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水轮发电机组在运行中,往往由于水轮机组过流通道内生产的水压脉动致使机组或机组部件产生振动或共振。其中尾水管内所汇集和产生的具有各种频率的水压脉动常常成为这种振动的水力振源。国内外不少机组就是由于受到这种振源的激发而产生较大的机械振动和压力钢管水锤波共振以及与发电机共振而产生的功率摆动等等。有鉴于此,为了改善机组运行和防止事故的发生,在尾水管壁上,合理地布置测压孔并准确地测量和分析尾水管内的水压脉动实属非常必要。 本文根据一些国内外资料,其中主要是来自笔者所作过的水轮机模型机组的试验结果来简述在尾水管壁上合理地布置测压孔的必要性和采用环形管电测压力脉动的无可比拟的优点。
During operation, hydro-generator units often cause vibration or resonance of the unit or the unit components due to water pressure pulsations generated in the over-flow passage of the water turbine unit. The hydraulic pulsations with various frequencies collected and produced in the draft tube often become the vibration source of water vibrations. Many domestic and foreign units are due to the excitation of this vibration source and produce greater mechanical vibration and pressure pipe water hammer wave resonance and resonance with the generator power swing and so on. In view of this, in order to improve the operation of generating units and prevent accidents, it is necessary to properly arrange the pressure measuring holes and accurately measure and analyze the water pressure pulsation in the draft tube on the draft tube wall. This article based on some domestic and foreign information, mainly from the turbine turbine unit made by the author of the test results to a brief description of the need for tailor-made pipe wall pressure rationally arranged on the pressure measurement and the use of annular pipe pressure pulsation of no Compared to the advantages.