Inviscid counterflow jets from aligned nozzles

Abstract eng:
This paper examines the inviscid interaction of two planar counterflowing streams of different gases issuing from two aligned nozzles of equal radius R separated a distance H. The problem is relevant in connection with the counterflow burners used in laboratory experiments to characterize flame response to strain. The computation of the inviscid flow involves integration of the Euler equations, with the outer jet boundaries and the interface separating the two jets appearing as free surfaces, to be obtained as part of the solution. It is shown how introduction of a single density-weighted stream function facilitates the description. While conformal mapping can be used to determine the solution for irrotational flow, numerical integration is required in general, with simplified limiting solutions arising in the limiting cases H/R ! 1 and H/R " 1.

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