| 掺气坎射流出射角的修正方法 |
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| 引用本文： | 张法星,徐建强,徐建军.掺气坎射流出射角的修正方法[J].人民长江,2010,41(2):87-90. |
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| 作者姓名： | 张法星 徐建强 徐建军 |
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| 作者单位： | 中国水电顾问集团,华东勘测设计研究院,浙江,杭州,310014 |
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| 摘 要： | 掺气坎后射流出射角受到来流水深和射流紊动扩散的影响,不等于挑坎的挑角,计算掺气空腔长度时,应该对出射角进行修正。而目前采用的考虑紊动扩散对出射角影响的修正方法存在不合理的假设。考虑到坎末水流流态为充分发展的紊流,射流边缘处于紊动能耗散区,提出了一种紊动扩散对出射角影响的修正方法。采用该方法计算的射流紊动扩散角与试验结果更吻合。对出射角修正后,结合简单的抛射体公式,就能较精确地估算掺气空腔长度。
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| 关 键 词： | 掺气坎 掺气减蚀 出射角 空腔长度 紊动扩散 |
Correction method for emergence angle of jet flow over aerator |
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| ZHANG Faxing,XU jianqiang,XU Jianjun.Correction method for emergence angle of jet flow over aerator[J].Yangtze River,2010,41(2):87-90. |
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| Authors: | ZHANG Faxing XU jianqiang XU Jianjun |
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| Affiliation: | ZHANG Faxing,XU jianqiang,XU Jianjun(East China Investigation , Design Institute,CHECC,Hangzhou 310014,China) |
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| Abstract: | Being affected by water flow depth and turbulent diffusion,the emergence angle of the jet flow over an aerator is unequal to the geometry angle of aerator ramp.It should be corrected when the cavity length is calculated.We present a new correction method with consideration of the affection of turbulent diffusion on the emergence angle,considering that the water flowing over an aerator is a full developed turbulent channel flow and the jet edge flow is belong to turbulent kinetic energy dissipation region.Th... |
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| Keywords: | aerator aeration cavitation-alleviation emergence angle cavity length turbulent diffusion |
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