彻底推翻确定这种比转速的转轮基本几何尺寸间关系的现行标准,并制订新的水力计算方法,这种方法通过合理的叶片绘型能有把握按需要改变转轮叶片表面的局部速度值。
Turbines that make Krasnoyarsk hydroelectric power station require increasing the specific speed of the new runner. It is complicated to increase the specific speed while increasing the efficiency and not increasing the cavitation coefficient of the turbine. It is known to all that the above requirements are inherently contradictory since the increase in specific speed generally results in a loss of efficiency and a deterioration of cavitation performance due to the relative speed within the inter-rotor vane passages and throughout the area and other through-flow portions Have greatly increased. It appears that in order to avoid an increase in the average speed in the runner area and in the relative speed of the local parts of the blade it is necessary to re-examine and thoroughly reverse the current standards for determining the relationship between such specific rotational speeds of the basic geometrical dimensions and to develop new Hydraulic calculation method, this method through a reasonable blade mapping can be sure to change the local speed of the blade surface as needed.