期刊
APPLIED THERMAL ENGINEERING
卷 37, 期 -, 页码 241-248出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2011.11.024
关键词
Curved trapezoidal winglet; Vortex generator; Heat transfer enhancement; Flow resistance; Experiment
资金
- Fundamental Research Funds for the Central Universities [09MG25]
- Specialized Research Fund for the Doctoral Program of Higher Education [20070079018]
- Beijing Municipality Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering [KF200708]
- Research Creation Found for Electric Power Youth of China
The performance of a pair of new vortex generators - curved trapezoidal winglet (CTW) has been experimentally investigated and compared with traditional vortex generators - rectangular winglet, trapezoidal winglet and delta winglet using dimensionless factors j/j(0), f/f(0) and R = (j/j(0))/(f/f(0)). The results showed that delta winglet pair is the best in laminar and transitional flow region, while curved trapezoidal winglet pair (CTWP) has the best thermohydraulic performance in fully turbulent region due to the streamlined configuration and then the low pressure drop, which indicates the advantages of using this kind of vortex generators for heat transfer enhancement. Parametric study on CTWP showed that smaller attack angle (beta = 0 degrees = and 15 degrees), larger curvature (b/a = 1/2) and larger angle of inclination (alpha = 20 degrees) gives better thermohydraulic performance under the present conditions. An appropriate spacing between the leading edges of a pair of CTW VG should be considered for different flow regions. In addition, double rows of CTWP do not show better thermohydraulic performance due to the larger pressure drop and the spacing between the two rows of CTWP should also be optimized. (C) 2011 Elsevier Ltd. All rights reserved.
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