文章编号:1673-5196(2023)01-0055-06跌流竖井内循环气流流通的临界位置理论建模和计算魏佳芳*1,芦三强1,赵文举1,南军虎1,龙丽丽2,曾永亮1(1.兰州理工大学能源与动力工程学院,甘肃兰州730050;2.大连理工大学能源与动力学院,辽宁大连116024)摘要:在跌流竖井中设置内循环气流系统能够有效减缓下游排水管道被加压和气体聚集的状况.为了确定内循环气流系统中气体能够形成流通回路的临界位置,采用理论模型计算的方法研究了带有内循环气流系统的跌流竖井内湿管和气管的气压分布.结果表明:只有当气体循环路径在高于临界气压所对应的临界位置时,该内循环气流系统才能够发挥作用;理论计算所得湿管和气管的气压分布与模型实验所测得的数据相吻合;对于跌落高度为7.72m的跌流式竖井,临界位置的范围为0.65~0.84倍跌流高度,且流量越大临界位置越靠近竖井底部.关键词:跌流竖井;理论模型;内循环气流;气压临界值;临界位置中图分类号:TV39文献标志码:ATheoreticalmodelingandcalculationofcriticalpositionofinternalcirculationairflowinaplunging-typedropshaftWEIJia-fang1,LUSan-qiang1,ZHAOWen-ju1,NANJun-hu1LONGLi-li2,ZENGYong-liang1(1.CollegeofEnergyandPowerEngineering,LanzhouUniv.ofTech.,Lanzhou730050,China;2.CollegeofEnergyandPower,DalianUniv.ofTech.,Dalian116024,China)Abstract:Theinstallationofaninternalaircirculationflowsystemintheplunging-typedropshaftcanef-fectivelyslowdowntheairpressureandairaccumulationindownstreamdrainagepipelines.Inordertode-terminethecriticalpositionwheretheairintheinternalaircirculationflowsystemcanformacirculationloop,thetheoreticalcalculationmethodwasusedtoexplorethepressuredistributioninthewetshaftandtheairshaftintheplunging-typedropshaftwithaninternalaircirculationsystem.Theresultsshowedthatthesystemplayedaneffectiveroleonlywhentheair-circulatedroutewasabovethecriticalposition(corre-spondingtothecriticalpressure).Thecalculatedairpressuredistributionsinbothshaftsthroughthetheo-reticalcalculationmethodagreewiththemeasurementswell.Fortheplunging-typedropshaftwithadropheightofH=7.72m,thecriticalpositionwasabout0.65H~0.84H.Moreover,thecriticalpositionwasclosertothebottomofthedropshaftwiththeincreaseofthewaterflowrate.Keywords:plung...
