关键词: 大涡模拟, 强化传热, 涡流发生器, 斜截椭圆柱

Abstract: The flow and heat transfer characteristics of rectangle channel with inclined-cut ellipsoidal vortex generator are obtained with large eddy simulation. The instantaneous properties of velocity, temperature and pressure in channel are gained. The variety process of temperature, pressure and inducted vortex are revealed. Meantime, the heat transfer enhancement mechanism of vortex generator and flow structure are discussed. The turbulent model is used for verifying correctness of large eddy simulation in calculation of rectangle channel without vortex generator in the same calculation condition. The calculation result with two methods is consistent. The result of simulation indicates that the vortex can be induced by vortex generator. Furthermore, the stream-wise vortex induced by vortex generator pays more important role in heat transfer enhancement. Compared with the channel without inclined-cut ellipsoidal vortex generator in the same condition, the local heat transfer coefficient is enhanced from 64%~105%, and the average heat transfer coefficient is enhanced from 17%~36%. The enhancement of local heat transfer coefficient is occurred nearby the vortex generator. There is a consanguineous relationship between the fluid flow structure and status in near wall region with the local heat transfer.

Key words: Inclined-cut ellipsoid, Heat transfer enhancement, Large eddy simulation, Vortex generator