Steady pressure measurements in the strap on booster interference Region of 1/20 scale ASLV configuration

Sajeer, Ahmed and Selvarajan, S and Varambally, BS and Sivaramakrishnan, AE and Pandyan, S (1987) Steady pressure measurements in the strap on booster interference Region of 1/20 scale ASLV configuration. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

Windˇtunnelˇstudiesˇwereˇcarriedˇoutˇtoˇobtainˇpressureˇdistribution inˇtheˇstrapˇonˇboosterˇ interferenceˇregionˇof ˇ1/20thˇscaleˇAugmented Satelliteˇ Launchˇ Vehicleˇ modelˇconfigurationˇˇTestsˇwereˇ doneˇinˇthe 1.2mˇtunnelˇatˇNALˇinˇtheˇMachˇnumberˇrangeˇofˇ0.5ˇtoˇ2.5ˇforˇthe cleanˇconfigurationˇ asˇ wellˇasˇwithˇ springˇhousingˇattachmentsˇonˇthe strapˇonˇ boostersˇ Bothˇtheˇmodelˇconfigurationsˇwithˇtheˇboosters strapped onˇtoˇtheˇcore ˇ vehicleˇinˇtheˇhorizontalˇplaneˇ ˇpitchˇˇandˇin theˇverticalˇplaneˇˇyawˇˇwereˇ testedˇforˇincidencesˇatˇ0ˇˇ4ˇandˇˇ4ˇdeg ˇ Inˇadditionˇpressureˇmeasurementsˇwereˇalsoˇdoneˇonˇtheˇcoreˇvehicle aloneˇatˇMachˇnumbersˇ2ˇ1ˇˇ2ˇ5ˇ andˇ3ˇ0ˇforˇ0ˇˇt4ˇdegreeˇincidences. The ˇˇtestˇReynoldsˇ numberˇwasˇvariedˇfromˇ0.7ˇtoˇ1.3 ˇmillionsˇbased onˇtheˇmaximumˇdiameterˇ ofˇtheˇmodel ˇ Theˇpressureˇdistributionˇshowedˇsignificantˇinterferenceˇeffects ofˇboostersˇonˇtheˇcoreˇvehicle Itˇisˇobservedˇthatˇtheˇpositiveˇpressure peakˇassociatedˇ withˇ flowˇcompressionˇatˇtheˇflareˇjunctionˇincreases withˇincreaseˇinˇMachˇnumber ˇ inˇtheˇpitchˇplaneˇ theˇnormalˇforce distributionˇremainsˇpositiveˇ alongˇtheˇcoreˇvehicleˇwhereasˇinˇtheˇyaw planeˇitˇ isˇofˇlessˇmagnitude ˇ

Item Type:	Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords:	Launch Vehicle;Steady pressure;Strap on booster; Interference region;ASLV
Subjects:	AERONAUTICS > Aerodynamics
Division/Department:	Aerodynamics, Aerodynamics, Aerodynamics, Aerodynamics , Aerodynamics
Depositing User:	Smt Bhagya Rekha KA
Date Deposited:	03 Oct 2012 10:47
Last Modified:	03 Oct 2012 10:47
URI:	http://nal-ir.nal.res.in/id/eprint/11042

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