Numerical Investigation of Entropy Generation and Optimization on a Centrifugal Fan

作者：Wang, Songling^*; Zhang, Lei; Zhang, Qian; Ye, Xuemin

来源：Advanced Science Letters, 2011, 4(6-7): 2240-2245.

DOI：10.1166/asl.2011.1634

• Centrifugal Fan
• Entropy Generation
• Optimization
• Least Squares Method

The characteristics of three-dimension flow field and entropy generation of a centrifugal fan have been numerically simulated based on the standard k-epsilon turbulence model with Fluent and the simulating results are verified with experiments. Dissipation term in the energy equation is not neglected and used to calculate the generation of entropy. Computed results show that the entropy generation caused by turbulent dissipation is apparently stronger than that of viscous dissipation, and the zones near the inlet of blade cause the higher level of entropy generation. Taking the efficiency maximizing as a function goal, while the blade number and outlet blade angle being regarded as the variable quantities, the fan impeller parameters are optimized based on the least squares method. The optimized results indicate that the performance of the centrifugal fan has been improved by lowering the entropy generation which caused by the secondary flow vortex, the wake-jet and the angle of attack. For optimized fan, the full pressure and fan efficiency increase by 3.7% and 0.5%, respectively.

• 出版日期2011-7
• 单位华北电力大学