高速突扩流空化初生及比尺效应试验研究(杨庆; 张建民; 戴光清; 李鹏)

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#N/qJ~*nO-r0高速突扩流空化初生及比尺效应试验研究

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0Z4nCn PK0【作者】杨庆; 张建民; 戴光清; 李鹏 【作者单位】四川大学水力学与山区河流开发保护国家重点实验室

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【论文摘要】 泄水建筑物的设计必须考虑高速水流产生的空化空蚀问题,由于空化的形成机理和影响因素极为复杂,泄水建筑物初生空化数,往往仅能通过模型试验获得.但模型与原型的初生空化数之间存在着较大的差异,即空化的比尺效应.为了研究高流速下(V>15.0m/s)空化初生及比尺效应,对不同台阶高度的突扩流进行系列空化试验.试验结果表明,Keller 提出的空化比尺效应在 V>15.0m/s 时不再适用,不同体型的初生空化基准值σ0不同。对于突扩流,初生空化数与台阶高度和突扩比呈线性递增关系,参考 Keller 修正公式模型,得出突扩体型的参考流速 V0=55.0m/s 和各自的基准值.该公式适用于流速50.0m/s 量级的水利工程, 其预报值与实测值之间的误差较小.

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【英文论文摘要】 The design of discharge structure must consider the cavitation issue which is brought by high-speed flow,because the formation mechanism and impact factors of cavitation are quite complex,the incipient cavitation number of discharge structure can often be gotten only through the model test.However,between the number of prototype model and physical model there exist large differences,that is,called the scale effect of cavitation.In order to study the cavitation incipience and scale effect under high-velocity (V>15.0m/s),a number of cavitation test have been done on sudden enlargement flow of different step high level.The results showed that,the scale effect of the cavitation put by Keller will no longer be applicable (V>15.0m/s),the datum value of incipient cavitation number,σ0 are different at variable bodily form.To sudden enlargement flow, the incipient cavitation number keep a linear increase relation with the step height and sudden enlargement rate,consulting the Keller form...更多ula model,the reference value of velocity V0=55.0m/s and each datum value of different sudden enlargement form have been educed.The formula is applied to the water engineering,of which the velocity level is 50.0 m/s,the error between it's forecast value and the actual measured value is smaller.  还原

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A${j WgYq0【论文关键词】 空化; 突扩流; 初生空化数; 比尺效应
%Im%pH%[7xF.A0【英文论文关键词】 cavitation sudden enlargement flow incipient cavitation number scale effect
i+ry;D0rX$c M u^0【基金】国家自然基金资助(NO:50209010,NO:50779041)水利论文rz:fZ#GI1oI h:L

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TAG: 空化 李鹏 张建民 杨庆 戴光清
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