The Existence of Karman Vortex Streets of Unequal Vortex Strengths and Possible Forms of Wake Flow Behind Bluff Bodies

摘要

Using stability analysis and basic theory of the necessary conservation of circulation for a steady or periodic-steady flow it is shown that a double-row vortex street with unequal vortex strengths must be basically unstable. The periodic wake flow behind a bluff body can thus consist of either a conventional Karman vortex street or a heterogeneous vortex zone. In both cases a relatively simple criterion for the determination of separation points can be derived.