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Experimental studies of a model pump-turbine S-curve characteristics and its improvement by misaligned guide vanes (MGV) were extended to prototype pump turbine through 3-D transient flow simulations. The unsteady Reynolds-averaged Navier-Stokes equations with the SST turbulence model were used to model the transient flow within the entire flow passage of a reversible pump-turbine with and without misaligned guide vanes during turbine model start-up. The unstable S-curve and its improvement by using misaligned guide vane were verified by model test and simulation. The transient flow calculations were used to clarify the variations of pressure pulse and internal flow behavior in the entire flow passage. The use of misaligned guide vanes can eliminate the S-curve characteristics of a pump-turbine, and can significantly increase the pressure pulse amplitude in the entire flow passage and the runner radial forces during start-up. The MGV only decreased the pulse amplitude on the guide vane suction side when the rotating speed was less than 50% rated speed. The hydraulic reason is that the MGV dramatically changed the flow patterns inside the entire flow passage, and destroyed the symmetry of the flow distribution inside the guide vane and runner. 相似文献
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监测和识别原型水泵水轮机无叶区的流动状态,对于保证抽水蓄能电站的运行安全性和稳定性有非常重要的意义。本文提出了一种基于经验小波变换、散布熵和卷积神经网络原理的流态特征提取和识别方法,首先使用经验小波变换对压力脉动信号进行分解,然后通过计算各分量的散布熵提取流态相关特征,最后通过利用特征–标签对训练卷积神经网络得到的智能识别模型,实现了无叶区流态识别。利用从国内某水泵水轮机采集到的发电、抽水和空转工况下实测压力脉动信号对该方法进行了测试,测试的平均准确率达到了94.84%,证明了该方法的有效性。
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为解决高层居民住宅生活用水和消防用水,一般均设置水泵房,若水泵房设计安装不当,将成为扰民的噪声源和振动源。本文以上海几栋高层住宅水泵房为例,通过采取隔振,软联接等措施,有效地控制了振动传递,降低了噪声,达到了环保标准要求。 相似文献
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如果中央空调制冷实验设备中水泵选择不当,会使系统运行不正常,或者导致能量消耗加大,这都将造成工程的失败,因此,合理选择循环水泵具有重要的意义。以某中央空调制冷实验设备设计为例,说明水泵的合理选择方法。其对中央空调设计具有一定的参考价值。 相似文献
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从供水系统整体优化和能量损耗最小的角度出发,结合供水厂生产的实际特点,建立了基于遗传算法的水泵机组优化组合的数学模型,并对该数学模型进行求解,得到较为满意的最优解或次优解.实际生产表明,利用遗传算法求解水泵机组优化组合的数学模型,对水泵机组进行优化调度,取得了良好的经济效益. 相似文献
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