臺灣博碩士論文加值系統

一般電纜線埋在地下水泥孔中，在高壓電傳輸過程中，因電阻所產生的熱
量在孔內累積，造成散熱不佳的問題，進而導致電纜線損毀；因這方面的
資料並不完整，所以進行這方面的研究是有必要的。首先延用Liou and
Jeng (1995,1996) 發展的代數格點產生法( algebraic grid generation
method )，將實際的幾何形狀模擬出來，再應用邊界契合座標系統 (
body-fitted coordinate system )，將複雜的物理平面座標轉換成計算
平面座標作運算，並採用Miller (1988) 提出非交錯格點系統 (
nonstaggered grid system ) 之配置，配合SIMPLEC algorithm計算方法
，對於此類的工程問題，作流場與溫度場的分布模擬，並尋求不良情形之
改善方法。在二維與三維的模擬中，雖因不同的邊界假設得到不同的流場
分布，但都得到一共同的重要結論 : 最高溫均發生在纜線上端，而不是
發生在原先懷疑的纜線下端位置；這與鑑定報告的結果相當符合。

In this work , heat dissipation process from the power cable
placed inside of a underground concrete duct is studied . In
consideration of highly eccentric configuration , the algebraic
grid generation method , proposed by Liou and Jeng (1995,1996) ,
associated with body-fitted coordinate system is used to
transform the physical coordinate into the computational
coordinate . The transformed governing equations of the natural
convective problem are solved in a nonstaggered grid system in
association with the SIMPLEC algorithm and QUICK scheme . It is
found from both two-dimensional and three-dimensional
formulations that the maximum temperatures are all occurred at
the top of the cable no matter what boundary condition
(adiabatic or constant wall temperature) in the surface of
concrete duct is specified .