基于二次回归正交试验的汽轮机排汽缸加装导流板的研究
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摘要
以某600 MW汽轮机为研究对象,应用计算流体力学软件CFX对低压缸末级和排汽缸的耦合模型进行了数值模拟,基于二次回归正交试验,在排汽缸上端安装导流板来削弱通道涡对排汽缸气动性能的影响,得到了导流板安装参数与静压恢复系数之间的回归方程。方程呈现非线性关系,显著不失拟,且三因素之间互不影响。求解回归方程的最优解,得出最佳的导流板安装方案。安装导流板后,通道涡被破碎,排汽缸的气动性能得到了明显的改善。排汽缸出口的静压恢复系数提高3.008%,总压损失系数降低5.789%,出口截面标准偏差降低了3.043。并且,不同负荷下优化后排汽缸出口的静压恢复系数均大于优化前。
A combined numerical simulation is conducted to couple fluid flow between exhaust hood and last-stage blades of a 600 MW steam turbine using the computational fluid dynamics software CFX. Based on quadratic orthogonal regression design, the flow guide device at the top of the exhaust hood is installed. The regression orthogonal equation between the installation parameters of the guide plate and the coefficient of static pressure recovery is obtained. The equation is remarkably unlost with nonlinear relation and there is no influence among the three factors. The optimal solution of the regression equation is solved. The channel vortex is broken and the aerodynamic performance of the exhaust hood is improved obviously after the diversion plate is installed. The static pressure recovery coefficient of exhaust hood outlet is increased by 3.008%, the total pressure loss coefficient is reduced by 5.789% and the standard deviation of the outlet is reduced by 3.043. The static pressure recovery coefficient of exhaust hood outlet under different loads after the optimization is always higher than that before the optimization.
A combined numerical simulation is conducted to couple fluid flow between exhaust hood and last-stage blades of a 600 MW steam turbine using the computational fluid dynamics software CFX. Based on quadratic orthogonal regression design, the flow guide device at the top of the exhaust hood is installed. The regression orthogonal equation between the installation parameters of the guide plate and the coefficient of static pressure recovery is obtained. The equation is remarkably unlost with nonlinear relation and there is no influence among the three factors. The optimal solution of the regression equation is solved. The channel vortex is broken and the aerodynamic performance of the exhaust hood is improved obviously after the diversion plate is installed. The static pressure recovery coefficient of exhaust hood outlet is increased by 3.008%, the total pressure loss coefficient is reduced by 5.789% and the standard deviation of the outlet is reduced by 3.043. The static pressure recovery coefficient of exhaust hood outlet under different loads after the optimization is always higher than that before the optimization.
引文
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[11]张勃,吉洪湖,杜发青,等.基于正交法的直通篦齿封严齿形几何参数对换热特性影响的试验研究[J].机械工程学报,2013,49(4):134-139.
[12]邓聪颖,殷国富,方辉,等.基于正交试验的机床结合部动刚度优化配置[J].机械工程学报,2015,51(19):146-153.
[2]刘晖明.300 MW机组汽轮机排汽通道安装导流装置设计研究[J].电力科学与工程,2012,28(3):75-78.
[3]谢伟亮,王红涛,竺晓程,等.汽轮机低压排汽缸内导流挡板对其性能影响的分析[J].动力工程学报,2011,31(5):347-351.
[4]魏春枝,杨新健,陈顺宝.排汽缸内置挡板对扩压管出口下游漩涡的影响[J].汽轮机技术,2014,56(3):203-205.
[5]付文锋,杨新建,周兰欣,等.某600 MW汽轮机低压末级排汽通道耦合流动三维数值模拟及其结构优化[J].中国电机工程学报,2014,34(14):2267-2273.
[6]陈川,付经伦,刘建军.汽轮机排汽通道优化设计与性能分析[J].工程热物理学报,2009,30(8):1295-1298.
[7]YoonS, StanislausF, MokulysT, etal. A three-dimensionaldiffuserdesignfortheretrofitofa lowpressureturbineusingin-houseexhaustdesign system[C]//ASMEofTurbomachinery.Vancouver,Canada,2011.
[8]Musch C,Stuer H,Hermle G.Optimization strategy for acoupleddesignofthelaststageandthesuccessive diffuserinalowpressuresteamturbine[C]//ASMEof Turbomachinery,Vancouver,Canada,2013.
[9]任露泉.试验优化设计[M].北京:机械工业出版社,1987:1-4.
[10]曹丽华,林阿强,张岩,等.基于二次回归正交试验的排汽缸导流环优化设计[J].机械工程学报,2016,52(14):157-164.
[11]张勃,吉洪湖,杜发青,等.基于正交法的直通篦齿封严齿形几何参数对换热特性影响的试验研究[J].机械工程学报,2013,49(4):134-139.
[12]邓聪颖,殷国富,方辉,等.基于正交试验的机床结合部动刚度优化配置[J].机械工程学报,2015,51(19):146-153.