水泵水轮机制动工况导叶区流动特性分析
发布时间：2018-08-17 10:19
【摘要】：为研究水泵水轮机在水轮机制动工况运行时导叶区域产生异常紊动的内流机理,在完成S区特性试验的基础上,基于SST k-ω湍流模型及SIMPLEC算法,对活动导叶小开度制动工况进行非定常数值计算,并与试验数据进行对比验证,对此工况下水泵水轮机导叶区域流场结构和压力脉动规律进行了全面分析.研究结果表明:固定导叶与活动导叶后均存在不同程度的尾迹结构,活动导叶后涡系结构的演变和能量转化是诱发导叶区流动不稳定的主要原因之一;活动导叶进口的复杂流动也增加了冲击损失,对导叶振动造成一定影响;对活动导叶区的压力脉动监测进一步佐证了导叶区流动的不稳定性;通过对时域特性和频域特性的分析发现其相对幅值达到了水轮机及水泵正常运行工况的3倍以上,其主频为叶频,幅值较大且属中频成分,可能引发共振效应.研究结果可为水泵水轮机设计优化提供指导意义.
[Abstract]:In order to study the internal flow mechanism of abnormal turbulence in the guide vane region of a pump turbine under braking condition, the unsteady value of the small opening braking condition of the guide vane was calculated based on the S ST k-_turbulence model and SIMPLEC algorithm on the basis of the S zone characteristic test, and the results were compared with the experimental data. The flow field structure and pressure fluctuation in the guide vane region of a pump turbine are analyzed comprehensively. The results show that the wake structure exists in different degrees after the fixed guide vane and the movable guide vane. The complex flow also increases the impact loss, which has a certain impact on the guide vane vibration; the pressure fluctuation monitoring in the guide vane region further confirms the instability of the flow in the guide vane region; through the analysis of the time-domain and frequency-domain characteristics, it is found that the relative amplitude is more than three times of the normal operating conditions of the turbine and pump, and the main frequency is the blade. Frequency, amplitude and medium frequency components may cause resonance effect. The results can provide guidance for design optimization of pump turbine.
【作者单位】： 兰州理工大学能源与动力工程学院;甘肃省流体机械及系统重点实验室;
【基金】：国家自然科学基金资助项目(51566009)
【分类号】：TK730.1
[Abstract]:In order to study the internal flow mechanism of abnormal turbulence in the guide vane region of a pump turbine under braking condition, the unsteady value of the small opening braking condition of the guide vane was calculated based on the S ST k-_turbulence model and SIMPLEC algorithm on the basis of the S zone characteristic test, and the results were compared with the experimental data. The flow field structure and pressure fluctuation in the guide vane region of a pump turbine are analyzed comprehensively. The results show that the wake structure exists in different degrees after the fixed guide vane and the movable guide vane. The complex flow also increases the impact loss, which has a certain impact on the guide vane vibration; the pressure fluctuation monitoring in the guide vane region further confirms the instability of the flow in the guide vane region; through the analysis of the time-domain and frequency-domain characteristics, it is found that the relative amplitude is more than three times of the normal operating conditions of the turbine and pump, and the main frequency is the blade. Frequency, amplitude and medium frequency components may cause resonance effect. The results can provide guidance for design optimization of pump turbine.
【作者单位】： 兰州理工大学能源与动力工程学院;甘肃省流体机械及系统重点实验室;
【基金】：国家自然科学基金资助项目(51566009)
【分类号】：TK730.1
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