循环水泵房进水前池水流特性和几何尺寸优化
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摘要
进水前池是泵房流道取水工程的重要组成部分,为取水流道提供良好的水流流态,使水流在前池内整流、袒化,保证循环水泵房吸水室内水流均匀,从而达到循环水泵正常运行时所需要的取水条件。循环水泵房进水前池水流的流态,对于水泵能否正常的工作,提高水泵的运行效率以及延长水泵的使用寿命具有重大的作用。
但是,在实际的工程项目当中,由于受到场地的限制,资金的限制等问题,泵站的进水前池长度往往不能按照理想的尺寸进行设计,水流在进水前池中就会出现偏流、旋涡、脱壁回流等不良的水流现象,从而对吸水室内的水流造成影响,因此,了解进水前池尺寸对水流流态的影响就显得十分重要。
本文结合某电站循环水泵房进水流道设计,按照重力相似的原则,建立了泵站进水流道的物理模型,并选取五组不同的前池长度作为一个系列进行试验研究,得出了满足水流流态条件的最佳前池长度,提出了进水前池的控制尺寸。
同时,本文建立了基于RNG k-ε模式的进水流道三维水流模型,利用已有的物理模型试验资料对所建立的数学模型进行了验证计算,得出的结果表明所建立的数学模型具有良好的模拟能力,可以进行相关的扩展研究。在此基础上进行前池扩散角优化的数值模拟研究,通过对不同扩散角下前池水流流态的计算,获得了进水前池内部三维流动特性,分析了在不同扩散角下,满足水流条件的最佳前池长度,提出了不同扩散角下前池长度的判定标准,为类似的工程项目设计提供参考依据。
The intake forebay of the pump station is an important part of circulating water system,provide a good flow pattern for the pump station? to ensure the flow uniform in the Water-obsorbing room of circulating water pump room, reach water conditions of of pump normal operation. Water flowing state of the intake forebay of the pump station is very important in water pump can work normally, improve the efficiency of the pump and extend the service life of the pump.
However,in the practical engineering projects, due to some restrictions, such as the problem of funds and the problems of the restrictions,the intake forebay of the pump station can not be designed according to the size of the ideal,the adverse flow patterns occur easily in the fore bay,such as bias current,circumfluence which gose out of wall and vortices,which can affect the flow pattern in suction chamber.So,it is very important for understand the effects of previous pool size water flow regime.
Combined with a power inlet circulating water pump design, according to the principle of gravity similar, Establish the pumping station of inlet physical model, and selection of different groups of five previous pool length, as a series of tests, Obtains the best pool length of Meet flow condition, The proposed control size of The intake forebay of the pump station.
In order to compared with the physical model experiment verification results, this paper established the3d flow model based on RNG k-ε model, use has some physical model test data to verify calculation of the established mathematical model. The results show that the established mathematical model has good simulation ability, can the expansion of the related research. Based on the progress of numerical simulation about the diffusion angle of anterior pool optimization numerical simulation, through to the flow regime calculation about different diffusion angle in the the intake forebay of the pump station, get the flow characteristics of3d in the he intake forebay of the pump station, analyzes the situations of different diffusion angle, best pool length of meet flow condition, proposed to judge the standard of pool length of different diffusion angle, provide a reference basis for similar engineering, through the experiment with the existing results, show that the calculation results are reliable.
