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Long Penetration Mode Counterflowing Jets for Supersonic Slender Configurations - A Numerical StudyA novel approach of using counterflowing jets positioned strategically on the aircraft and exploiting its long penetration mode (LPM) of interaction towards sonic-boom mitigation forms the motivation for this study. Given that most previous studies on the counterflowing LPM jet have all been on blunt bodies and at high supersonic or hypersonic flow conditions, exploring the feasibility to obtain a LPM jet issuing from a slender body against low supersonic freestream conditions is the main focus of this study. Computational fluid dynamics computations of axisymmetric models (cone-cylinder and quartic geometry), of relevance to NASA's High Speed project, are carried out using the space-time conservation element solution element viscous flow solver with unstructured meshes. A systematic parametric study is conducted to determine the optimum combination of counterflowing jet size, mass flow rate, and nozzle geometry for obtaining LPM jets. Details from these computations will be used to assess the potential of the LPM counterflowing supersonic jet as a means of active flow control for enabling supersonic flight over land and to establish the knowledge base for possible future implementation of such technologies.
Document ID
20140000348
Document Type
Conference Paper
Authors
Venkatachari, Balaji Shankar (Alabama Univ. Birmingham, AL, United States)
Cheng, Gary (Alabama Univ. Birmingham, AL, United States)
Chang, Chau-Layn (NASA Langley Research Center Hampton, VA, United States)
Zichettello, Benjamin (Cooper Union for the Advancement of Science and Art New York, NY, United States)
Bilyeu, David L. (Ohio State Univ. Columbus, OH, United States)
Date Acquired
January 22, 2014
Publication Date
June 24, 2013
Subject Category
Aerodynamics
Report/Patent Number
NF1676L-15643
Meeting Information
AIAA Fluid Dynamics Conference and Exhibit(San Diego, CA)
Funding Number(s)
WBS: WBS 794072.02.07.02.03
CONTRACT_GRANT: NIA-2922
Distribution Limits
Public
Copyright
Public Use Permitted.

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