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Experimental Investigation of the Effects of Base Mass Addition on the Near Wake of a Slender Body

Lewis, John E. and Behrens, Wilhelm and Collins, Donald J. (1971) Experimental Investigation of the Effects of Base Mass Addition on the Near Wake of a Slender Body. AIAA Journal, 9 (8). pp. 1506-1513. ISSN 0001-1452. doi:10.2514/3.49953.

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The near wake of a two-dimensional wedge was studied at Mach 4. Static pressure, Pitot pressure, total temperature, injectant concentration and hot-wire fluctuations were measured. Helium, argon, and SF_6 were injected into the base, and their diffusion in laminar and turbulent wakes was studied. The locations of the wake stagnation points as a function of injection rate, and the critical rates required to eliminate the recirculating flow were determined. It was found that the near-wake flow with injection does not scale with the mass flux, nor do the momentum or the volume fluxes serve to correlate the data over the entire range of injection. Fluctuation measurements show that SF_6 has a destabilizing effect on the wake, whereas helium has a stabilizing influence, compared to the wake without injection. Model cooling (T_w/T_0∞ = 0.25) resulted in a forward shift of the rear stagnation point and a pronounced decrease in both the velocity defect and the wake width but had a lesser effect on the distribution of the injected species.

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Additional Information:© 1971 AIAA. Presented as Paper 70-110 at the AIAA 8th Aerospace Science Meeting, New York, January 19-21, 1970. Submitted March 16, 1970; revision received April 23, 1971. This research was supported by the Advanced Research Projects Agency under Contract F04701-69-C-0119 and monitored by SAMSO, Norton Air Force Base, San Bernardino, Calif. The authors gratefully acknowledge the cooperation of NASA and the JPL wind-tunnel staff.
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Advanced Research Projects Agency (ARPA)F04701-69-C-0119
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AIAA Paper70-110
Issue or Number:8
Record Number:CaltechAUTHORS:20170731-132632622
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Official Citation:Experimental Investigation of the Effects of Base Mass Addition on the Near Wake of a Slender Body JOHN E. LEWIS, WILHELM BEHRENS, and DONALD J. COLLINS AIAA Journal 1971 9:8, 1506-1513
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79607
Deposited By: Tony Diaz
Deposited On:01 Aug 2017 19:36
Last Modified:15 Nov 2021 17:49

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