Affiliation:
1. Institute of Turbomachinery, Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
2. Institute of Turbomachinery, Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China e-mail:
Abstract
In order to further study the effects of the target channel shape on the cooling performance of the double swirl cooling (DSC), five double swirl channels formed by two overlapping elliptic cylinders with different length ratio between the vertical semi-axis and the horizontal semi-axis are applied. Numerical studies are carried out under three Reynolds numbers. The flow characteristics and heat transfer performance of five DSC cases are compared with the benchmark impingement cooling case. The flow losses, cross-flow development, generated vortices, and velocity distributions inside target channels are illustrated, analyzed, and compared. The spanwise averaged Nusselt number, Nusselt number distributions, and thermal performance are discussed and compared. Results indicate that the largest length ratio between the vertical semi-axis and the horizontal semi-axis of the target channel yields the lowest flow loss, largest overall averaged Nusselt number, and best thermal performance. With the decrease in the length ratio, the heat transfer distribution on the target surface becomes more uniform. The maximum enhancement of overall averaged Nusselt number and thermal performance in DSC is about 30% and 33%, respectively.
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference38 articles.
1. Wang, Z., and Corral, R., 2017, “Numerical Study of Effect of Wall Heating Conditions on Heat Transfer Performance of Internal Cooling Channel,” 12th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, Stockholm, Sweden, Apr. 3–7, Paper No. ETC2017-357.http://oa.upm.es/46012/1/INVE_MEM_2017_245276.pdf
2. Effects of Coolants on the Flow and Heat Transfer Characteristics in a Non-Rotating and Rotating Two-Pass Rectangular Channel;Int. J. Heat Mass Transfer,2015
3. Local Heat Transfer in Internally Cooled Turbine Airfoil Leading Edge Regions—Part I: Impingement Cooling Without Film Coolant Extraction;ASME J. Turbomach.,1990
4. Taslim, M. E., Setayeshgar, L., and Spring, S. D., 2000, “An Experimental Evaluation of Advanced Leading Edge Impingement Cooling Concepts,” ASME Paper No. 2000-GT-0222. 10.1115/2000-GT-0222
Cited by
14 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献