Abstract
A numerical study of the interaction of weak normal shock waves with turbulent jets was conducted. The cone guration consisted of a planar jet of air, helium, or carbon dioxide situated on the centerline of a shock tube withanaircoe ow.Theshockstrengthswere Ms =1:2and1:4.Thenumericalmodelwasbasedon atime-dependent, Navier‐Stokes approach and a two-equation q‐! turbulence model. The results indicate that passage of a shock through low-density (helium)jets produces a vortexlike structure not seen for the case of the air or carbon dioxide jets. Helium jets exhibit a decrease in mean jet e uid concentration due to shock interaction of up to approximately 30% at a location 30 jet exit heights downstream of the jet exit for a shock strength of Ms =1:4. The amount of mixing enhancementincreases with increasing shock strength and decreases with increasing downstream distance. In comparison, the air and carbon dioxide jets show a signie cantly smaller degree of mixing enhancement. These results are qualitatively consistent with recent experimental results in axisymmetric, turbulent jets subject to normal shock passage.
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