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中文核心期刊

波浪环境中垂直射流紊动特性的实验研究

Experimental study on turbulent characteristics of a vertical jet in wave environment

  • 摘要: 利用粒子图像测速技术PIV(particle imagevelocimetry)对有限水深规则波浪环境下垂直射流紊动特性进行了实验研究. 应用相位分析法从测量数据中分离出速度脉动项,用4种不同波高的波浪研究波高对射流紊动特性的影响,对紊动量的分布以及大小进行了分析. 结果表明波高对射流的紊动特性有显著影响,并且对流项对波高的变化较紊动扩散项更为敏感,紊动扩散项量值约是对流项的1/8\sim1/3, 在时均化的N-S方程中起的作用不可忽略.

     

    Abstract: This paper presents a turbulent jet vertically discharged into a flow fieldof regular waves in the intermediate between deep and shallow water usingthe particle image velocimetry (PIV) technique. Phase average method wasused to extract the turbulent velocity from the PIV measurements. Four waveswith different wave heights were applied in the experiments. The resultsfirstly showed that the turbulent characteristics of jets are significantlyaffected by the wave height. The convection term is more sensitive than theturbulent diffusion term for the wave height change. In addition, the ratioof the turbulent diffusion term to the convection term is about 1 / 8\sim 1/ 3 to show that the effect of the turbulent diffusion can't be ignored intime-averaged N-S equations.

     

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