Experimental Study of temperature distributions onPower Delivery Mechanism of All Wheel Drive Vehicles

• Main Authors: Chang Tseng Hsien, 曾憲章
• Other Authors: Wu Chang Chieh
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/03220274420722496686

碩士 === 建國科技大學 === 機電光系統研究所 === 92 === Most of power machinery achieves the energy conversion by rotation. Similarly, the cooling rotary blade coupling for real time all wheel drive vehicle should be also improved to prolong the machine life. In high rotation speed machine, the centrifugal force and Coriolis force will affect the mass and heat transfer in the rotating machine. Rotating effect will enforce the turbulence of the flow channel in the flow field. This instability Taylor vortices will dominate the flow pattern and heat transfer. The wavy temperature distribution will damage the rotary blades. This project is to analyze the local heat transfer of the viscous coupling unit. To simulate the operation conditions in a rotary blade coupling, one must keep related parameters approximately the same values as those in a real one. To understand further the local heat transfer characteristic on the rotor side, stator side and sidewalls for rotating channels with the real working parameters, the axial and radial temperature distribution was measured in the viscous coupling unit. The mechanism of the influence of Taylor vortices were detailed by examining local thermal characteristics. A full-plane thermal imager measured the overall temperature distributions on the viscous coupling unit and the rear differential. One of the main goals of this study was to summarize the experimental results with various circumferential ribbed turbulators to enhance heat transfer. Empirical correlations for local heat transfer in the considered ranges of real parameters are proposed. The correlations are useful for designing a viscous coupling unit in a 4WD vehicle.