Experiments on the Flow in and around Jets Directed Normal to a Cross Flow

Abstract

The present work is done to explain the characteristics of a flow field affected by an interference between a nonuniform cross flow and unheated jets issued from a single circular orifice or a single row of equally spaced circular orifices on a flat floor. Data from measurements of the total pressure and the flow direction and those from flow visualization experiments are presented for a low velocity ratio of 2. In the jet region downstream of a point, at which the minimum jet spread appears in the plane of symmetry of jets, there are large differences between characteristics of a single jet and a component jet of a multiple jet. The floor boundary layer downstream of jet orifices is affected greatly by a circulating flow, which is a vortexlike flow induced within the cross flow. The origin of the circulating flow also is discussed. The mutual interference between component jets of the multiple jet has a great influence on their spreads.