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頁籤選單縮合
題名 | Two Phase Instabilities of Organic Rankine Cycles=有機流體朗肯循環之雙相不穩定分析 |
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作者姓名(中文) | 王曉剛; 張欽柏; | 書刊名 | 義守大學學報 |
卷期 | 4 1997.08[民86.08] |
頁次 | 頁199-218 |
分類號 | 440.137 |
關鍵詞 | 流量不穩; 雙相流; 有機流體; 壓力降; Flow excursion; Instability; Organic fluid; Pressure drop; |
語文 | 英文(English) |
中文摘要 | 本研究是對以有機流體為工作流體之朗肯循環產生流量不穩定現象做一評估。本 研究證明以R11為工作流體,在低流量、低熱通量之條件下,系統壓力降恆與流體流量成正 比,固無產生流量不穩定現象之顧慮。然當流量及熱通量增加時,管路產生雙相流而其壓 力降,尤其加速度項及磨擦力項,均有增加流量反而減少壓力降之特性,故在此流體情況下 (例如實際發電廠之大小),以有機流體為工作流體之朗肯循環必須考慮到其產生流量不穩定 現象之可能,而在幫浦之選用及流量控制上預防其發生。 |
英文摘要 | Flow excursion which could result in system instability is examined for a heated channel using R11 as the working fluid. It can be concluded that flow excursion is not likely to occur under the flow conditions used in a prototypic loop due to low heat fluxes and low mass fluxes. However, flow excursion and instability is likely to occur if heat fluxes and mass fluxes are raised. The pressure drop for two-phase flow is mainly composed of the acceleration term resulted from phase change. This means that the pumping power which determines mass flux must be carefully controlled in order to operate a system with a flow rate which would not exceed the threshlod for the flow excursion to occur. It is also shown that flow excursion and instability might be avoided by raising the system pressure to suppress peaking of the pressure drop. |
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