地铁隧道毕业设计外文翻译--释压通风井影响下的活塞效应通风研究

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1、 PDF外文：http:/ 中文 5018 字  出处： Applied Thermal Engineering, 2008, 28(5): 372-379 【原文】    Astudyonundergroundtunnelventilationforpistoneffectsinfluencedbydraughtreliefshaftinsubwaysystem  Chi-JiLin,YewKhoyChuah,Chia-WeiLiu    Abstract    Thisisastudyonunderground

2、tunnelventilationforpistoneffectsinfluencedbydraughtreliefshaft.FieldmeasurementsoftransientairmovementinthedraughtreliefshaftforatypicalTaipeiundergroundsubwaystationweretakenunderwinterandsummerconditions.Ithasbeenfoundthattheairinthedraughtreliefshafthasamaximumof2m/s,andonaverageliesbetween0.7an

3、d1.1m/s.ThisstudydefinesanindexPE,for evaluatingtheefficiencyoftunnelventilationbypistoneffects.Thisindexcanbeusedto  analyzethepistoneffectsduetodifferentshaftlengthandsectionalarea.Themeasurementresultsshowthatthetrainpistoneffectsareeffectiveonlyforcertainshaftlengthandoperatingconditions. T

4、hisstudyalsousedtheauthoritativeSEScomputerprogramtosimulatethepistoneffects.Thesimulationresultsforinflowandoutflowvelocityprofilearealmostconsistentwiththemeasurement.Theshaftsectionalareawasalsoinvestigatedandhasbeenfoundthatalargersectionalarearesultedinlargervolumeflowrate,butthepercentageincre

5、aseislessthanthepercentageincreaseinthesectionalarea.Thiswillresultinsmallerair velocityinshaftandlesseffectiveairexchangebetweenthetunnelandtheoutsideambient.Italsohasbeenfoundthatlengthofthedraughtreliefshaftismoresoanimportantdesignparameterforefficientairexchangebypistoneffectsforundergroundsubw

6、aysystems.It issuggestedherethatthedesignofthedraughtreliefshafthastoconsiderrequirementsincludingPE,pressurelossandnoise.   Keywords:Draughtreliefshaft；Pistoneffect；Undergroundsubwaystation；Tunnelventilation    1. Introduction   Intypicalsubwayenvironmentaldesignhandbooks,onecan

7、findequationsforcalculatingairvelocityandpressuredistributionforventilationshafts.However,theimportanceoftunnelventilationhasdrawnmanyrecentstudiesinenvironmentalcontrolforundergroundsubwaysystems.Popeetal.analyzedsomeinfluencingfactorsfordraughtreliefandairtemperatureinanundergroundmetrosystem.Itwa

8、sshownthatthedraughtreliefshaftswithacrosssectionalareaof20m2couldresultinacceptableairflows.Keetal.usedSES(subwayenvironmentalsimulationprogram)andCFDmethodstosimulatetheenvironmentalcontrolsystemforasubwaystationdesign.Itwasfoundthatthepistoneffectswereaffectedbythecrosssectionalareaandthelengthof

9、theshaft.MaidmentandMissendeninvestigatedthefeasibilityofusingundergroundwatercoolingsystemforsubwaystation.Thestudyshowedintheorythatthesystemcouldreducethetunnelairtemperaturebyapproximately6C.Ampofoetal.reviewedthethermalcomfortablefactorsforLondonundergroundrailwayenvironment.Acceptablethermalco

10、mfortcriteriaweredescribed.Ampofoetal.theninvestigatedtheheatloadusinganundergroundrailwaynetworkconcept,andproposedsomecoolingmethodstoreducethetunnelairtemperature.ARUPinvestigatedthedesignofamodernsubwayventilationsystemandfoundthattheventilationcapacityrequiredwasdeterminedtypicallybythefireemer

11、gencymode.HongandKimanalyzedenergyconservationforKoreansubwaystationsandfoundthatenergyconsumptionwasrelatedtothenumberofpassengersandtheoperationsofthefacilities.KimandKimanalyzedthetrain-inducedunsteady3-Dairflowbynumericalsimulation  andalsoexperimentalmethods.Theyfoundabout13.7%15.9%differe

12、ncebetweencomputationandmeasurementforairvelocity.YuanandYouusedCFDsimulationtoevaluateandoptimizethevelocityandtemperaturedistributionforside-platformsubwaystation.Thebreadthwaysventilationwellpreventsthehotairspreadingontotheplatform. Subwayenvironmentaldesignhandbookdictatesthattheairvelocityfort

13、unnelventilationsystembedeterminedwiththefollowingequations:  m   C AvVv Qb  (1) AV Qc  Forairinflow,     AvCm Ki    Cp     (2) A Cps  Forairoutflow,     AvCm Ko    Cp1CHi     (3) A CpsCHc  where  A tunnel

14、area(m2)  Av reliefshaftarea(m2)  Cm  ratioofmassflowratethroughreliefshafttomassflowratethroughtunnel Cp upstreamreliefshaftheadloss  Cps reliefshaftheadloss  CHC  couplinglossesrelatedtoconfigurationoftheinterfacebetweentunnelandreliefshaft CHi entrancelossatthebottom

15、ofreliefshaft  Ki, Ko empiricalconstantsforinflowandoutflow  Qb, Qc  airflowvolumeratethroughreliefshaftandupstream(ordownstream)(m3/s) V airvelocityattunnel(m/s)  Vv airvelocityatreliefshaft(m/s)  Thespacegeometryofamodernsubwaystationistypicallycomplex.Thetrainoperationisaprimefactorforthepistoneffects.Thetrainmovementintunnelisahighlytransientairmovingproblem.Theaboveequationsareinsufficienttoanalyzethetransientairmovementinthetunnelandtheventilationshaft.TheenvironmentalcontrolandtheairmovementareanalyzedfrequentlyusingSES.