Axisymmetrical rotating jets

The article presents computation results for a free jet emerging from a nozzle of radius R with Mach number M = 1 and nonrated value n = 3. The jet rotates at the nozzle outlet with constant angular velocity ω = 2 and corresponding circular velocity W = ωr (r < R ). The computation results for this jet are compared with those for a laminar (non-rotating) jet with the same fluid-dynamic parameters. The numerical results corroborate the theoretical conclusions concerning the effect of jet rotation on flow structure. Specifically, it is confirmed that the mixing of the jet with the surrounding gas is more intense and that a strongly twisted jet exhibits backflow toward the nozzle in the axial region. Translated from Prikladnaya Matematika i Informatika, No. 28, pp. 44–49, 2008.