本文選題：淹沒射流 + 湍流模型��； 參考：《水力發(fā)電學(xué)報》2017年01期

【摘要】：采用k-ε和LES大渦模擬兩種湍流模型對斜向射流入水墊塘的流場進行了三維數(shù)值模擬研究,得到了射流的流速、渦量、壓力等水力特性,并與粒子成像測速儀(PIV)得到的結(jié)果進行對比。結(jié)果表明,射流入水墊塘后其流態(tài)為典型的三維流態(tài),受射流上下游紊流渦的影響,射流軸線、速度及壓力分布呈現(xiàn)時空隨機性的特征。k-ε湍流模型因?qū)u的各向同性假設(shè),其計算結(jié)果不能反映斜向淹沒射流流場結(jié)構(gòu)的隨機性特征,而LES大渦模型則可獲得斜向淹沒射流流場的時空隨機性流場結(jié)構(gòu),如射流軸線、流速矢量分布、渦量場和壓力場,準(zhǔn)確揭示斜向淹沒射流入水墊塘的流場演變過程和消能的剪切、混摻機理,并與PIV測試結(jié)果吻合良好。
[Abstract]:Using k- 蔚 and les large eddy simulation models, the three-dimensional numerical simulation of the flow field of oblique jet into the water cushion pond is carried out. The hydraulic characteristics of the jet, such as velocity, vorticity and pressure, are obtained. The results are compared with those obtained by particle imaging velocimetry (PIV). The results show that the jet flow pattern is a typical three-dimensional flow pattern after entering the pool. The jet axis, velocity and pressure distribution show the characteristics of space-time randomness. K- 蔚 turbulence model assumes the isotropy of the vortex due to the influence of the upstream and downstream turbulent vortices of the jet, and the distribution of the jet axis, velocity and pressure shows the characteristics of randomness in time and space. The calculated results do not reflect the random characteristics of the flow field structure of oblique submerged jet, while the les large eddy model can obtain the spatio-temporal random flow field structure of the oblique submerged jet flow field, such as jet axis, velocity vector distribution, vorticity field and pressure field. The evolution process of flow field and the shear and mixing mechanism of energy dissipation of oblique submerged jet entering water cushion pond are accurately revealed, and the results are in good agreement with the PIV test results.
【作者單位】： 四川大學(xué)水力學(xué)與山區(qū)河流開發(fā)保護國家重點實驗室;四川大學(xué)水利水電學(xué)院;
【基金】：國家自然科學(xué)基金(51009102;51409181) 新世紀(jì)優(yōu)秀人才支持計劃(2011SCU-NCET-10-0589)
【分類號】：TV135.2

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