2023年4月收稿日期:2022—11—20作者简介:孙海瑞(1988—),男,工程师,主要从事水利工程设计工作。摘要:为研究大河沿水库溢洪道增设前置掺气坎下设计方案对溢洪道沿程断面水力参数及消力池渗流场影响,采用水力模型试验方法,分析了不同坎阶高度方案下溢洪道沿程空腔、压强特征与池内流速变化。研究表明,坎阶高度与空腔分布长度具有正相关,但过大的坎阶高度不利于空腔稳定。以坎阶高度1.2m为界,时均压强分别具有“先增后减”与“先增后减再二次递增”的特征,坎阶高度1.4~1.6m时沿程下游出流段时均压强的递增易导致入池势能过大。坎阶高度与池内流速为负相关,但坎阶高度超过1.2m后,池内具有流速二次递增段,峰值流速靠近出池口,消能降冲效果较弱。综合试验结果,认为坎阶高度设计1.2m更为有利。本研究可为水库溢洪道掺气坎结构设计优化及模型试验分析提供参考。关键词:大河沿水库;溢洪道;模型试验;掺气坎中图分类号:TV651.1;TV131.61文献标识码:A文章编号:1004-7328(2023)04-0086-04DOI:10.3969/j.issn.1004-7328.2023.04.023大河沿水库溢洪道增设掺气坎模型试验研究孙海瑞(新疆云沣水利设计咨询有限公司,新疆乌鲁木齐830002)ModelTestStudyonAddingAerationBuckettotheSpillwayofDaheyanReservoirSUNHai-rui(XinjiangYunfengWaterConservancyDesignConsultingCo.,Ltd.,Urumqi830002,China)Abstract:InordertostudytheinfluenceofthedesignschemeofaddingfrontaeratortothespillwayofDaheyanReservoironthehydraulicparametersalongthespillwaysectionandtheseepagefieldofthestillingpool,thehydraulicmodeltestmethodwasusedtoanalyzecavity,pressurecharacteristicsandpoolflowvelocitychangesalongthespillwayundertheschemesofdifferentbucketstepheights.Theresearchshowsthatthereisapositivecorrelationbetweenridgeheightandcavitydistributionlength,buttoolargeridgeheightisnotconducivetocavitystability.Takingthebucketstepheight1.2mastheboundary,thetimeaveragepressurehasthecharacteristicsof"firstincreaseandthendecrease"and"firstincreaseandthendecreaseandthenincreaseagain"respectively.Whenthebucketstepheightis1.4~1.6m,theincreaseofthetimeaveragepressurealongthedownstreamoutflowsectionislikelytoleadtoexcessivepotentialenergyintothepool.Theheightofthebucketstepi...