두 곡면 벽제트 상호작용에 의해서 형성된 합성제트에서의 3차 모멘트 전달

Abstract

Using hot-wire anemometry, mean velocity and high moments of fluctuating velocity in the merged jet resulting from the interaction of two curved wall jets over a circular cylinder in still air are experimentally investigated. Triple moment budgets are carefully evaluated from measured data. The merged jet can be divided into three regions; the interaction region, the developing region, and the similar region. The magnitude of high order moments(triple and fourth moments) and their variation in the interaction region are much larger than those of the other region and the profiles of these high order moments gradually become similar with downstream distance. The production term due to mean strain rate in the and budgets plays more important role than that due to Reynolds stress. But in the transport, vice versa. The contribution of advection decreases with downstream distance.