Mean and fluctuating pressure in boat-tail separated flows at transonic speeds.

Kumar, R and Viswanath, PR and Prabhu, A (2002) Mean and fluctuating pressure in boat-tail separated flows at transonic speeds. Journal of Spacecraft and Rockets, 39 (3). pp. 430-438. ISSN 0022-4650

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    Experiments were carried out investigating the features of mean and unsteady surface pressure fluctuations in boat-tail separated flows relevant to launch vehicle configurations at transonic speeds. The tests were performed on a generic axisymmetric body in the Mach-number13; 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. 13; Flow-visualization studies employing a surface oil flow, and schlieren techniques 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 are discussed in detail13; including aspects of similarity. It has been observed that, on a generic configuration employed in the present study, the maximum levels of surface-pressure fluctuations in the reattachment zone are appreciably lower than those found on launch vehicle configurations having a bulbous or hammerhead nose shape. A simple correlation is suggested for the maximum value of rms pressure fluctuations in the13; reattachment zone at different freestream Mach numbers.

    Item Type: Journal Article
    Additional Information: Copyright for this article belongs to AIAA
    Uncontrolled Keywords: Fluctuation;Launch vehicles;Shock waves;Pressure distribution;Boundary layer separation;Transonic flow;Launch vehicle configurations;Transient response;Surface pressure;Flow visualisation;Configuration interaction
    Subjects: AERONAUTICS > Aeronautics (General)
    Division/Department: National Trisonic Aerodynamic Facility, Experimental Aerodynamics Division, Other
    Depositing User: M/S ICAST NAL
    Date Deposited: 26 Mar 2010
    Last Modified: 07 Jun 2010 16:01

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