Library Subscription: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

EFFECT OF INCLINED ANGLE OF PIN ARRAYS ON FLOW AND HEAT TRANSFER CHARACTERISTICS IN FLOW CHANNEL

Get access (open in a dialog) DOI: 10.1615/IHTC16.hte.023884
pages 5601-5610

Abstract

The aim of this research is to study flow and heat transfer characteristics for an array of inclined pins on heat transfer surface in gas turbine blade. The cylindrical pins which having diameter of D=10 mm were mounted on heat transfer surface in the wind tunnel with staggered arrangement. The pin height (H) and pin-to-pin distance (S) were fixed at H=2D, and S=2D, respectively. The effect of pin inclined angle were investigated at θ=30°, 45°, 60°, 90°, 120°, 135°, and 150°. For all experiments, the Reynolds number of air flow was fixed at Re=32,860. The results show that the pin inclined angle with θ=30°, 45° and 60° can enhance the heat transfer on the upstream and downstream of each pin when compared to the case of pin angle θ=90°. While, the pins with inclined angle at θ=120° and 135° can somewhat improve the heat transfer in region behind the pins. However, the pin with inclined angle at θ=150° gives the lowest heat transfer rate overall surface. The numerical simulation was also applied to explain the mechanism of heat transfer. The mechanism of heat transfer enhancement and deterioration for inclined pin can be explained with secondary counter-rotating vortices and wake flow behind the pins.