跌坎型消能工冲击区流速衰减规律研究  

Study on the Formula of Flow Rate Decay of Impact Area in Falling-Sill Energy Dissipation

作　　者：崔召 王海军[2] 刘家伟 CUI Zhao1,WANG Haijun2 ,LIU Jiawei1(i.Kanzhongda Geotechnical Engineering Quality Testing Co.,Ltd. of Yunnan,Kunming 650024,China;2.Facu1ty of Electric Pow-er Engineering,Kunming University of Science and Technology,Kunming 650500,Chin)

机构地区：[1]云南勘中达岩土工程质量检测有限公司,云南昆明650024 [2]昆明理工大学电力工程学院,云南昆明650500

出　　处：《人民黄河》2018年第6期127-132,共6页Yellow River

基　　金：国家自然科学基金资助项目(51169008)

摘　　要：跌坎型底流消能工冲击区对消力池的消能效率具有决定性的影响,而冲击区入射主流轴线流速沿程衰减规律及机理尚不明确。采用水工模型试验方法,开展了冲击区主流轴线最大流速与跌坎深度、入池流量之间相互关系的研究,结果表明,跌坎型底流消能工冲击区入射主流轴线流速的衰减遵循一般的射流衰减规律。通过水工模型试验结果的无量纲化,给出了u_((i)max)/u_0(入射主流轴线各特征断面点流速的无量纲值)—x_i/L(入射主流轴线各特征断面点距离的无量纲值)的关系,研究结果表明:跌坎型底流消能工冲击区入射主流轴线流速衰减规律不受跌坎深度、入池流量的影响,具有相似的衰减趋势;入射主流轴线流速沿程衰减拟合曲线表明入射主流轴线流速沿程得到充分衰减。The impact area of falling sill bottom flow energy dissipation has a decisive influenceon the energy dissipation efficiency of stilling basin. However,incident mainstream axis attenuation rule and mechanism of the impact area is unclear. Based on the hydraulic model test method,the relationship between the maximum velocity of main axis in impact zone and the depth of falling sill,energy into the pool had been researched. The results show that the incident mainstream axis attenuation of impact area in falling sill bottom flow energy dissipation follows the rules of general jet attenuation. By the hydraulic model test results dimensionless,the relationship between the u_（（i）max）/u_0（ the velocity dimensionless value of the each feature section of the incident major axis） and x_i/L（ the distance dimensionless value of each characteristic section of the incident major axis） has shown. The results show that incident mainstream axis attenuation rule of impact area in falling sill bottom flow energy dissipation unaffected by the depth of falling sill and the energy into the pool have the same attenuation trend. By the impact area of incidence mainstream axis velocity distribution fitting curve,it shows that the flow velocity along the incidence mainstream axis is sufficiently attenuated.

关 键 词：跌坎型底流消能工 水工模型试验 冲击区 流速衰减规律 无量纲化 水力学指标 

分 类 号：TV135.2[水利工程—水力学及河流动力学]