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Profile Drag Reduction and Propulsion by Heat Addition on Straight Fronts
Author(s) -
Zierep J.
Publication year - 1999
Publication title -
zamm ‐ journal of applied mathematics and mechanics / zeitschrift für angewandte mathematik und mechanik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.449
H-Index - 51
eISSN - 1521-4001
pISSN - 0044-2267
DOI - 10.1002/(sici)1521-4001(199909)79:9<641::aid-zamm641>3.0.co;2-b
Subject(s) - drag , transonic , drag divergence mach number , mechanics , supersonic speed , reduction (mathematics) , propulsion , aerospace engineering , aerodynamic drag , wave drag , condensation , physics , hypersonic speed , materials science , meteorology , thermodynamics , mathematics , aerodynamics , engineering , geometry
We study the influence of heat addition on a straight supersonic‐, sonic‐, or subsonic front in a fluid field. The ranking of the energy supply is done by calculating the relative drag reduction and by discussion of the propulsion efficiency. The generalized Ackeret‐Formula gives interesting results for both terms. Energy addition comparable with condensation in humid air leads to drag reduction up to 50%. Transonic flow gives interesting consequences but low efficiencies. Hypersonic flow on the contrary with heat supply by burning or detonation on the rear part of the body is very efficient.