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題名 | Engine High-Pressure Gradient Flow Regions Turbulent Convective Heat Transfer Analysis=引擎高壓力梯度區之紊流對流熱傳分析 |
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作者姓名(中文) | 張一屏; | 書刊名 | 力學 |
卷期 | 10:4 1994.12[民83.12] |
頁次 | 頁311-316 |
分類號 | 440.137 |
關鍵詞 | 紊流熱邊界層; 壓力梯度; 對流熱傳; Turbulent thermal boundary layer; Pressure gradient; Convective heat flux; |
語文 | 英文(English) |
中文摘要 | 高壓力梯度區之紊流對流熱傳為引擎系統分析之重要參考,但現今引擎多維模擬 程式中所採用之熱對流模式均未將壓力梯度造成之加減速影響加以考慮。本研究以壓力梯度 修正之熱對流邊界層壁面函數配合引擎多維程式 KIVA- Ⅱ, 計算引擎在汽缸頭及活塞碗區 上之高擠壓縮流場壁之對流熱通量。經與實驗值相比較,結果顯示在碗端之環形區中,本研 究所預測值較現今各種模式更接近實驗值,因此知經壓力梯度修正之熱對流模式可供引擎紊 流熱對流及相關工程問題計算時之適度修正。 |
英文摘要 | The convective heat transfer in the regions of high pressure gradient flow region inside internal combustion (IC) engines are important for the engine system design. Current heat transfer models used in engine simulations do not incorporate the effects of pressure gradients. In this study, the pressure-gradicnt-corrected (PGC) thermal wall function were used to find the turbulent convective heat flux in the high-pressure gradient squish flow regions of a motored deep-bowl engine. The PGC model wall function parameters which include a modified friction velocity, wall shear stress, and heat flux were calculated using the engine hydrodynamic simulation code KIVA- Ⅱ. Results of different model predictions were compared with experimental data. The heat fluxes predicted with the PGC model were the most accurate in the high squish region near the bowl edge and annular region between the piston top and cylinder head. This modification provides a feasible approach for the current engine turbulent convective heat flux predictions. |
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