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研究生： 韓岳融
Han, Yueh-Jung
論文名稱： 流道內梯型擋板對質子交換膜燃料電池性能增益之研究
Study on effect of trapezoid baffles in flow channel on performance of PEM fuel cells
指導教授： 吳鴻文
Wu, Horng-Wen
學位類別： 碩士
Master
系所名稱： 工學院 - 系統及船舶機電工程學系
Department of Systems and Naval Mechatronic Engineering
論文出版年： 2020
畢業學年度： 108
語文別： 英文
論文頁數： 126
中文關鍵詞： 質子交換膜燃料電池 、梯形擋板 、變異數分析 、田口實驗方法 、基因演算法 、阻抗分析
外文關鍵詞： PEM fuel cell, trapezoidal baffle, ANOVA, Taguchi method, Genetic algorithm, Impedance analysis
相關次數： 點閱：158  下載：0 
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    • 本文係以數值計算及實驗研究質子交換膜燃料電池的性能增益。數值計算則分成兩部分，第一部分係以文獻單通道研究之梯型擋板最佳形狀為基礎，建立三維單通道質子交換膜燃料電池的數值模型，透過加裝不同梯型擋板數量1、3、5、7及9個來探討電池的性能，以決定最好性能的梯型擋板數量。
    第二部分係以第一部分的最佳梯型擋板數量，安裝於蛇型全流道為基礎，在四種不同流道位置組合下數值模擬探討電池的性能。得到電池在陰陽極流道於Case III的安排方式下，有最佳的淨功率，其輸出淨功率高於無加裝梯型擋板的流道設計約 8.03 %。
    　　本文實驗透過田口方法L27直交表針對已加裝梯型擋板 (Case III)之蛇形全流道進行實驗，運用L27直交表的五種操作參數 (因子A:電池操作溫度、因子B:陽極入口相對濕度、因子C:陰極入口相對濕度、因子D:陽極化學計量比、因子E:陰極化學計量比），以最少的實驗次數進行相關因子對單電池的性能影響實驗，並利用L27求出各因子的平均S/N，採用遺傳演算法建立連續型替代模型，求出最優組合。最優組合為A: 335 K, B: 75.35%, C: 66.68%, D: 1, E: 1。最優組合的平均品質損失百分較最大功率組合相比提升49.77%。分析最佳參數水準組合及無加裝梯型擋板的流道設計的交流阻抗，以驗證極化性能分析的趨勢。

    This study discusses the best performance of proton exchange membrane fuel cells by numerical calculation and experiment. The numerical calculation consists of two parts. The first part is based on the best shape of the trapezoidal baffle in the single channel study in the literature, and establishes three-dimensional single channel proton exchange membrane fuel cell numerical modeling by adding different trapezoidal baffle numbers 1, 3, 5, 7, and 9 to discuss the performance of the battery to determine the number of trapezoidal baffle with the best performance.
    The second part is based on the optimal number of trapezoidal baffle of the first part, installed in the full serpentine channel, and numerically explores the performance of the fuel cell under the combination of four different flow channel positions. Obtained that the fuel cell has the best net power under the arrangement of trapezoidal baffles in Case III, and its output net power is higher than the design of the flow channel without additional trapezoidal baffles.
    In this study, the five operating parameters of Taguchi method L27 matrix (factor A: the cell temperature, factor B: anode inlet relative humidity, factor C: cathode inlet relative humidity, factor D: anode stoichiometric ratio, and factor E: cathode stoichiometric ratio) were used to conduct experiments on the full serpentine channel with the trapezoidal baffle (Case III) installed. Employing the mean S/N obtained by L27 matrix established a Continuous-type Surrogate Model with genetic algorithm to find the optimum combination, which is A=335 K, B=75.35%, C=66.68%, D=1, E=1. This combination is confirmed to be the best combination by improving the average PRQL by 49.77% compared with the combination of percentage reduction of quality loss (PRQL) by 49.77% compared with the factor combination of maximum electrical power. After analyzing the optimal parameter level combination and the impedance analysis of the flow channel design without additional trapezoidal baffle, the trend of polarization performance analysis is verified.

    摘要 I Abstract III 誌謝 V Table of Content VI List of Table X List of Figure XI Nomenclature XIV Chapter 1. Introduction 1 1.1 Overview 1 1.2 Characteristics of fuel cells 2 1.3 Literature review 4 1.4 Background and motivation 10 Chapter 2. Numerical Description of PEM Fuel Cell 12 2.1 Geometric model 12 2.1.1 Single channel geometry of fuel cell 12 2.1.2 Installation locations of baffle row in a serpentine channel 13 2.2 Assumptions 13 2.3 Governing equations 14 2.3.1 Continuity equation 14 2.3.2 Momentum conservation equation 14 2.3.3 Energy conservation equation 15 2.3.4 Species transport equation 15 2.3.5 Charge equation 16 2.3.6 Water transport equation 17 2.4 Boundary conditions 19 2.5 Numerical method 20 Chapter 3. Experimental Instruments of PEM Fuel Cell 21 3.1 PEM fuel cell experimental system 21 3.2 Electronic load instrument 21 3.3 Heating system of PEM fuel cell 21 3.4 The EIS measurement instrument 22 3.5 Single serpentine fuel cell 22 3.6 Heating-type humidification system 23 3.7 Measurement uncertainty 23 Chapter 4. Experimental Methods of PEM Fuel Cell 26 4.1 Experiment procedure 26 4.1.1 Analysis information 26 4.1.2 Confirmatory test 28 4.1.3 PEM fuel cell component assembly 29 4.2 Polarization curve 30 4.2.1 Activation loss 31 4.2.2 Ohmic loss 32 4.2.3 Mass transfer loss 32 4.3 Taguchi method 33 4.3.1 Taguchi orthogonal array 34 4.3.2 S/N and quality characteristics 36 4.4 Principal component analysis (PCA) 38 4.5 Percentage reduction of quality loss (PRQL) 40 4.6 Genetic Algorithm 43 4.6.1 Fitness function 44 4.6.2 Calculation method 45 4.7 Fuel cell activation process 48 4.8 Heating with humidification of inlet relative humidity 49 4.9 Electrochemical impedance spectroscopy (EIS) 50 4.10 EIS analysis of PEM fuel cell 50 Chapter 5. Results and Discussion 52 5.1 Model validation for original serpentine flow channel 52 5.2 Numerical Simulation Analysis 52 5.2.1 Effects of baffle numbers on fuel cell performance and pressure drop for single channel 52 5.2.2 Effects of baffles position on entire performance and pressure drop loss for serpentine channel 54 5.2.3 Distribution of reactant gases, temperature and water saturation inside the flow field 56 5.3 Experimental Analysis of Taguchi Method 58 5.3.1 An analysis of variance (ANOVA) analysis for the optimization parameter combination of the S/N 59 5.3.2 The Predicted value of optimal parameter for S/N under confidence interval 60 5.3.3 Comparison of confirmation experimental and forecast results 61 5.3.4 The optimal factor combinations of multi-objective 61 5.4 The PCA (optimal condition obtained with principal component analysis) method 61 5.5 Comparison of the optimum results between single and multiple objective for design model of case III by PRQL 63 5.6 Optimal conditions with different single objectives and multi-objective by experiment 65 5.7 Impendence analysis of PEM fuel cell 66 Chapter 6. Conclusions and Future Work 68 6.1 Conclusions 68 6.2 Future work 70 References 71

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