Mean and fluctuating pressure field in boat-tail separated flows at transonic speeds AIAA Paper 2001-058213; 13;

Kumar, R and Viswanath, P. R (2001) Mean and fluctuating pressure field in boat-tail separated flows at transonic speeds AIAA Paper 2001-058213; 13;. In: 39th AIAA Aerospace Sciences Meeting amp; Exhibit, 8-11 January 2001, Reno, NV.

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    Abstract

    Experiments were carried out investigating the mean and unsteady surface pressure fluctuations in boat-tail separated flows relevant to launch vehicle configuration at transonic speeds. The tests were performed on a generic axisymmetric body in the Mach number range of 0.7-1.2, and the important geometrical parameters, namely, the boat-tail angle and diameter ratio, were varied systematically. The measurements made included primarily the mean and unsteady surface pressure fluctuations on nine different model configurations. Flow visualization studies employing a surface oil flow and Schlieren technique were carried out to infer features like boundary layer separation, reattachment, and shock waves in the flow. The features of mean and fluctuating surface pressures, including aspects of similarity, are discussed in detail. It is also shown that launch vehicle configurations (having a bulbous or hammerhead nose shape) generate higher levels of surface pressure fluctuations in the reattachment zone than the generic configurations (employed in the present study). A simple correlation is suggested for the maximum value of rms pressure fluctuation in the reattachment zone at different freestream Mach numbers, which can be useful in the preliminary aerodynamic design of a launch vehicle configuration. 13; 13; 13; 13;

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Pressure Oscillations;Boattails;Separated Flow;Transonic Speed;Surface Pressure;Launch Vehicle Configurations;Pressure Distributionboundry Layer Flowschlieren Photographyflow Visualizationmean Square 13; Values13;
    Subjects: AERONAUTICS > Aeronautics (General)
    Division/Department: Experimental Aerodynamics Division, Experimental Aerodynamics Division
    Depositing User: Mr. N A
    Date Deposited: 25 Jan 2006
    Last Modified: 24 May 2010 09:39
    URI: http://nal-ir.nal.res.in/id/eprint/997

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