基于二次回归正交试验的排汽缸导流环优化设计.pdf

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1、第52卷第14期机械工程学报Vol.52No.142016年7月JOURNALOFMECHANICALENGINEERINGJul.2016DOI：10.3901/JME.2016.14.157*基于二次回归正交试验的排汽缸导流环优化设计11231曹丽华林阿强张岩林文斌李勇(1.东北电力大学能源与动力工程学院吉林132012；2.华能九台电厂长春130501；3.福建中试所电力调整试验有限责任公司福州350007）摘要：针对某600MW机组排汽缸导流环形状对汽轮机排汽气动性能的影响，基于二次回归正交试验方法，安排不同形状导

2、流环时排汽通道气动性能的数值计算，通过显著不失拟的回归方程确定目标函数最优解，对低压排汽缸导流环型线参数进行优化设计。结果表明：导流环型线参数与排汽缸静压恢复系数呈明显的非线性关系。导流环轴向通流空间和型线曲率对排汽3缸静压恢复作用呈现相反的变化趋势，当同时满足通流空间大于320m及曲率小于0.6时，静压恢复能力趋于正交试验范围内的最佳值。优化后排汽缸的气动性能得到明显改善，出口流场均匀性得到很大的提高。排汽缸总压损失系数降低了6.85%，静压恢复系数增加了11.35%，排汽通道均匀性系数增大了6.79%。研究结果可为排汽

3、缸导流环优化设计提供一定的参考。关键词：汽轮机；排汽缸；导流环；二次回归正交试验；静压恢复系数中图分类号：TK264OptimalDesignofFlowGuideinExhaustHoodBasedonQuadraticRegressionOrthogonalMethodology11231CAOLihuaLINAqiangZHANGYanLINWenbinLIYong(1.SchoolofEnergyandPowerEngineering,NortheastDianliUniversity,Jilin132012;2.

4、HuanengJiutaiPowerPlant,Changchun130501;3.ElectricPowerAdjustmentExperimentalLiabilityCo.,FujianPilot-scaleTestResearch,Fuzhou350007)Abstract：Astheaerodynamicperformanceofexhausthoodina600MWsteamturbineisinfluencedbythestructureofflowguide,thenumericalcalculationo

5、ftheaerodynamicperformanceinexhaustpassageunderdifferentstructureofflowguideisarrangedbythemethodofquadraticregressiveorthogonalexperiment.Theprofileparametersofflowguideareoptimizedbyregressionequationwhichissignificantandfittingtodeterminetheoptimalsolutionofobj

6、ectivefunction.Theresultshowsthattheprofileparametersofflowguidehaveanobviousnonlinearrelationshipwiththestaticpressurerecoverycoefficientofexhausthood.Theimpactoftheaxialflowspaceandprofilecurvatureofflowguideonthestaticpressurerecoveryofexhausthoodappearstheoppo

7、sitechange3tendency.Whentheflowspaceisgreaterthan320mandthecurvatureislessthan0.6,thestaticpressurerecoverytendstobethebestvaluewithinthescopeoforthogonalexperiment.Aftertheoptimization，theaerodynamicperformanceofexhausthoodandtheuniformityofoutletflowfieldissigni

8、ficantlyimproved，whichthetotalpressurelosscoefficientdecreasesby6.85%，thestaticpressurerecoverycoefficientincreasesby11.35%,andtheuniformitycoefficiento