Further Investigations of the Laminar-Turbulent Transition in a Free Jet(Annular Nozzle)

摘要

The experimental results and theoretical considerations reported in the following pages are a continuation of earlier investigations devoted to the problem of laminar-turbulent transition in a free jet. The fact, that consecutive ring vorrices and their mutual interaction govern the local transition range in the free boundary of a circular jet, could be sub¬stantiated by improved hot-wire techniques. The law, governing the shedding frequency of the ring vortices as function of the Reynolds Number, has been inspected closely and an influence of the nozzle boundary layer had been found,