Shock diffraction about a wedge in a gas-microdroplet mixture has been investigated using the compressible two-fluid model. The wall and field variables have been seriously affected by the void fraction and material properties of the microdroplets but not by the microdroplet sizes. The major conclusions can be drawn as follows. 1. The numerical result with the gas-only phase flow has been well compared with the earlier gas-only Euler result, in the limit of vanishing droplet void fraction for the given wedge geometry. 2. The flow field is significantly affected by the void fraction. The relaxation zones are diffused and smaller as the droplet void fraction is increased. The shock wave reflected from the material interface becomes more distinct with the higher droplet void fraction. 3. In the relaxation zone, the gas density increases but the droplet density decreases as the droplet void fraction is raised. 4. The flow field has been not much affected by the size of the microdroplets in the diameter range we investigated, 0.5 micron <= d <= 2.5 micron. 5. The ratio of the peak wall density at the foot of the slip line for the two-phase flow is more than twice than that of the single-phase flow. 6. The relaxation zone by the liquid droplets is qualitatively different from that by the solid copper particles.
Shock wave diffraction about a wedge in a gas-microdroplet mixture
Stoßwellenbeugung um einen Keil in einem Gas-Mikrotröpfchen-Gemisch
International Journal of Heat and Mass Transfer ; 53 , 23/24 ; 5073-5088
2010
16 Seiten, 18 Bilder, 2 Tabellen, 34 Quellen
Article (Journal)
English
Stoßwelle , Keil , Gemisch , Gas , Tröpfchen , Luftfahrzeug , Hochgeschwindigkeit , Aerodynamik , Strömungswiderstand , Wärmeübergang , Hohlraumanteil , Modell , Strömungsfeld , Relaxation , Gasdichte
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