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时间:2020-03-28
《船用蒸汽蓄热器放汽过程动态特性数值模拟.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第lO卷第3期中国舰船研究v01.10No.32015年6月ChineseJournalofShipResearchJun.2015网络出版地址:http://www.cnki.net/kcms/detail/42.1755.TJ.20150526.0918.010.html期刊网址:www.ship-research.com引用格式:郝金玉,张晓滨,杨元龙.船用蒸汽蓄热器放汽过程动态特性数值模拟[J],中国舰船研究,2015,10(3):98—101,107.HAOJinyu,ZHANGXiaobin,YANGYuanlong.Numerica
2、lsimulationofdynamiccharacteristicsofthediseharg.ingprocessforamarinesteamaccumulator[J].ChineseJournalofShipResearch,2015,10(3):98—101,107.船用蒸汽蓄热器放汽过程动态特性数值模拟郝金玉1,张晓滨2,杨元龙21海军装备部驻沈阳地区军事代表局,辽宁沈阳1100312中国舰船研究设计中心,湖北武汉,430064摘要:船用蒸汽蓄热器是在极短时问内实现从较大流量供汽能力向极大流量供汽能力转换的关键设备,对船舶蒸汽动力系
3、统安全稳定运行具有重要影响。以船用蒸汽蓄热器为原型,建立三维物理模型,采用两流体模型计算放汽过程中的闪蒸规律,利用标准k—e方程计算蓄热器湍流脉动形式,并引入指数压降放汽边界条件,进行船用蒸汽蓄热器放汽过程动态特性的数值研究。计算结果表明:在放汽起始阶段,蒸汽蓄热器出现了“虚假水位”;放汽过程后期,在蒸汽蓄热器水空间呈现涡流现象,形成了汽水自然对流循环,加强了汽水湍流脉动及沸腾传热效果,其模拟计算结果与试验数据基本吻合。关键词:船用蒸汽蓄热器;放汽过程;动态特性;数值模拟中图分类号:U664.11文献标志码:ADOI:10.39696.issn.
4、1673—3185.2015.03.016NumericalsimulationofdynamiccharacteristicsofthedischargingprocessforamarinesteamaccumulatorHAOJinyu’,ZHANGXiaobin2,YANGYuanlon921ShenyangMilitaryRepresentativeDepartment,NavalArmamentDepartmentofPLAN,Shenyang110031,China2ChinaShipDevelopmentandDesignCent
5、er,Wuhan430064,ChinaAbstract:Themarinesteamregeneratoristhekeyequipmenttoachievemaximumflowconversion(frommediumsteamsupplycapacitytolargesteamsupplycapacity)withinaveryshorttime,whichexertssignifi·cantimpactsonthesafetyandstabilityofthesteampowersystemoperation.Inthispaper,a
6、marinesteamheataccumulatoristakenastheprototype,basedonwhichathree—dimensionalphysicalmodelisbuilt.Thetwo—fluidmodelisusedtocalculateflashdistributionusingthedischargeprocess.Turbulentfluctua·tionisalsoanalyzedbyusingthestandardequation,andtheexponentialpressuredropboundaryco
7、ndi—tionsareapplied.Anumericalstudyonthedynamiccharacteristicsofthedischargingprocessformarinesteamaccumulatoriscarriedout.Theresultsshowthatatthebeginningofthedischargingprocess,thefalsewaterlevelisgeneratedwithinthesteamaccumulator,whileattheendingofthedischargingprocess,ed
8、dycurrentsareinducedwithinthewaterspaceofthesteamaccumulator,generat
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