臺灣博碩士論文加值系統

以微型渦輪引擎為載具的先進微電力或微動力系統，除微小化以外，也要求其具有高效率以節省能源，來因應石化能源逐漸短缺的窘境，因此採用廢熱回收之復熱式循環系統就成為高效率微型渦輪引擎之基礎系統，其中影響系統效率最關鍵的因素，就是復熱器的效能與流體通過復熱器之壓力損失等性能表現，因此高性能、低壓損、體積小、製程簡單的復熱器設計，就成為研究發展之重點。本研究是針對創新設計且具有專利之瑞士卷復熱器，以理論公式推導與數值模擬來進行其熱性能設計與分析。
瑞士卷復熱器基本上為表面型之逆向流渦旋平板熱交換器，是由兩片平板互相捲繞而成，產生了兩個方形截面之同心流道，理論上具有高效能、低壓損之優越性，本研究建立其性能設計工程方法，包括性能評估與尺寸估算方法，並分析其性能特徵，探討瑞士卷復熱器之圈數與流道寬度對性能與壓損的影響，以及質量流率、冷、熱流體比熱、熱傳單元等參數在設計上所扮演之角色；最後透過數值模擬計算進行熱流分析，以驗證各設計參數對瑞士卷復熱器性能的影響，探究流道內之流體現象與熱傳控制等機制，對復熱器性能改善與微型渦輪引擎性能提升將有莫大助益。

For the advanced micro-power systems based on the use of microturbine, the major considerations are the compact size as well as the higher efficiency for the purpose of energy-saving. An exhaust heat recovery recuperated system then becomes mandatory in order to achieve higher efficiency. The paramount requirements for recuperator are high effectiveness and low pressure loss. The thermal designs are studied intensively with a Swiss-roll type heat exchanger that has the characteristics of high effectiveness, low pressure loss, compact size and adaptability to simple production method. In this thesis, the study is aimed at the thermal design and the model computations of the proposed Swiss-roll reucperator for future higher efficiency microturbines. The Swiss-roll recuperator is basically the primary-surface type. It is composed of two flat plates that are wrapped around each other, creating two concentric channels of highly rectangular cross-section. Theoretically, it has the advantages of high effectiveness and low pressure loss. Here, the thermal design methods including rating and sizing are made for the Swiss-roll recuperator. The thermal characteristics are then analyzed, describing the effects of number of turns and channel size on the effectiveness and pressure loss . The roles of the mass flow rate, the specific heat of the flow, and the number of transfer unit are also investigated. Finally, the results from model computations are used to support the detailed design, and to understand the physics for the fluid and thermal science of the system. The theoretical studies and model analysis for the Swiss-roll recuperator are helpful for the improvement of the recuperators and microturbins.

指導教授推薦書 iii
口試委員審定書 iii
授權書 iii
誌謝 iv
中文摘要 v
英文摘要 vi
目錄 vii
圖目錄 x
表目錄 xv
第一章 緒論 1
1.1 研究背景 1
1.2 文獻回顧 5
1.3研究目標 12
第二章 瑞士卷復熱器初始設計方法 13
2.1 UA-LMTD-F法 14
2.2 ε-NTU法 17
2.3 壓損計算 20
2.4 幾何尺寸與效能之關係 21
2-5 幾何尺寸與壓損之關係 23
第三章 瑞士卷復熱器數值模型建立 25
3.1 模型參數設計 26
3.2 建構計算網格 26
3.3 物理性質設定 32
3.4 邊界條件設定 33
3.5 計算與後置處理 36
第四章 結果分析與討論 39
4.1 二維數值模型與初始設計方法之比較 39
4.1.1 不同熱、冷流道寬度比值 40
4.1.2 同效能下之不同圈數 44
4.1.3 不同效能下之最低圈數 48
4.2 二維數值模型參數變化 50
4.2.1 二維模型之不同圈數 52
4.2.2 二維模型之不同冷流道寬度 54
4.2.3 二維模型之不同質量流率 56
4.2.4 二維模型之不同平板厚度 58
4.2.5 二維模型之不同平板材料 60
4.3 三維數值模型 62
4.4 三維數值模型參數變化 68
4.4.1 三維模型之不同圈數 68
4.4.2 三維模型之不同冷流道寬度 70
4.4.3 三維模型之不同質量流率 71
4.4.4 三維模型之不同平板厚度 73
4.4.5 三維模型之不同平板材料 75
4.5 隔板式與棋盤式三維數值模型 77
4.6 綜合比較與分析 85
4.6.1 數值模型之定性分析 85
4.6.2 數值模型之定量分析 87
4.6.3 運用定性與定量分析之範例 92
第五章 結論 95
參考文獻 97

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