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Advances in Mechanical Engineering
Volume 2012 (2012), Article ID 950452, 12 pages
http://dx.doi.org/10.1155/2012/950452
Research Article

Experimental Visualization of the Flow Structure for Jet in Crossflow with a Curved Hole Passage

Key Laboratory of Condition Monitor and Control for Power Plant Equipments, Power and Mechanical Engineering, School of Energy, North China Electric Power University, Beijing 102206, China

Received 4 July 2012; Accepted 19 September 2012

Academic Editor: C. T. Nguyen

Copyright © 2012 Jun Yu Liang and Shun Kang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The objective of this paper is to investigate the influence of a hole curvature on the flow structure and characteristics downstream of JICF (jet in cross-Flow) by means of smoke visualization and particle image velocimetry (PIV). The experiment was performed in a low speed wind tunnel with Reynolds numbers of about 480 and 1000, based on the hole diameter and main flow speed. Two geometries were tested: a circular hole with 90° curvature and a circular straight hole for comparison, under blowing ratios 0.5 and 1.0. The measurements were done in the symmetric plane and four cross-sections. The results show that the curved hole could decrease the mixing behavior of jet flow with the main flow as the hole leading edge also increases the chance of transportingthecoolant to the wall surface and the transverse coverage. The curved hole shows a high potential to increase the cooling effectiveness once it is applied to the turbine blades.