臺灣博碩士論文加值系統

本文基於有限體積法FVM(Finite Volume Method)模擬三維旋轉式壓縮機來探討流場、渦流特性、渦流產生機制，並與實驗壓縮機進行各項冷凍能力驗證，誤差約正負3%。並進行幾何變更來比較冷凍能力與流場差異性。

結果顯示，壓縮機進行壓縮時，壓縮腔高溫高壓冷媒會透過葉片(Blade)與活塞(piston)間隙、活塞與汽缸(cylinder)間隙洩漏至吸入腔。在排放閥(valve)開啟前排放閥與通道(channel)間隙亦產生外部冷媒洩漏至壓縮腔形成小渦流，並與活塞壓縮過程產生之大渦流互相干涉。

壓縮冷媒在排放閥開啟時無法完整排出，係因月牙欠缺(vent)與葉片之間存在死區，殘餘冷媒存在於死區與通道內，前者因活塞阻檔月牙欠缺無法順利排出，後者為冷媒壓力不足。兩者皆在活塞旋轉位移至汽缸正上方時，因活塞與汽缸間隙逆流至壓縮腔，殘餘冷媒在此間隙達到1.77 Mach Number (馬赫)，在月牙欠缺入口處觀測點達到1 Mach Number。

The numerical analysis flow structure and performance of the rolling piston compressor are conducted with FVM. In addition,this study also compared the ability with compressor of different geometry.

The results show that the refrigerant leaks to the suction chamber through the gap as well as create vortexs in the compression chamber before the discharge valve opens when the compressor in processing.There is an interaction between vortexs.

Furthermore the compressed refrigerant is not fully discharged when the discharge valve is opened(residual refrigerant).The residual refrigerant exist in the zone and channel,respectively.the former is due to the piston block the vent, while the latter is due to insufficient pressure.

Residual refrigerant flows reversely to the compression chamber due to the interval between the piston and cylinder.when the piston displacement to the above of cylinder which is achieve 1.77 Mach Number in interval,1 Mach Number in front of the vent,respectively.

總目錄

誌謝 1
中文摘要 2
Abstract 3
總目錄 4
表目錄 6
圖目錄 7
符號說明 13
第一章 緒 論 15
1-1 前言 15
1-2 研究背景 15
1-3文獻回顧 16
第二章 計算分析方法 20
2-1 計算流體力學簡介 20
2-1-1 CFD軟體簡介 20
2-1-2 有限體積法(Finite Volume Method) 20
2-1-3 離散化(Discretization) 21
2-1-4 SIMPLE法計算流程 23
2-1-5 紊流模型 25
2-2 數值模擬 27
2-2-1 設定流體性質 28
2-2-2滾動活塞壓縮機幾何建模 30
2-2-3滾動活塞壓縮機網格配置 32
2-2-3-1 入口網格配置 32
2-2-3-2 汽缸網格配置 33
2-2-3-3 月牙欠缺網格配置 33
2-2-3-4 通道網格配置 34
2-2-3-5 排放閥網格配置 35
2-2-3-6 出口網格配置 37
2-2-3-7網格交互面配置 37
2-2-4 設定邊界及初始條件 39
2-2-5 設定時間步階 40
第三章 模擬結果分析 41
3-1網格獨立性分析 41
3-2 簡化模型與實驗驗證 48
3-3 簡化模型流場模擬結果 55
3-3-1 簡化模型汽缸與排放閥流場剖面壓力分佈 56
3-3-2 簡化模型汽缸與排放閥流場剖面溫度分佈 60
3-3-3 簡化模型數據分析 64
3-3-4 簡化模型之流線圖 70
3-4 簡化模型之幾何變更 87
3-4-1 簡化模型之幾何變更模擬結果與數據分析 89
3-4-2 簡化模型與幾何變更結論 121
第四章 結論 124
附件1 125
附件2 128
參考文獻 131

[1]黃思、楊國蟒、蘇麗娟,“應用動網格技術模擬分析滾動轉子壓縮機的瞬態流動”流體機械, Vol. 38, pp.1-4, 2010

[2]Hui Ding、Haiyang Gao,“3-D Transient CFD Model For A Rolling Piston Compressor With A Dynamic Reed Valve”International Compressor Engineering Conference, pp.1-11, 2014

[3]Dehua Cai、Guogeng He、Tetsuhide Yokoyama、Qiqi Tian、Xiaohan Yang、Jiao Pan,“Simulation and comparison of leakage characteristics of R290 in rolling piston type rotary compressor”International Journal Of Refrigeration, pp.42-54, 2015

[4]Jose´ Luiz Gasche、Thiago Andreotti、Ca´ssio Roberto Macedo Maia,“A Model To Predict R134a Refrigerant Leakage Through The Radial Clearance Of Rolling Piston Compressors”International Journal Of Refrigeration, Vol. 35, pp.2223-2232, 2012

[5]Chun Hui Liu、Wei Geng,“Research On Suction Performance Of Two-Cylinder Rolling Piston Type Rotary Compressors Based On CFD Simulation”International Compressor Engineering Conference, pp.1-7, 2004

[6]Balázs Farkas、 Viktor Szente、Jenő Miklós Suda,“A Simplified Modeling Approach For Rolling Piston Compressors”Periodica Polytechnica Mechanical Engineering, Vol.59,pp.94-101, 2015

[7]Joerg Mayer、Preben Bjerre、Fabian Brune,“A Comparative Study Of Different Numerical Models For Flapper Valve Motion”International Compressor Engineering Conference, pp.1-9, 2014

[8]Shebing Liang、Sihai Xia、Xiaoli Kang、Peng Zhou、Qiang Liu,“Investigation Of Refrigerant Flow Simulation And Experiment Of Rolling Piston”International Compressor Engineering Conference, pp.1-9, 2010

[9]Kamal Sharma、Koteswara Rao、Kiran M. N. S/ V、Anil Gopinathan,“CFD Analysis Of Discharge Gas Flow In Rotary Compressor For OCR Reduction”International Compressor Engineering Conference, pp.1-9, 2010

[10]R.J. Rodgers、J. J. Nieter,“Comprehensive Analysis Of Leakage In Rotary Compressors”International Compressor Engineering Conference, pp.1-8, 1996

[11]H. Ding、F. C. Visser、Y. Jiang、M. Furmanczyk,“Demonstration And Validation Of A 3D CFD Simulation Tool Predicting Pump Performance And Cavitation For Industrial Applications”Journal of Fluids Engineering, Vol.133,pp.1-14, 2011

[12]Brian Launder,“The Numerical Computation Of Turbulent Flow Computer Methods” Computer Methods In Applied Mechanics And Engineering, pp.269-289, 1974