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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Abstract
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 |
| URI: | http://nal-ir.nal.res.in/id/eprint/4359 |
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