| 摘要: |
| 输水阀门在高水头作用下极易发生空化空蚀，威胁阀门安全，本文旨在寻找阀门内部合理的掺气位置与布置方案，通过掺气后形成的掺气水流能有效抑制空化空蚀破坏。针对应用于有压管道的锥形阀门开展研究，建立数学模型，计算锥形阀门流场结构及压力分布特征，分析阀门开度及锥体角度对低压区的影响，确定流道内部稳定的低压位置，在此基础上进行局部优化，提高流态和掺气效果的稳定性。研究结果表明，锥形阀门出流时，在套筒出口下缘、固定锥体出口位置产生低压，两处低压区均呈环向分布，且低压位置不随阀门开度和锥体角度改变，对套筒出口处局部进行优化后，出流更平顺，低压区的范围有所扩大，从而提高了掺气效果的稳定性，综合上述研究提出有压管道锥形阀门掺气减蚀方案，最后通过物理模型试验验证在负压区环向均匀布置掺气孔能够有效抑制空化。 |
| 关键词: 锥形阀门、流场结构、压力分布、掺气减蚀、流道优化 |
| DOI： |
| 分类号:TV672.2 |
| 基金项目: |
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| Cavitation controls of cone valves |
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Xiang Maoming1, XueShu1, Zhao Bin2, Li Guisheng2
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1.Nanjing Hydraulic Research Institute;2.China Energy Engineering Group Guangxi Electric Power Design Institute
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| Abstract: |
| Water valve in the high head action is very easy to occur cavitation, threatening the valve safety, according to engineering practice, the formation of gas doping inside the valve doped water flow can effectively inhibit cavitation damage, aeration location selection and layout scheme is related to the doped whether it is easy to realize. In this paper, the cone valve used in pressurized pipelines to carry out research, the establishment of two-dimensional mathematics, calculate the flow field structure of the cone valve and the pressure distribution characteristics, analyze the valve opening and the cone angle on the low-pressure region of the impact of the channel to determine the stable low-pressure position, on the basis of which local optimization to improve the stability of the flow pattern and the effect of aeration. The results show that the cone valve outflow, in the lower edge of the sleeve outlet, fixed vertebrae outlet position generates low pressure, both low-pressure zone was ring distribution, and low-pressure position does not change with the valve opening and vertebrae angle, the sleeve outlet for local optimization, the outflow is smoother, the range of low-pressure zone has been enlarged, so as to improve the stability of the effect of aeration, the synthesis of the above research puts forward the pressurized pipeline cone valve aeration corrosion reduction program, and finally through the physical model test to verify that the negative pressure area in the ring direction of the uniform arrangement of aeration holes can effectively inhibit cavitation. |
| Key words: cone valve, flow field structure, pressure distribution, aeration cavitation reduction, flow path optimization |
