冷却塔用水轮机轴向出水蜗壳的设计与CFD分析
|
摘要
针对一种桨栅呈辐状式分布的冷却塔用新型水轮机,设计出一种适用于该水轮机的特型蜗壳,该蜗壳在结构上首次采用由圆形截面向椭圆截面过渡的轴向出水方式,这种设计不仅能有效节省冷却塔内部空间,同时也具备良好的引水性能。蜗壳设计采用了理论分析和CFD数值模拟计算相结合的方法,根据蜗壳纵向断面压力和速度分布图得出其断面处的压力和速度分布规律;结合蜗壳出口处速度矢量图,分析出口环面上标称圆圆周速度、随机点轴向速度和圆周分速度矩的分布特点。结果表明,该蜗壳的水力性能与理论设计相符,具有很高的实用价值。
Aiming at a new type of hydraulic turbine of cooling towers which paddle bars are distributed in a radial pattern,this paper designs a special volute for the turbine. The volute applies the axial drainage outlet transitioning from circular section to elliptical section for the first time,which can not only save the interior space of the cooling tower effectively but also have good performances of the diversion. In this paper,theoretical analysis and CFD numerical simulation are used to design the volute,obtaining the distribution law of the pressure and velocity at the section according to the pressure and velocity distribution diagram of the longitudinal section of the volute. Based on the velocity vector diagram at the volute outlet the distribution characteristics of the nominal peripheral speed,axial velocity of random points and circumferential component of velocity moment on the torus of outlet are analyze. The results show that the hydraulic performance of the volute is consistent with the theoretical design and it has high practical value.
Aiming at a new type of hydraulic turbine of cooling towers which paddle bars are distributed in a radial pattern,this paper designs a special volute for the turbine. The volute applies the axial drainage outlet transitioning from circular section to elliptical section for the first time,which can not only save the interior space of the cooling tower effectively but also have good performances of the diversion. In this paper,theoretical analysis and CFD numerical simulation are used to design the volute,obtaining the distribution law of the pressure and velocity at the section according to the pressure and velocity distribution diagram of the longitudinal section of the volute. Based on the velocity vector diagram at the volute outlet the distribution characteristics of the nominal peripheral speed,axial velocity of random points and circumferential component of velocity moment on the torus of outlet are analyze. The results show that the hydraulic performance of the volute is consistent with the theoretical design and it has high practical value.
引文
[1]费全昌.我国冷却塔应用现状及面临的挑战[J].电力勘测设计,2014(2):29-33.
[2]刘佳佳,屈波,章志平,等.集中式循环冷却水系统能量分析[J].水电能源科学,2017,35(9):161-164.
[3]孟凤鸣.冷却塔影响评价技术分析[J].环境科学与管理,2008(11):182-186.
[4]谭月普.冷却塔技术研究的发展及现状[J].制冷与空调(四川),2013,27(5):494-498.
[5]张利平.多冷却塔循环冷却水系统的优化设计[D].山东青岛:青岛科技大学,2014.
[6] Haijiao Cui,Nianping Li,Xinlei Wang,et al. Optimization of reversibly used cooling tower with downward spraying[J]. Energy,2017,127:30-43.
[7]周波,王志成,周长西.水力通风冷却塔的发展与应用现状[J].工业用水与废水,2010,41(3):73-75.
[8] Mariano Martín,Mónica Martín. Cooling limitations in power plants:Optimal multiperiod design of natural draft cooling towers[J]. Energy,2017,135(C):625-636.
[9]朱飞,郑源,范小娟,等.冷却塔内小型混流式水轮机的设计及数值模拟[J].水电能源科学,2013,31(7):165-168.
[10]郑源,张丽敏,尹义武,等.冷却塔中新型混流式水轮机设计[J].排灌机械工程学报,2010,28(6):484-487.
[11]屈波,丁惠华,屈晶钰,等.直驱于大型水冷塔风机的超低比转速涡轮机:CN104265546A[P]. 2015-01-07.
[12]王旭,李萍.不同湍流模型下水轮机蜗壳CFD仿真精度的分析[J].中国农村水利水电,2015(6):158-161,165.
[13]王飞,王庆方,王勇军,等.水轮机蜗壳的优化设计与CFD分析[J].水利水电科技进展,2012,32(5):86-88,94.
[14]张双全,袁晓辉.大型水轮机蜗壳的CFD分析[J].水电能源科学,2004(1):75-77.
[2]刘佳佳,屈波,章志平,等.集中式循环冷却水系统能量分析[J].水电能源科学,2017,35(9):161-164.
[3]孟凤鸣.冷却塔影响评价技术分析[J].环境科学与管理,2008(11):182-186.
[4]谭月普.冷却塔技术研究的发展及现状[J].制冷与空调(四川),2013,27(5):494-498.
[5]张利平.多冷却塔循环冷却水系统的优化设计[D].山东青岛:青岛科技大学,2014.
[6] Haijiao Cui,Nianping Li,Xinlei Wang,et al. Optimization of reversibly used cooling tower with downward spraying[J]. Energy,2017,127:30-43.
[7]周波,王志成,周长西.水力通风冷却塔的发展与应用现状[J].工业用水与废水,2010,41(3):73-75.
[8] Mariano Martín,Mónica Martín. Cooling limitations in power plants:Optimal multiperiod design of natural draft cooling towers[J]. Energy,2017,135(C):625-636.
[9]朱飞,郑源,范小娟,等.冷却塔内小型混流式水轮机的设计及数值模拟[J].水电能源科学,2013,31(7):165-168.
[10]郑源,张丽敏,尹义武,等.冷却塔中新型混流式水轮机设计[J].排灌机械工程学报,2010,28(6):484-487.
[11]屈波,丁惠华,屈晶钰,等.直驱于大型水冷塔风机的超低比转速涡轮机:CN104265546A[P]. 2015-01-07.
[12]王旭,李萍.不同湍流模型下水轮机蜗壳CFD仿真精度的分析[J].中国农村水利水电,2015(6):158-161,165.
[13]王飞,王庆方,王勇军,等.水轮机蜗壳的优化设计与CFD分析[J].水利水电科技进展,2012,32(5):86-88,94.
[14]张双全,袁晓辉.大型水轮机蜗壳的CFD分析[J].水电能源科学,2004(1):75-77.