作者:L. G. Sarasúa、A. C. Sicardi Schifino
DOI:10.1063/1.870409
日期:2000.6
The effect of the viscosity on the linear stability of a swirling top hat jet with nonrotating core is studied analytically. Numerical values of the growth rate are obtained. It is shown that the viscosity induces instabilities in the region of wave numbers where no inviscid instability occurs. In the short wave limit, the asymptotic solution reveals that the situation is quite different for the strictly
分析研究了粘度对具有非旋转核心的旋流大礼帽射流线性稳定性的影响。获得增长率的数值。结果表明,在没有发生无粘性不稳定性的波数区域,粘度会引起不稳定性。在短波极限内,渐近解表明严格无粘性和粘性情况的情况大不相同。虽然在无粘性流体中,增长率与波数成正比,但在粘性情况下,对于大波数,增长率接近恒定值。