但是,在实际的工程项目当中,由于受到场地的限制,资金的限制等问题,泵站的进水前池长度往往不能按照理想的尺寸进行设计,水流在进水前池中就会出现偏流、旋涡、脱壁回流等不良的水流现象,从而对吸水室内的水流造成影响,因此,了解进水前池尺寸对水流流态的影响就显得十分重要。
本文结合某电站循环水泵房进水流道设计,按照重力相似的原则,建立了泵站进水流道的物理模型,并选取五组不同的前池长度作为一个系列进行试验研究,得出了满足水流流态条件的最佳前池长度,提出了进水前池的控制尺寸。
同时,本文建立了基于RNG k-ε模式的进水流道三维水流模型,利用已有的物理模型试验资料对所建立的数学模型进行了验证计算,得出的结果表明所建立的数学模型具有良好的模拟能力,可以进行相关的扩展研究。在此基础上进行前池扩散角优化的数值模拟研究,通过对不同扩散角下前池水流流态的计算,获得了进水前池内部三维流动特性,分析了在不同扩散角下,满足水流条件的最佳前池长度,提出了不同扩散角下前池长度的判定标准,为类似的工程项目设计提供参考依据。
The intake forebay of the pump station is an important part of circulating water system,provide a good flow pattern for the pump station? to ensure the flow uniform in the Water-obsorbing room of circulating water pump room, reach water conditions of of pump normal operation. Water flowing state of the intake forebay of the pump station is very important in water pump can work normally, improve the efficiency of the pump and extend the service life of the pump.
However,in the practical engineering projects, due to some restrictions, such as the problem of funds and the problems of the restrictions,the intake forebay of the pump station can not be designed according to the size of the ideal,the adverse flow patterns occur easily in the fore bay,such as bias current,circumfluence which gose out of wall and vortices,which can affect the flow pattern in suction chamber.So,it is very important for understand the effects of previous pool size water flow regime.
Combined with a power inlet circulating water pump design, according to the principle of gravity similar, Establish the pumping station of inlet physical model, and selection of different groups of five previous pool length, as a series of tests, Obtains the best pool length of Meet flow condition, The proposed control size of The intake forebay of the pump station.
In order to compared with the physical model experiment verification results, this paper established the3d flow model based on RNG k-ε model, use has some physical model test data to verify calculation of the established mathematical model. The results show that the established mathematical model has good simulation ability, can the expansion of the related research. Based on the progress of numerical simulation about the diffusion angle of anterior pool optimization numerical simulation, through to the flow regime calculation about different diffusion angle in the the intake forebay of the pump station, get the flow characteristics of3d in the he intake forebay of the pump station, analyzes the situations of different diffusion angle, best pool length of meet flow condition, proposed to judge the standard of pool length of different diffusion angle, provide a reference basis for similar engineering, through the experiment with the existing results, show that the calculation results are reliable.
引文
[1]熊保锋.泵站进水流道水力模拟与研究[D].南京水利科学研究院.2009.
[2]张宇华,王艳萍,王卫红.火电厂进水流道体型优化试验研究[J].黄河水利职业技术学院学报.2006.7.
[3]武汉水利电力学院主编.水泵及水泵站[M].北京：水利电力出版社.1980.
[4]徐辉,田家山.大型污水泵站前池进水流态的研究[J].给水排水.
[5]陈韬.泵装置试验与进水流道数值模拟研究[D].河海大学.2007.3.
[6]陶文铨.数值传热学[M].西安：西安交通大学出版社.2001.
[7]赵秀风.引水遂洞洞内消能水工模型试验的研究[D].华北水利水电学院.2006.
[8]南京水利科学研究院,水利水电科学研究院.水工模型试验(第二版)[M].水力出版社.1985.
[9]#12
[10]成立.泵站水流运动特性及水力性能数值模拟研究[D].河海大学.2006.
[11]周济人,刘超,汤方平.大型泵站前池水流流态模拟.水利水电技术[J].1996.
[12]周济人,刘超,汤方平,成立.泵站复杂前池内的流态改善研究.江苏农学院学报[J].1998.
[13]周济人,刘超,汤方平,成立.泵站复杂前池内的流态改善研究.排灌机械[J].1998.[14]周济人,刘超,袁家博.改善王山泵站前池水流流态的模拟试验研究.排灌机械
[J].1995.
[15]周济人,刘超,汤方平.大型泵站前池水流流态的模拟[J].水利水电技术.1996.
[16]周济人等.王山北泵站综合技术改造技术[J].灌溉排水.1998.
