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題名 | 旋轉對於燃氣渦輪機動葉平滑冷卻通道熱傳係數分佈面之影響=Effects of Rotation on Heat Transfer Surface Inside a Smooth-Walled Coolant Channel of Gas Turbine Rotor Blade |
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作者姓名(中文) | 張始偉; 蘇樂梅; | 書刊名 | 中國造船暨輪機工程學刊 |
卷期 | 16:3 1997.08[民86.08] |
頁次 | 頁33-44 |
分類號 | 444.73 |
關鍵詞 | 熱傳; 燃氣渦輪機動葉冷卻; 正交旋轉流體; Heat transfer; Gas turbine rotor blade cooling; Orthogonal-mode rotating flow; |
語文 | 中文(Chinese) |
中文摘要 | 本文針對燃氣渦輪機動葉內冷卻系統中平滑冷卻通道熱傳分佈面受渦輪機旋轉之影響進行實驗研究。實驗設備模擬一典型平滑動葉冷卻通道之詳細幾何形狀。冷卻空氣自葉根流向葉尖。旋轉管進口側則模擬sharp flow entrance及同時發展之熱、流邊界層(thermal and hydraulic boundary layers)。實驗雷諾數、inverse Rossby number及buoyancy number之範圍分別為8,000-35,000;0-0.54及0-1.4。參數範圍包含部份實際引擎運轉範圍。實驗結果顯示,由於旋轉引生之克速力(Coriolis force)會導致旋轉管週界熱傳分佈產生變化。提高克速力之相對強度使得旋轉管週界熱傳係數之變化情形更為顯著。此旋轉管週界熱傳係數之變化並非由向心浮力(centripetal buoyancy)引生(initiation)。但是一旦週向熱傳係數分佈因克速力而形成,於實驗參數範圍內提高向心浮力之相對強度將助於增強週界熱傳係數之變化。由於受sharp flow entry及邊界層重新發展之影響,旋轉管沿週向之熱傳係數變化於管進口端並不顯著。因此一複雜之熱傳係數面即因克速力與向心浮力之影響於旋轉管中產生。 |
英文摘要 | This paper presents the results of an experimental study aimed at investigating the influences of rotation on the full surface heat transfer distributions inside a smooth-walled coolant passage of gas turbine rotor blade. A typical smooth-walled circular test tube with pressurized air-flow directed from root section into the tip section of turbine rotor blade was used. The entry geometry of heat transfer test module simulated the simultaneous development of thermal and hydraulic boundary layers along with the sharp flow entrance. The data ranges covered by this experimental study in terms of Reynolds, inverse Rossby and buoyancy numbers were in the ranges of 8000-35000; 0-0.54 and 0-1.4 respectively. This data range covered parts of real engine operating scenario. The experimental results demonstrated that the circumferential heat transfer distributions were initiated due to the Coriolis forces. Increase of the strength of Coriolis force enhanced the circumferential heat transfer variation. Although the circumferential heat transfer distribution was not initiated by the centripetal buoyancy force, the increase of buoyancy level could enhance the circumferential heat transfer variation as long as the circumferential heat transfer distribution was established due to the Coriolis force. As a result of the sharp flow entrance and the redevelopment of boundary layers, the circumferential heat transfer variation was not able to be clearly identified in the entrance region. Thus, a complex three dimensional heat transfer pattern within a rotating tube was generated by the Coriolis and centripetal buoyancy forces. |
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