Jet plume temperature effects on afterbody pressure distribution and drag

Mathur, NB and Yajnik, KS (1985) Jet plume temperature effects on afterbody pressure distribution and drag. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    Abstract

    Experimental investigations were carried out on a typical axisymmetric configuration having a circular arc boattailed13; afterbody, to study the jet plume temperature effects on afterbody pressure distribution and drag. The hot jet was13; produced by burning a mixture of kerosene and air in a combustor located within the model. The experiments carried out at a free stream Mack! number of 0 . 6 213; and jet pressure ratio of about 3.0 show that as the jet temperature ratio is increased the afterbody pressures, tend to increase and the afterbody pressure drag tends to decrease. Experimental results show a reduction in afterbody pressure drag by about 30 to 40 percent when the jet plume temperature is increased from 307'K(cold jet) to13; 945'K. The afterbody surface temperature during the hot jet tests also seemed to affect the afterbody pressure distribution. Both the jet plume temperature and the afterbody surface temperature effects generally contribute to the observed changes in the pressure distribution and drag, unless the experiments are designed to isolate these effects.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Jet plume temperature afterbody;Nozzle wind tunnel pressure drag flow
    Subjects: AERONAUTICS > Aerodynamics
    Division/Department: Fluid Dynamics, Fluid Dynamics
    Depositing User: M/S ICAST NAL
    Date Deposited: 25 Sep 2006
    Last Modified: 24 May 2010 09:50
    URI: http://nal-ir.nal.res.in/id/eprint/2775

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