[17]刘超.排灌机械[M].南京：河海大学出版社.2000.
[18]李书恒.托克托电厂循环水泵站进水流道模型试验研究[D].北京工业大学.2006.
[19]Constantinescu G S,Patel V C, A numerical model for simulation of pump-intake flow and nortices(J).ASCE Journal of Hydraulic Engineering.1998.
[20]Rajendran V P, Patel V C.Measurement of Vortices in Model Punp-intake flow anvortices.ASCE Journal of Hydraulic Engineering.2000.
[21]李小明.水泵吸水池流畅PIV分析[J].农业机械学报.2002.
[22]李大亮.开敞式进水池内部流动的3DPIV实验研究[D].扬州大学.2004.
[23]赵建钧,吴修峰.福州江阴电厂2*600MW机组新建工程循环水系统引水流道水力特性研究—引水隧道流道及循环水泵房流道物理模型试验研究报告.南京水利科学研究院水文水资源与水利工程科学国家重点实验室[J].2004.
[24]袁新明,陈华,王丽艳.低弗氏数对冲式消力池紊流水流的数值模拟[J].扬州大学学报.2004.
[25]Jose Matos Sliva,Songheng Li.Numerical simulation of flow in practical water-pump intakes,Proceedings of the XXIX AHR Congress,Beijing,CHINA,2001.
[26]Songheng Li,Lai,Y.G, Patel,V.C.ed.Water-intake pump bays:three-dimensional flow modleling,validation,and application. Proceedings of the 4th Internationl Conference on Hydro infromatics,Cedar Rapids,USA,2000.
[27]Lai,Y.G Computational method of second-moment turbulence closures in complex geornetries. AAIA JOURNAL,2000
[28]Lai,Y.G Unstructured grid Arbitrarily shaped element method for fluid flosimulation. AIAA JOURNAL,1995.
[29]Hwang,Young-Kyu;Heo,Joong-Sik;Choi,Wook-JinNumerical and experimental investigations of channel flows in a disk-type dragpump.AIP Conference Proceed ings,2001.
[30]Constantinescu S.QPatel V.G. Numerical Model For simulation of pump-intake flow and voritices.Journal of Hydraulic Engineering,1998.
[31]Sotiropoulos,F.Patel V.C.Turbulence anisotropy and near-wall modeling in predicting three-dimensional shear-flows.AAIAJ.1995.
[32]郭加洪.泵站双进水口进水池内三维湍流的数值计算[J].排灌机械.2004.
[33]陈红勋,张仁田.一种计算大型泵站进水流道内部流畅的方法[J].排灌机械.1993.
[34]陆林广.泵站进水流道设计理论的新进展.河海大学学报(自然科学版)[J].2001.
[35]周俊杰,徐国权,张华俊.FLUENT工程技术与实例分析[M].北京：中国水利水电出版社.
[36]张凯,王瑞金,王刚FLUENT技术基础与应用实例[M].清华大学出版社.2010.
[37]朱红钧,林元华,谢龙汉.FLUENT流体分析及仿真实用教程[M].北京：人民邮电出版社.2010.
[38]杨伟.大型取水泵站进水流态的数值模拟研究[D].河海大学.2008.3.
[39]Deeny D F An experimental study of air-entraining vortices at pump sumps.1956.
[40]Y R Reddy.J A Pickford Vortices at intakes in conventional sumps.1972.
[41]Akalank K.jain,Kittur GRanga Raju,Ramachandra J. Garde. Vortices Formation at Vertical pipe intake J.of Hydraulic Division,1978.
[42]周济人,刘超,汤方平.底坎在泵站前池流态改善中的应用[J].江苏农学院学报.1995.
[43]蔡付林等.双向水流侧式进出水口分流墩研究[J].河海大学学报.2000.
[44]扬州大学.郑集泵站整体模型试验研究报告[J].扬州江苏机电排灌工程研究所.1994.
[45]田家山.排涝泵站前池流态及其改善措施的研究[J].华东水利学院学报.1983.
