In order to study the cavitation damage in a side-wall when a sudden lateral enlargement and a vertical drop are imposed at the radial gate, a new arrangement-scheme is proposed, where the sudden lateral enlargement a...In order to study the cavitation damage in a side-wall when a sudden lateral enlargement and a vertical drop are imposed at the radial gate, a new arrangement-scheme is proposed, where the sudden lateral enlargement and the vertical drop can be imposed at the outlet of the gate chamber. The hydraulic characteristics along the side-wall are simulated by the detached eddy simulation and the Volume Of Fluid （VOF） method. The numerical results agree well with those of experiment. The experimental and numerical results show that the flow condition is smooth with only a weak water-wing appearing behind the lateral cavity, and the length of the lateral cavity becomes longer and is mainly affected by the size of the lateral enlargement and the zone of negative pressure after the water impacts the side-wall would disappear. The hydraulic characteristics of the new arrangement-scheme are beneficial to the prevention of the cavitation damage in the side-wall and the Detached Eddy Simulation （DES） with the VOF method can well predict the hydraulic characteristics after the new arrangement-scheme of the sudden lateral enlargement and the vertical drop.展开更多
针对煤化工专用控制阀易磨损失效的问题,提出基于数值模拟的阀内流场分析方法.今基于可实现k-ε(Realizable k-ε)双方程湍流模型,通过有限元分析法(finite element analysis,FEA),对控制阀的多相流流场中的湍流特征进行数值模拟研究,...针对煤化工专用控制阀易磨损失效的问题,提出基于数值模拟的阀内流场分析方法.今基于可实现k-ε(Realizable k-ε)双方程湍流模型,通过有限元分析法(finite element analysis,FEA),对控制阀的多相流流场中的湍流特征进行数值模拟研究,得到湍流流场内的压力、速度的分布,并结合Preston磨削经验公式,得到控制阀内最易磨损的区域,从而为后续控制阀的结构优化设计及表面强化打下了基础.展开更多
基金supported by the Natural National Science Foundation of China (Grant No. 50779041)the Ph. D. Program Foundation of Ministry of Education of China (Grant No.20060610039)
文摘In order to study the cavitation damage in a side-wall when a sudden lateral enlargement and a vertical drop are imposed at the radial gate, a new arrangement-scheme is proposed, where the sudden lateral enlargement and the vertical drop can be imposed at the outlet of the gate chamber. The hydraulic characteristics along the side-wall are simulated by the detached eddy simulation and the Volume Of Fluid （VOF） method. The numerical results agree well with those of experiment. The experimental and numerical results show that the flow condition is smooth with only a weak water-wing appearing behind the lateral cavity, and the length of the lateral cavity becomes longer and is mainly affected by the size of the lateral enlargement and the zone of negative pressure after the water impacts the side-wall would disappear. The hydraulic characteristics of the new arrangement-scheme are beneficial to the prevention of the cavitation damage in the side-wall and the Detached Eddy Simulation （DES） with the VOF method can well predict the hydraulic characteristics after the new arrangement-scheme of the sudden lateral enlargement and the vertical drop.
文摘针对煤化工专用控制阀易磨损失效的问题,提出基于数值模拟的阀内流场分析方法.今基于可实现k-ε(Realizable k-ε)双方程湍流模型,通过有限元分析法(finite element analysis,FEA),对控制阀的多相流流场中的湍流特征进行数值模拟研究,得到湍流流场内的压力、速度的分布,并结合Preston磨削经验公式,得到控制阀内最易磨损的区域,从而为后续控制阀的结构优化设计及表面强化打下了基础.
