flow_of_a_free_air_j

《flow_of_a_free_air_j》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、FLOWOFAFREEAIRJETElankumaranNagarajan24thApril2012SummaryThestudyofasimpleairjetflow,dischargeintoinertatmospherecanprovideseveralimportantpointsworthyofdiscussioninordertounderstandnotonlyhowtheflowitselfbehaves,butalsoitsimpactonthesurroundings.Suchknowledgeprovesit

2、svalueincommonengineeringapplication.Thisexperimentwascarriedoutbytheuseofsimpleapparatus:aPitot-statictubeusedtomeasurerawdata.ThePitot-statictubeinitselfisabletoprovidereadingsofthedifferencebetweenthetotalandthestaticpressuresatagivenpoint.Applyingbasictheoryofflui

3、ddynamicsitwaspossibletohandlethedatatoprovidewithvelocitydistributionsoftheairflow,whichwasthenusedtoformaplanviewthatenabledtoprovideagoodimageofthewholeflowsystem.Throughextracalculationstheinitialvolumeflowratewasfoundtobe0.01m3/swhiledownstreamitincreasedtoanimpr

4、essivevalueof2.08m3/s,whichleadtotheconclusionthattheflowcausesextraairfromtheatmospheretojointhemovingairsystem10Indexpagenumber·Listofsymbols2·Introduction3·Theory3·Experimentalprocedure3·Results4·Discussion9·Conclusion10·References10Listofsymbols·rwater-densityofwa

5、ter·rair-densityofair·g-gravitationalconstant·Pt-totalpressure·P-staticpressure10IntroductionItisveryimportantasanengineertotakecareofnotonlytheengineeredobjectsbutalsothemediumandsurroundingsinwhichtheobjectswereplaced.Theeffectoftheobjectonthesurroundingmediumorthev

6、iceversashouldbetakenintoaccountevenduringthedesignphase.Themainobjectiveofthisexperimentwastomakevelocitymeasurementsinafreeairjetusingapitot–statictubeandtodemonstratehowauniformjetmixeswithitssurroundings.TheoryThepitot-statictubemeasuredtwopressures–thetotalandthe

7、staticpressure.Thedifferenceofthesepressuresisrelatedtothevelocityasshowninequation(1)Pt–P=½(rair*n2)…………………………………..(1)Ifthispressuredifferenceisappliedtoamanometertoproduceaverticallevelchangeofhmeters,equlibriumisestablishedwhenPt–P=rwatergh………………………………………..(2)Bycom

8、biningequation(1)and(2)andSubstitutingtheappropriatedvaluesofg,randr(9.8m/s,1000kgm-3and1.225kgm-3respectively),thefollowing