[46]庞学诗.水力旋流器工艺计算[M].北京：中国石化出版社.1997.
[47]李海峰.自由表面旋涡的机理研究[D].上海大学.2008.
[48]Akalank K.Jain,Kittur GRanga Raju,Ramachandra J.Garde. Vortices Formation at Vertical pipe intakes. J.of Hydraulic Division,1978,104(10):1429-1445.
[49]Japan Association of Agricultaral Engineering Enterrises:Pumping station engineering handbook, Tokyo,1991;127-138.
[50]I.S.Pateron. The design ofpump intakes.Pumps,1971(55):172-176.
[51]U.S. Army Corps of Engineers.Hydraulic design guidance for rectabgular surnps of small pumping stations with vertical pumps and ponded approsches.Engrg.tech.Letter No.1110-2-313;Washington,D.C.1988.
[52]韩敬钦等.沿海电厂循环水泵流道的水利特性及优化研究.《水利水电技术》.2011.
[53]余常昭.环境流体力学导论[M].清华大学出版社.
[54]国家电力公司电力规划设计总院《火力发电厂循环水泵房进水流道及其布置设计技术规定》(试行)[M]
[2]张宇华,王艳萍,王卫红.火电厂进水流道体型优化试验研究[J].黄河水利职业技术学院学报.2006.7.
[3]武汉水利电力学院主编.水泵及水泵站[M].北京：水利电力出版社.1980.
[4]徐辉,田家山.大型污水泵站前池进水流态的研究[J].给水排水.
[5]陈韬.泵装置试验与进水流道数值模拟研究[D].河海大学.2007.3.
[6]陶文铨.数值传热学[M].西安：西安交通大学出版社.2001.
[7]赵秀风.引水遂洞洞内消能水工模型试验的研究[D].华北水利水电学院.2006.
[8]南京水利科学研究院,水利水电科学研究院.水工模型试验(第二版)[M].水力出版社.1985.
[9]#12
[10]成立.泵站水流运动特性及水力性能数值模拟研究[D].河海大学.2006.
[11]周济人,刘超,汤方平.大型泵站前池水流流态模拟.水利水电技术[J].1996.
[12]周济人,刘超,汤方平,成立.泵站复杂前池内的流态改善研究.江苏农学院学报[J].1998.
[13]周济人,刘超,汤方平,成立.泵站复杂前池内的流态改善研究.排灌机械[J].1998.[14]周济人,刘超,袁家博.改善王山泵站前池水流流态的模拟试验研究.排灌机械
[J].1995.
[15]周济人,刘超,汤方平.大型泵站前池水流流态的模拟[J].水利水电技术.1996.
[16]周济人等.王山北泵站综合技术改造技术[J].灌溉排水.1998.
[17]刘超.排灌机械[M].南京：河海大学出版社.2000.
[18]李书恒.托克托电厂循环水泵站进水流道模型试验研究[D].北京工业大学.2006.
[19]Constantinescu G S,Patel V C, A numerical model for simulation of pump-intake flow and nortices(J).ASCE Journal of Hydraulic Engineering.1998.
[20]Rajendran V P, Patel V C.Measurement of Vortices in Model Punp-intake flow anvortices.ASCE Journal of Hydraulic Engineering.2000.
[21]李小明.水泵吸水池流畅PIV分析[J].农业机械学报.2002.
[22]李大亮.开敞式进水池内部流动的3DPIV实验研究[D].扬州大学.2004.
[23]赵建钧,吴修峰.福州江阴电厂2*600MW机组新建工程循环水系统引水流道水力特性研究—引水隧道流道及循环水泵房流道物理模型试验研究报告.南京水利科学研究院水文水资源与水利工程科学国家重点实验室[J].2004.
[24]袁新明,陈华,王丽艳.低弗氏数对冲式消力池紊流水流的数值模拟[J].扬州大学学报.2004.
