论文部分内容阅读
为了确保电厂的安全运行,许多工程师研究了水电厂的振动问题。但是,水电厂设置排砂底孔以后,排砂孔泄水是否会加剧水电厂的振动,对于这一类问题,迄今还没有比较深入的研究。长江葛洲坝二江电站设2台17万Kw和5台12.5万kw的水轮发电机组,电厂设有导砂砍和排砂底孔,设计总下泄流量2700m~3/s。虽然在设计过程中通过模型试验对设计方案作了论证,但是建成后的排砂孔运行性能如何,有关单位甚为关切。为此,我们在1982年2月、9月和1984年4月曾三次当排砂孔泄水时对电厂的动力响应进行了监测,1982年的监测主要是针对小机组厂段进行的。关于这次监测,已有专门报告。1984年的监测是研究大机组厂段在单孔和两孔泄水工况下的振动问题。监测了蜗壳、尾水管和下游工作门槽处的水脉动压力;和厂房的振动位移(图1);对实测资料进行了功率谱分析。本文论述了这次试验成果。
In order to ensure the safe operation of power plants, many engineers have studied the vibration problems of hydropower plants. However, there is no deep research on this kind of problems until whether the discharge of sand discharge hole will aggravate the vibration of hydropower plant after the bottom hole of sand discharge is set up in hydropower plant. Gezhouba Erjiang Power Station of the Yangtze River has 2 sets of 170,000 Kw and 5 sets of 125,000 kw hydro-generating sets. The power plant is equipped with guide sand-cutting and bottom-draining sand holes, and the total design discharge capacity is 2700m ~ 3 / s. Although the design scheme was demonstrated through the model test in the design process, the performance of the sand discharge hole after completion is very concerned by the relevant units. To this end, we monitored the dynamic response of the power plant three times in February 1982, September and April 1984 when the sand discharge was drained. The monitoring in 1982 was mainly aimed at small plant sections. There have been special reports on this monitoring. In 1984, the monitoring was to study the vibration problem of the large unit plant section under the condition of single-hole and two-hole drainage. The water pressure fluctuation at the volute, the draft tube and the downstream work gate was monitored; and the vibration displacement of the plant was monitored (Figure 1). The power spectra of the measured data were analyzed. This article discusses the results of this experiment.