On the basis of theoretical analysis and cold model test, the material motion locus and the particle size which can be separated in the swirl shaft preheater was stud-ied. A new calculation method for separation effic...On the basis of theoretical analysis and cold model test, the material motion locus and the particle size which can be separated in the swirl shaft preheater was stud-ied. A new calculation method for separation efficiency based on the meterial size distribution curve of charge and dis-charge stock from the shaft is discussed in this paper. The ex-perimental results show the material separation is due to in-teraction of both the centrifugation and the gravity. When the inlet gas velocity is a constant, the separation efficiency will be raised as the load of batch feeding inreases. If the load of batch feeding is a constant, the separation efficiency will be decreased together with the elevation of the inlet gas. The loss of shaft resistence is increased when the separation effi-ciency is raised. In our experiment the suitable separation ef-ficiency of the shaft is about 70 percent.展开更多
旋流环形堰竖井泄洪洞是一种新型的环境友好的内消能工,跟传统环形堰竖井泄洪洞相比,泄洪洞的流态和消能防蚀机理明显不同。作为一种新型布置形式,其复杂的水流特性并不是十分清楚。依托于广东清远抽水蓄能电站下水库泄洪洞工程,基于RNG...旋流环形堰竖井泄洪洞是一种新型的环境友好的内消能工,跟传统环形堰竖井泄洪洞相比,泄洪洞的流态和消能防蚀机理明显不同。作为一种新型布置形式,其复杂的水流特性并不是十分清楚。依托于广东清远抽水蓄能电站下水库泄洪洞工程,基于RNG k-ε双方程湍流数学模型,并结合VOF(Volume Of Fluid)方法,对下库旋流环形堰竖井泄洪洞进水口、竖井旋流泄洪洞、出口的复杂水流进行了三维数值模拟,并对部分水力参数的特性进行了解析计算,获得了流态、压力、流速、空化数等水力要素的变化规律。模拟结果表明,数值计算结果与物理模型试验成果吻合较好。并通过数值模拟验证了该新型内消能工的泄流能力和高消能效率。展开更多
采用气液两相流混合模型,选取标准k-ε紊流模型封闭时均方程组,利用VOF(Volume of fluid)法捕捉自由水面,速度与压力耦合方程组求解时使用半隐式SIMPLE(Semi-Implicit Method for Pressure-Linked Equations)算法,对某水电站竖井旋流放...采用气液两相流混合模型,选取标准k-ε紊流模型封闭时均方程组,利用VOF(Volume of fluid)法捕捉自由水面,速度与压力耦合方程组求解时使用半隐式SIMPLE(Semi-Implicit Method for Pressure-Linked Equations)算法,对某水电站竖井旋流放水洞的水力特性进行数值模拟研究,得到流态、流速、压力等水力要素的分布规律以及总消能率。数值模拟结果与模型试验成果进行对比,两者符合较好,进一步验证了模型试验推荐体型的合理性,同时为下一步体型设计提出建议,对工程应用提供参考依据,并具有实际意义。展开更多
文摘On the basis of theoretical analysis and cold model test, the material motion locus and the particle size which can be separated in the swirl shaft preheater was stud-ied. A new calculation method for separation efficiency based on the meterial size distribution curve of charge and dis-charge stock from the shaft is discussed in this paper. The ex-perimental results show the material separation is due to in-teraction of both the centrifugation and the gravity. When the inlet gas velocity is a constant, the separation efficiency will be raised as the load of batch feeding inreases. If the load of batch feeding is a constant, the separation efficiency will be decreased together with the elevation of the inlet gas. The loss of shaft resistence is increased when the separation effi-ciency is raised. In our experiment the suitable separation ef-ficiency of the shaft is about 70 percent.
文摘旋流环形堰竖井泄洪洞是一种新型的环境友好的内消能工,跟传统环形堰竖井泄洪洞相比,泄洪洞的流态和消能防蚀机理明显不同。作为一种新型布置形式,其复杂的水流特性并不是十分清楚。依托于广东清远抽水蓄能电站下水库泄洪洞工程,基于RNG k-ε双方程湍流数学模型,并结合VOF(Volume Of Fluid)方法,对下库旋流环形堰竖井泄洪洞进水口、竖井旋流泄洪洞、出口的复杂水流进行了三维数值模拟,并对部分水力参数的特性进行了解析计算,获得了流态、压力、流速、空化数等水力要素的变化规律。模拟结果表明,数值计算结果与物理模型试验成果吻合较好。并通过数值模拟验证了该新型内消能工的泄流能力和高消能效率。
文摘采用气液两相流混合模型,选取标准k-ε紊流模型封闭时均方程组,利用VOF(Volume of fluid)法捕捉自由水面,速度与压力耦合方程组求解时使用半隐式SIMPLE(Semi-Implicit Method for Pressure-Linked Equations)算法,对某水电站竖井旋流放水洞的水力特性进行数值模拟研究,得到流态、流速、压力等水力要素的分布规律以及总消能率。数值模拟结果与模型试验成果进行对比,两者符合较好,进一步验证了模型试验推荐体型的合理性,同时为下一步体型设计提出建议,对工程应用提供参考依据,并具有实际意义。
