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发展大功率汽轮机,关键之一在于长叶片的设计,末级叶片的长度决定了排汽量,从而也就决定了低压缸的数目和转子的长度,一台一百万千瓦的汽轮机,排汽量达8000～12000米~3/秒,如果是核电站,这个数字还要翻一番,而末级发出的功率大约占总功率的10%,所以从强度方面和效率方面都对长叶片提出十分苛刻的要求.对于末级长叶片的设计,大致上可规纳为下列四个相互影响的四个方面:1.选择各个断面上的速度三角形.
One of the keys to developing a high-power steam turbine is the design of a long blade. The length of the final blade determines the amount of steam discharged, which in turn determines the number of low-pressure cylinders and the length of the rotor. A 1 MW steam turbine, The amount of 8000 ~ 12000 m ~ 3 / sec, if it is a nuclear power station, this figure also doubled, and the last stage of the power of about 10% of the total power, so both in terms of strength and efficiency of the long leaves Very demanding requirements.For the design of the final long blade, can be generally accepted as the following four interactive four aspects: 1. Select the speed of each section of the triangle.