Heat Transfer and Performance Characteristics of Axial Cooling Fans with Downstream Guide Vanes  

作　　者：Alexandros Terzis Ioannis Stylianou Anestis I. Kalfas Peter Ott 

机构地区：[1]Group of Thermal Turbomachinery (GTT) School of Engineering, EPFL-SCI-STI-PO, CH-1015, Lausanne, Switzerland [2]Laboratory of Fluid Mechanics and Turbomachinery Dept. of Mechanical Engineering, School of Engineering Aristotle University of Thessaloniki (AUTH), GR-54124, Thessaloniki, Greece

出　　处：《Journal of Thermal Science》2012年第2期162-171,共10页热科学学报（英文版）

摘　　要：This study examines experimentally the effect of stators on the performance and heat transfer characteristics of small axial cooling fans. A single fan impeller, followed by nine stator blades in the case of a complete stage, was used for all the experimental configurations. Performance measurements were carried out in a constant speed stage performance test rig while the transient liquid crystal technique was used for the heat transfer measurements. Full surface heat transfer coefficient distributions were obtained by recording the temperature history of liquid crystals on a target plate. The experimental data indicated that the results are highly affected by the flow conditions at the fan outlet. Stators can be beneficial in terms of pressure drop and efficiency, and thus more economical operation, as well as, in the local heat transfer distribution at the wake of the stator blades if the fan is installed very close to the cooling object. However, as the separation distance increases, enhanced heat transfer rate in the order of 25% is observed in the case of the fan impeller.

关 键 词：axial fans STATORS PERFORMANCE thermochromic liquid crystals transient heat transfer 

分 类 号：TH432[机械工程—机械制造及自动化]