Fountain Flows Produced by Multiple Impinging Jets in a Crossflow

摘要

A numerical and experimental study is made of the characteristics of vortex and upwash flows generated by multiple jets in a crossflow. Laser Doppler measurements and flow visualization are presented for turbulent circular jets emerging into a low-velocity cross stream and, then, impinging on a fiat surface perpendicular to the geometrical jet nozzle axis. The experiments were performed for Reynolds numbers based on the jet exit conditions of 6x10~4 and 1.05xl0~5, a jet-to-crossflow velocity ratio of 30, and an impinging height of 5 jet diameters, and they include mean and turbulent velocity characteristics along the two normal directions parallel to the nozzle axis.