| 陈永平,李志伟,谭鹰勋,张长宽.不规则波作用下垂向圆管射流的试验研究[J].水利学报,2008,39(2): |
| 不规则波作用下垂向圆管射流的试验研究 |
| Experimental study on flow characteristics of vertical round jet discharged into ambient with random wave |
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| DOI： |
| 中文关键词: 不规则波 圆管射流 试验研究 |
| 英文关键词: round non buoyant jet random wave ambient experimental study |
| 基金项目: |
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| 中文摘要: |
| 利用三维超声波测速仪(ADV)对不规则波作用下垂向圆管射流的流场进行了测量。通过与静水条件下圆管射流流场的比较，发现在不规则波作用下射流轴线速度明显减小、射流范围相应增大、周围水体对射流的稀释能力也明显增强；随着波浪强度的增大，射流紊动强度有所加强，而峰值位置则逐渐前移。本文采用因次分析方法对试验数据进行了分析，通过引入长度尺度lm将波浪作用下的射流划分成三个区域：z/lm≤0.1为射流主导段；0.11为波浪主导段。通过对试验数据的曲线拟合，建立了各个区域段内射流轴线流速和射流宽度的经验公式。 |
| 英文摘要: |
| The flow fields of the vertical round jet discharged into the ambient with random wave were measured by 3 D acoustic Doppler velocity meter. The analysis of experimental data shows that the axial line velocity of jet in random wave ambient decays faster than that in still ambient, the expansion speed is accelerated and the effect of dilute by surrounding water is obviously enhanced. The turbulent intensity of the jet will be enhanced if the intensity of wave is increased. The location of peak turbulence shifts towards the inlet of jet under the effect of wave and the shifted extent is related to wave period and wave height, which indicates that the jet turbulence is generated both by the motion of wave and jet. The analysis on experimental data by dimensional analysis method shows that the whole flow field can be partitioned into three regions: jet dominant region, transitional region and wave dominant region. A group of empirical formulas for predicting the axial velocity of jet and half width velocity are derived based on the least squares fitting of the experimental data. |
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