摘要
多喷孔淹没式套筒阀是一种用于压力管道的新型消能型式,它是利用多股多层喷孔使水流高速喷出后在消力池内卷吸、掺混,形成强烈紊动水流来消减能量。喷孔的大小、数量以及布置方式决定了该消能工的消能效率。本文采用RNGk-ε紊流模型对管道出口多喷孔射流消能进行了三维数值模拟研究,对喷孔的优化布置方式进行初步的探索,对该消能工的消能机理以及其它水力特性也进行了分析讨论。提出了断面余能比概念,并以此通过分析比较不同喷孔个数以及喷孔布置方式下的消能效果,发现喷孔交错梅花状布置的消能效果明显优于平行排列的布置方式,给出了断面比能与喷孔个数的变化曲线。
The submerged discharge sleeve valve with multiple pressure pipe, by which fluid energy can be dissipated through jets is served as a new type of energy dissipater for entrainment and mixing of the high speed flow shot out from the multiple jets at multilevel into the plunge pool, in which strong turbulent flow can be produced. Energy dissipation ratio depends on the sizes, quantity and layout of the nozzles. In this paper, RNG k-ε model is applied to simulate the 3-D flow field on energy dissipation of multiple jets for pipe outlet. The optimum layout of nozzles on the sleeve valve has been presented, and flow structure and mechanism of energy dissipation have been also revealed. The concept of remained energy ratio is pointed out, by which the energy dissipation ratios among many cases are compared, and it can be found that the energy dissipation effect in the staggered arrangement of holes is better than in the parallel arrangement, and the relation curve is obtained from the remained energy ratio and the numbers of nozzles.
出处
《水力发电学报》
EI
CSCD
北大核心
2007年第1期61-66,共6页
Journal of Hydroelectric Engineering
基金
山西省科学技术厅科技攻关项目(041086)
关键词
水力学
紊流数值模拟
三维流场
多喷孔射流
消能
压力管道
hydraulics
numerical simulation of turbulent flow
3-D flow field
multiple jets
energy dissipation
pressure pipe
