雷诺数对调节阀模化试验影响的研究
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摘要
汽轮机调节阀作为火电厂控制机组通流的核心部件,直接影响机组的经济性和安全性。调节阀的通流和振动特性模化试验常用低压空气代替高温蒸汽,但在模化参数条件下试验能否再现原型参数下调节阀内的流动特性还有待验证。结合试验和数值模拟对比分析了原型和模化参数下阀内的流动特性。结果表明:在几何相似、压比相同和雷诺数进入自模化区的基础上进行模化试验,可反映原参数下调节阀的通流特性、压损和流型;但要模拟原型参数下阀内流动的动态特性和流体激励的阀杆系统响应特性,则需使模化试验的雷诺数和原型参数相等。
The steam turbine control valve, as the core component of the flow control for the thermal power plant,directly affects the economy and safety of the unit. The low pressure air is often used in the control valve's modeling experiment of flow and vibration characteristics instead of high temperature steam. However, whether the test can reproduce the flow characteristics of prototype parameters under the condition of model parameters remains to be verified. In this paper, the flow characteristics in the valve under prototype parameters and modeling parameters were analyzed based on the experiments and numerical simulations. The results show that the modeling experiment can report the flow characteristics,pressure loss and flow patterns in control valve of prototype parameters based on geometrical similarity, the same pressure ratio and Reynolds number of entering self-modeling area.However, to simulate the dynamic characteristics of flow and the response characteristics of the valve stem system for the modeling experiment, the Reynolds number of the modeling experiment should be the same with the prototype parameters.
The steam turbine control valve, as the core component of the flow control for the thermal power plant,directly affects the economy and safety of the unit. The low pressure air is often used in the control valve's modeling experiment of flow and vibration characteristics instead of high temperature steam. However, whether the test can reproduce the flow characteristics of prototype parameters under the condition of model parameters remains to be verified. In this paper, the flow characteristics in the valve under prototype parameters and modeling parameters were analyzed based on the experiments and numerical simulations. The results show that the modeling experiment can report the flow characteristics,pressure loss and flow patterns in control valve of prototype parameters based on geometrical similarity, the same pressure ratio and Reynolds number of entering self-modeling area.However, to simulate the dynamic characteristics of flow and the response characteristics of the valve stem system for the modeling experiment, the Reynolds number of the modeling experiment should be the same with the prototype parameters.
引文
[1]于达仁,项庆华,隋岩峰.汽轮机调节系统阀杆卡涩故障在线检测方法[J].中国电机工程学报,2001,21(12):59-62.Yu Daren,Xiang Qinghua,Sui Yanfeng.On-line detection method for jam faults of the servo valve piston in the steam turbine governing system[J].Proceedings of the CSEE,2001,21(12):59-62(in Chinese).
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[13]Araki T,Okamoto Y,Ootomo F.Fluid induced vibration of steam control valves[J].Toshiba Review,1981,36(7):372-462.
[14]曾立飞,刘观伟,毛靖儒,等.调节阀振动对阀内流场影响的数值模拟[J].中国电机工程学报,2015,35(8):1977-1982.Zeng Lifei,Liu Guanwei,Mao Jingru,et al.Numerical simulation for the effect of the control valve vibration on the flow field[J].Proceedings of the CSEE,2015,35(8):1977-1982(in Chinese).
[15]Zeng Lifei,Liu Guanwei,Mao Jingru,et al.Flow-induced vibration and noise in control valve[J].Proceedings of the Institution of Mechanical Engineers,Part C:Journal of Mechanical Engineering Science,2015,229(18):3368-3377.
[16]Spalart P R,Jou W H,Strelets M,et al.Comments on the feasibility of LES for wings and on a hybrid RANS/LESapproach[C]//Proceedings of 1st AFOSR International Conference On DNS/LES.Columbus:Greyden Press,1997:4-8.
[17]聂欣,张玉洲,张童伟,等.6种低雷诺数k-?模型在三维附壁剪切流中的数值模拟与对比分析[J].中国电机工程学报,2017,37(24):7247-7254.Nie Xin,Zhang Yuzhou,Zhang Tongwei,et al.Comparative analysis and numerical simulation about six low Reynolds number k-?models in near-wall shear flow[J].Proceedings of the CSEE,2017,37(24):7247-7254(in Chinese).
[2]朱珍锦,张长鲁.切圆锅炉炉内冷态模化理论研究[J].中国电机工程学报,2001,21(5):47-50.Zhu Zhenjin,Zhang Changlu.Studies on cold modeling theory of furnace in tangential firing system[J].Proceedings of the CSEE,2001,21(5):47-50(in Chinese).