[25]Jose Matos Sliva,Songheng Li.Numerical simulation of flow in practical water-pump intakes,Proceedings of the XXIX AHR Congress,Beijing,CHINA,2001.
[26]Songheng Li,Lai,Y.G, Patel,V.C.ed.Water-intake pump bays:three-dimensional flow modleling,validation,and application. Proceedings of the 4th Internationl Conference on Hydro infromatics,Cedar Rapids,USA,2000.
[27]Lai,Y.G Computational method of second-moment turbulence closures in complex geornetries. AAIA JOURNAL,2000
[28]Lai,Y.G Unstructured grid Arbitrarily shaped element method for fluid flosimulation. AIAA JOURNAL,1995.
[29]Hwang,Young-Kyu;Heo,Joong-Sik;Choi,Wook-JinNumerical and experimental investigations of channel flows in a disk-type dragpump.AIP Conference Proceed ings,2001.
[30]Constantinescu S.QPatel V.G. Numerical Model For simulation of pump-intake flow and voritices.Journal of Hydraulic Engineering,1998.
[31]Sotiropoulos,F.Patel V.C.Turbulence anisotropy and near-wall modeling in predicting three-dimensional shear-flows.AAIAJ.1995.
[32]郭加洪.泵站双进水口进水池内三维湍流的数值计算[J].排灌机械.2004.
[33]陈红勋,张仁田.一种计算大型泵站进水流道内部流畅的方法[J].排灌机械.1993.
[34]陆林广.泵站进水流道设计理论的新进展.河海大学学报(自然科学版)[J].2001.
[35]周俊杰,徐国权,张华俊.FLUENT工程技术与实例分析[M].北京：中国水利水电出版社.
[36]张凯,王瑞金,王刚FLUENT技术基础与应用实例[M].清华大学出版社.2010.
[37]朱红钧,林元华,谢龙汉.FLUENT流体分析及仿真实用教程[M].北京：人民邮电出版社.2010.
[38]杨伟.大型取水泵站进水流态的数值模拟研究[D].河海大学.2008.3.
[39]Deeny D F An experimental study of air-entraining vortices at pump sumps.1956.
[40]Y R Reddy.J A Pickford Vortices at intakes in conventional sumps.1972.
[41]Akalank K.jain,Kittur GRanga Raju,Ramachandra J. Garde. Vortices Formation at Vertical pipe intake J.of Hydraulic Division,1978.
[42]周济人,刘超,汤方平.底坎在泵站前池流态改善中的应用[J].江苏农学院学报.1995.
[43]蔡付林等.双向水流侧式进出水口分流墩研究[J].河海大学学报.2000.
[44]扬州大学.郑集泵站整体模型试验研究报告[J].扬州江苏机电排灌工程研究所.1994.
[45]田家山.排涝泵站前池流态及其改善措施的研究[J].华东水利学院学报.1983.
[46]庞学诗.水力旋流器工艺计算[M].北京：中国石化出版社.1997.
[47]李海峰.自由表面旋涡的机理研究[D].上海大学.2008.
[48]Akalank K.Jain,Kittur GRanga Raju,Ramachandra J.Garde. Vortices Formation at Vertical pipe intakes. J.of Hydraulic Division,1978,104(10):1429-1445.
[49]Japan Association of Agricultaral Engineering Enterrises:Pumping station engineering handbook, Tokyo,1991;127-138.
[50]I.S.Pateron. The design ofpump intakes.Pumps,1971(55):172-176.
[51]U.S. Army Corps of Engineers.Hydraulic design guidance for rectabgular surnps of small pumping stations with vertical pumps and ponded approsches.Engrg.tech.Letter No.1110-2-313;Washington,D.C.1988.
[52]韩敬钦等.沿海电厂循环水泵流道的水利特性及优化研究.《水利水电技术》.2011.
[53]余常昭.环境流体力学导论[M].清华大学出版社.
[54]国家电力公司电力规划设计总院《火力发电厂循环水泵房进水流道及其布置设计技术规定》(试行)[M]