首页|期刊导航|湖南大学学报（自然科学版）|Large Eddy Simulation of New Vortex Generator Enhancing Heat Exchange of Solar Energy
湖南大学学报（自然科学版）2009，Vol.36Issue(z1)：186-192,7.
Large Eddy Simulation of New Vortex Generator Enhancing Heat Exchange of Solar Energy
Large Eddy Simulation of New Vortex Generator Enhancing Heat Exchange of Solar Energy
摘要
Abstract
This paper put forward a new-type vortex generator enhancing heat exchange of solar air-drier and air-heater on the gas side,and investigated the mechanism of heat transfer enhancement and drag reduction by the influence of vortex generators on the coherent structure of turbulent boundary layer.The flow and heat transfer characteristics of rectangle channel with bevel-cut half-elliptical column vortex generators were obtained using large eddy simulation (LES) and the hydromechanics software FLUENT6.3.The instantaneous proper-ties of velocity,temperature and pressure in channel were gained.The coherent structure of turbulent boundary layer flow was showed, and the characteristic of vortex induced by inclined-cut semi-ellipse vortex generator and its influence on turbulent coherent structure were analyzed.And the effect mechanism of turbulent coherent structure on flow field,pressure field and temperature field was discussed.Based on the results,the heat trans-fer coefficient and drag reduction of the new vortex generator with different pitch angles were compared.Some-times.the coherent effects of the increased wall heat transfer and the decreased skin friction do not satisfy theReynolds analogy.The turbulent coherent structure can be controlled through the geometry of the vortex gener-ator.so the heat transfer and drag reduction can also be controlled.Then we can seek suitable form of vortex generator and structure parameters.in order to achieve the enhanced heat transfer and flow of drag reduction in the solar air-heater and solar air-drier.关键词
large eddy simulation/vortex generator/bevel-cut half-elliptical column/coherent structure/heat transfer enhancementKey words
large eddy simulation/vortex generator/bevel-cut half-elliptical column/coherent structure/heat transfer enhancement分类
能源科技引用本文复制引用
WEN Juan,YANG Li,QI Cheng-ying..Large Eddy Simulation of New Vortex Generator Enhancing Heat Exchange of Solar Energy[J].湖南大学学报（自然科学版）,2009,36(z1):186-192,7.基金项目
Supported by National Natural Science Foundation of China(50676027) （50676027）
