Computational investigation of flow and heat transfer for a row of circular jets impinging on a concave surface

A computational investigation is carried out to study the flow and heat transfer from a row of circular jets impinging on a concave surface. The computational domain simulates the impingement cooling zone of a gas turbine nozzle guide vane. The parameters which are varied in the study include jet Reynolds number (Red=5000 to 54000). inter-jet distance to jet diameter ratio (c/d = 3.33 and 4.67) and target plate distance to jet diameter ratio (h/d=1, 3 and 4). The flow field, predicted with K- ω turbulence model (using Fluent 6.2), is characterized with the presence of a pair of counter rotating vortices, an upwash fountain flow and entrainment. The local pressure coefficient and Nusselt number variations along the concave plate are presented and these values are found to under predict the some available experimental data by about 12%. Copyright © 2006 by ASME.