HL（820）－LJ－550水轮机及其在三门峡水电站应用性能分析

根据三门峡水电站的扩建条件和原则，经技术论证，６号机组选用了ＨＬ（８２０）－ＬＪ－５５０混流式水轮机。该机具有应用水头较适宜。效率较高且高效区较宽、出力能力强等特点。由于ＨＬ（８２０）－ＬＪ－５５０水轮机与现有机坑安装匹配存在一定的问题，为此进行了模型试验。结果表明，该机能量特性较优，气蚀特性也较好，但尾水管压力脉动过大，并伴有强烈的噪音。为此，在模型上进行了两种措施试验，其中尾水管短管补气对减轻振动及降低噪音效果良好，决定在真机上采用。ＨＬ（８２０）－ＬＪ－５５０水轮机试运行的情况表明，机组出力正常，但两套短管补气装置均未达到明显的减振及降噪效果。一系列的试验研究及试运行观测表明，ＨＬ（８２０）－ＬＪ－５５０水轮机在三门峡水电站的应用是成功的。

Function Analysis of HL (820)-LJ- 550 Turbine Application in Sanmen Gorge Hydropower Station

ixed flow turbine, which is characterized with suitable application water head. high efficiency with wide range and output plus. was selected for the sixth generating unit according to the extension conditions and regulations in Sanmen Gorge Hydropower Station and after demonstration.Some model tests had been taken for the matching between room and PO45 turbine. and resultedin that the turbine is with perfect performance in energy and air erosion but meantime with strongpress pulsation at tail water tube and noise. In order to settle the problems in the model, twotreatment were tested, in which the way of air infusion to the tail water tube is very effective inlightening the noise and decided to be applied in practice. HL (820)-LJ-550 hydraulic tubine operation is in normal output, however not with evident viberation absorption and noise reduction.Various tests indicates that the application of HL (820)-LJ-550 turbine is successful in SanmenGorge Hydropower Station.