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直接空冷汽轮机组背压受气象条件变化大,造成低压转子运行工况变化大,给末级叶片设计带来新的要求,但未见国内外有报道对直接空冷机组末级流场和湿蒸汽进行过实测研究。作者用新研制的改进型联合探针对某电厂300MW直接空冷机组低压汽轮机末级流场和蒸汽湿度进行了测量。测量结果表明汽流速度从叶根到叶顶逐步增,但静压则基本不变。本文给出了流场测量的所有结果。
Direct air-cooled turbine backpressure by the meteorological conditions change, resulting in low-pressure rotor operating conditions change, to the final stage blade design brings new requirements, but no domestic and foreign reports on the direct air-cooled unit last stage flow field and wet steam Conducted a measured study. The authors use the newly developed improved probe to measure the final stage flow field and steam humidity of the low pressure turbine of a 300 MW direct air-cooled unit in a power plant. The measurement results show that the steam flow rate gradually increases from the root to the top of the blade, but the static pressure is basically unchanged. This article gives all the results of flow field measurements.