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工程科学与技术:2014,46(5):49-57
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基于准自由涡分布的阻塞旋流泄洪洞流场分析
(西安理工大学水利水电学院)
AnalysisofRotaryFlowinSpillwayTunnelwithBlocking BasedonQuasi-free-vortexRules
(Inst. of Water Resources and Hydroelectric Eng.,Xi’anUniv. ofTechnol.)
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投稿时间:2013-12-01    修订日期:2014-07-04
中文摘要: 为解决高坝泄洪建筑物亟待解决的高速水流问题,提出新型的阻塞旋流泄洪洞。采用试验研究和理论分析相结合的方法,对该类泄洪洞在不同阻塞体型下的流态、泄流量、壁面压强、空腔直径、旋流角和流速等水力特性进行研究,并在此基础上基于准自由涡分布理论对旋流流场进行分析。结果表明,阻塞有利于改善旋流洞内流态,增大壁面压强,可大大减小空化可能性;阻塞使旋流空腔半径减小,旋流角增大,同时阻塞处水流急剧紊动,提高了水流消能率;阻塞可减小泄流能力是其不利之处。依据水流流动的形成机理分析和试验实测流速分布特点,基于准自由涡分布规律对切向流速进行分析,得到相关参数;建立了壁面压强、旋流角、空腔直径、泄流量与切向流速分布参数等水力特性间的关系式和相对轴向流速的计算表达式,并通过试验实测数据验证了旋流准自由涡运动规律的正确性。研究成果可为阻塞旋流泄洪洞的研究与应用提供参考。
Abstract:The rotary flow spillway tunnel with blocking was proposed for meeting the requirement of energy dissipation in high dam.The hydraulic characteristics of rotary flow in tunnel with different blocking,such as flow pattern,discharge,wall pressure,cavity diameter,rotational flow angle,and velocity were studied by experimentation,and then the velocity distribution was analyzed by quasi-free-vortex hypothesis.The results showed that the possibility of cavitation would decrease with the increase of wall pressure due to the blocking, and the energy dissipation would increase significantly with the increase of rotational flow angle and intense turbulence flow in the blocking.The disadvantage was that the discharge would be decreased.By the analysis of flow mechanism and measured velocity,the tangential velocity distribution along radial direction was studied by quasi-free-vortex hypothesis.The relation among wall pressure,rotational flow angle,cavity diameter,discharge and parameters of tangential velocity distribution was established, and the axial velocity expression was built.Then the expressions were verified and characteristics of flow motion were proved by experimentation.The results could provide references for the research and application of the tunnel.
文章编号:201301500     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(50579086);陕西省重点学科建设专项基金项目(00X901)
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李奇龙,牛争鸣,王捷.基于准自由涡分布的阻塞旋流泄洪洞流场分析[J].工程科学与技术,2014,46(5):49-57.
Li Qilong,Niu Zhengming,Wang Jie.AnalysisofRotaryFlowinSpillwayTunnelwithBlocking BasedonQuasi-free-vortexRules[J].Advanced Engineering Sciences,2014,46(5):49-57.