[3]屠珊,孙弼,毛靖儒.电站汽轮机调节阀振动试验研究[J].阀门,2003(5):7-10.Tu Shan,Sun Bi,Mao Jingru.Experimental study on vibration induced by fluid flow in steam turbine control valve[J].Valve,2003(5):7-10(in Chinese).
[4]相晓伟.汽轮机调节阀通流及稳定性的实验和数值研究[D].西安:西安交通大学,2007.Xiang Xiaowei.Experimental and numerical investigations on flowrate and instability induced by airflow in steam-turbine control valve[D].Xi’an:Xi’an Jiaotong University,2007(in Chinese).
[5]刘观伟.汽轮机调节阀流动与气动噪声的形成机理及控制和预测方法[D].西安:西安交通大学,2015.Liu Guanwei.Generation mechanism,control method and prediction of flow characteristics and aerodynamic noise in steam turbine control valve[D].Xi’an:Xi’an Jiaotong University,2015(in Chinese).
[6]Morita R,Inada F,Mori M,et al.CFD simulations and experiments of flow fluctuations around a steam control valve[J].Journal of Fluids Engineering,2007,129(1):48-54.
[7]Morita R,Inada F.Pressure fluctuations around steam control valve:steam experiments and cfd calculations[C]//Proceedings of ASME 2007 Pressure Vessels and Piping Conference.San Antonio,Texas,US:American Society of Mechanical Engineers,2007:421-427.
[8]Yonezawa K,Ogawa R,Ogi K,et al.Flow-induced vibration of a steam control valve[J].Journal of Fluids and Structures,2012,35:76-88.
[9]徐克鹏,蔡虎,崔永强,等.大型汽轮机主汽调节阀的实验与数值分析[J].动力工程,2003,23(6):2785-2789,2794.Xu Kepeng,Cai Hu,Cui Yongqiang,et al.Experimental and numerical investigation into high-pressure-combined valve for large steam turbines[J].Power Engineering,2003,23(6):2785-2789,2794(in Chinese).
[10]毛靖儒,屠珊,孙弼,等.汽轮机调节阀内流动特性的试验研究[J].工程热物理学报,2002,23(6):687-690.Mao Jingru,Tu Shan,Sun Bi,et al.The experimental study of flow characteristics within control valve for steam turbine[J].Journal of Engineering Thermophysics,2002,23(6):687-690(in Chinese).
[11]Zhang D,Engeda A,Hardin J R,et al.Experimental study of steam turbine control valves[J].Proceedings of the Institution of Mechanical Engineers,Part C:Journal of Mechanical Engineering Science,2004,218(5):493-507.
[12]Morita R,Inada F,Mori M,et al.A study of flow oscillation on the steam control valve[J].Transactions of the Japan Society of Mechanical Engineers,2003,70(3):1978-1983.
[13]Araki T,Okamoto Y,Ootomo F.Fluid induced vibration of steam control valves[J].Toshiba Review,1981,36(7):372-462.
[14]曾立飞,刘观伟,毛靖儒,等.调节阀振动对阀内流场影响的数值模拟[J].中国电机工程学报,2015,35(8):1977-1982.Zeng Lifei,Liu Guanwei,Mao Jingru,et al.Numerical simulation for the effect of the control valve vibration on the flow field[J].Proceedings of the CSEE,2015,35(8):1977-1982(in Chinese).
[15]Zeng Lifei,Liu Guanwei,Mao Jingru,et al.Flow-induced vibration and noise in control valve[J].Proceedings of the Institution of Mechanical Engineers,Part C:Journal of Mechanical Engineering Science,2015,229(18):3368-3377.
[16]Spalart P R,Jou W H,Strelets M,et al.Comments on the feasibility of LES for wings and on a hybrid RANS/LESapproach[C]//Proceedings of 1st AFOSR International Conference On DNS/LES.Columbus:Greyden Press,1997:4-8.
[17]聂欣,张玉洲,张童伟,等.6种低雷诺数k-?模型在三维附壁剪切流中的数值模拟与对比分析[J].中国电机工程学报,2017,37(24):7247-7254.Nie Xin,Zhang Yuzhou,Zhang Tongwei,et al.Comparative analysis and numerical simulation about six low Reynolds number k-?models in near-wall shear flow[J].Proceedings of the CSEE,2017,37(24):7247-7254(in Chinese).