Abstract
The influence of steady energy addition into the flow by a low-voltage DC-arc discharge located upstream of conically nosed and spherically blunted bodies was investigated experimentally in the Ludwieg-Tube Facility at Mach 5. The results include drag force measurements and shadowgraph flow visualizations. The flow-field structure, arising due to the bow-shock/heated-wake interaction, as well as the bow-shock intensity and heating power effects on the drag reduction is analyzed in this paper. The results demonstrate the existence of an optimum heating rate, providing a maximum effectiveness of energy addition and showing distinct drag reductions up to 70% dependent on test conditions and model geometries.
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Abbreviations
- c D :
-
drag force coefficient
- c p :
-
specific heat capacity
- D :
-
model diameter or drag force
- L :
-
distance
- M :
-
Mach number
- P arc :
-
electric arc power
- P heat :
-
heating power
- P str :
-
stream-tube energy flux
- P thr :
-
saved thrust power
- q :
-
dynamic pressure
- Re :
-
Reynolds number
- S q :
-
cross-sectional area of the energy source
- S ref :
-
cross-sectional area of the blunt body
- T 0 :
-
total temperature
- U :
-
velocity
- δ :
-
thickness of the heated wake
- \({\epsilon}\) :
-
heating power ratio (=P heat/P str)
- η :
-
power effectiveness ratio (=P thr/P arc)
- ρ :
-
density
- θ :
-
cone half-angle
- ∞:
-
free-stream flow conditions
- 0:
-
conditions without energy deposition or total flow parameter
- ref:
-
model reference parameter
- s :
-
separation parameter
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Communicated by K. Hannemann.
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Schülein, E., Zheltovodov, A. Effects of steady flow heating by arc discharge upstream of non-slender bodies. Shock Waves 21, 383–396 (2011). https://doi.org/10.1007/s00193-011-0307-1
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DOI: https://doi.org/10.1007/s00193-011-0307-1