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題名 | Flow Field Analysis of Radially Rotating Channel Flows=徑向旋轉管道流場分析 |
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作 者 | 曾憲中; | 書刊名 | 建國學報 |
卷期 | 21 2002.07[民91.07] |
頁次 | 頁259-267 |
分類號 | 446.0131 |
關鍵詞 | 離心力; 科氏力; 黏滯力; 二次流; 徑向旋轉管導; Centrifugal; Coriolis; And viscous forces; Secondary flow; Radially rotating channel; |
語文 | 英文(English) |
中文摘要 | 絕大部分的動力機械都以旋轉的方式達成動力的轉換。在燃氣渦輪機方面,為提高熱效率(Thermal Efficiency)就必須提高渦輪機的入口溫度,但是高溫將縮短渦輪葉片壽命,所以渦輪葉片必須加強本身的冷卻能力;在電機機械方面,為了減少機械本體高溫導致導電體產生歐姆損失,所以,研發高性能的冷卻設計降低高熱點溫度是迫切需要的。 關於旋轉管流冷卻問題,其旋轉管道內流場及熱傳特性不僅受主流場效應的影響,也受旋轉時衍生 科氏力及離心浮力引起的二次流效應影響,致使流場特性更加複雜。在垂直旋轉流場加熱管道中,流場常因參數不同顯現單對渦流或多對溜流之定流或不定流之層流、紊流特性,除此之外,旋轉常會延緩層紊流過渡氣現象的發生,科氏力及離心浮力引起的二次流與主流場流動方向都是影響內流管道熱傳效果之要因,主要參數有普蘭陀數、雷諾數、旋轉數和葛蘭秀夫數,本研究目的針對徑向旋轉管道作相關參數分析。 |
英文摘要 | Most of power machinery achieves the energy conversion by rotating. In gas turbines, to increase the thermal efficiency, the turbine inlet temperature must be increased, the increased high temperature may cause the material degradation and therefore shortens the turbine blade life. Consequently, the cooling capacity of the turbine should be enhanced. Similarly, the cooling of electrical conductors of electrical machinery should be also improved to reduce the machine volume and prolong the machine life. Due to the strong interaction among centrifugal, Coriolis, and viscous forces of the coolant air flow in rotating channels, the flow field becomes more complex than for non-rotating ones. In a heated radially rotating channel, a pair or multi-pairs of vortices may appear in the flow filed, depending on the flow and thermal conditions. Therefore, the friction and heat transfer increase simultaneously. Besides, the centrifugal buoyancy may also affect he heat transfer. The main governing paramenters are Pradt1 number, Reynolds number for forced convection, rotation number for Coriolis-force-induced cross-stream secondary flow and the Grash of number for centrifugal buoyancy. One of the major attempts in the present study was to summarize the parametric analysis for heat transfer in a radially rotating channel. |
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