雙螺桿壓縮機於CFD仿真模擬之三維幾何簡化方法建立

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姓名

歐卡沙(Okasatria Novyanto) 查詢紙本館藏

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機械工程學系

論文名稱

雙螺桿壓縮機於CFD仿真模擬之三維幾何簡化方法建立
(A Method of 3-D Geometry Simplification for CFD Simulation of a Twin-Screw Compressor)

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摘要(中)

近年來，雙螺桿壓縮機的性能已可透過計算流體動力學方法（CFD）
快速地進行估算。本研究提出了一種用於雙螺桿壓縮機的CFD 模擬之三
維幾何模型簡化方法。在此方法中，新提出之簡化模型是基於理論方法所
開發，即產生軸向吸氣口和排氣口的轉子輪廓與密封線，而徑向吸入口則
基於三維（3D）轉子曲線。本研究採用台灣漢鐘公司生產的注油式5/6 螺
桿式冷媒壓縮機RE-260，此類壓縮機分別具有五個與六個具專利之獨特齒
形公齒葉與母齒葉。在CFD 模型的開發中使用了三種軟件，即Wolfram
Mathematica、AutoCAD 和SolidWorks，而後將該模型導出到ANSYS Mesh，
以便生成靜態網格。為了將來自轉子域和定子域的一組生成的網格耦合，
可以使用CFD 求解器來執行該作業。TwinMesh 提供了即用型仿真設置。
最後，本研究討論了ANSYS CFX 仿真的結果，以確定新提出的簡化模型
和製造模型之間的幾何適用性。

摘要(英)

Nowadays, the estimation of twin screw compressor performance can be done quickly
by using Computation Fluid Dynamics (CFD). A method of 3-D geometry simplification for
CFD simulation of a twin-screw compressor has been proposed. In this method, the new
suggested simplified model was developed based on theoretical approach, i.e. generating of
rotor profile and sealing line for the axial suction and discharge port, while the radial suction
port based on three-dimensional (3D) rotor curve. This research used an oil-injected 5/6 screw
refrigeration compressor model RE-260 made by Hanbell Co. in Taiwan. This type of
compressor has five and six lobes with patented profile of male and female rotor, respectively.
The development of CFD model used three types of software, namely Wolfram Mathematica,
AutoCAD, and SolidWorks. This model then was exported to ANSYS Mesh for the purpose of
the static grid generation. In order to couple the set of generated grids from rotor domain and
stator domain, CFD solver can be used to carry on this jobs. A ready to use simulation setup
has been provided by TwinMesh. Finally, the results of ANSYS CFX simulation have been
discussed to determine the geometric suitability between the new suggested simplified model
and the manufacturing model.

關鍵字(中)

★ 模型簡化
★ 六面體網格
★ 雙螺桿壓縮機
★ 數值模擬

關鍵字(英)

★ simplification model
★ hexahedral mesh
★ twin screw compressor
★ numerical simulation

論文目次

Chinese Abstract ……………………………………………………………… i
Abstract ……………………………………………………………… ii
Acknowledgement ……………………………………………………………… iii
Table of Contents ……………………………………………………………… iv
List of Figures ……………………………………………………………… vi
List of Tables ……………………………………………………………… vii
List of Symbols ……………………………………………………………… viii
CHAPTER I INTRODUCTION…………………………………………. 1
1-1 Background ………………………………………………... 1
1-2 Problem Statement ………………………………………… 4
1-3 Objectives ………………………………………………..... 5
1-4 Scope of the Study ………………………………………… 5
1-5 Organization of Thesis …………………………………….. 6
CHAPTER II GEOMETRIC CHARACTERIZATION OF THE TWIN
SCREW COMPRESSOR …………………………………..
7
2-1 Geometric Parameters of the Twin Screw Rotor ………….. 7
2-2 Generating of Rotor Profile and Sealing line ……………… 9
2-3 Generating of Three-Dimensional (3D) Rotor Curve ……… 12
CHAPTER III GEOMETRY SIMPLIFICATION FOR CFD MODELING
AND SIMULATION METHOD OF THE TWIN SCREW
COMPRESSOR ………………………………………….....
15
3-1 Development Method for CFD Model .................................. 15
3-1-1 Suction Port ............................................................... 17
3-1-2 Discharge Port ........................................................... 20
3-2 Generation of 3-D Stator Model Automatically .................... 22
3-3 Mesh Generation …………………………………………... 23
3-3-1 Static Grid Generation …………………………….. 23
3-3-2 Dynamic Grid Generation ………………………..... 26
3-4 Numerical Simulation Method …………………………….. 29
3-5 Simulation Setup in CFX ………………………………….. 29
v
CHAPTER IV RESULT AND DISCUSSION ……………………………. 33
4-1 Model Mesh Statistic Comparison ………………………… 33
4-2 Calculation of Pressure Distribution Inside Working
Chamber ……………………………………………………
34
4-3 Calculation of the Mass Flow Rate ………………………... 36
4-4 Calculation of Pressure Distribution at Discharge Port …… 38
4-5 Calculation of Pressure Distribution at By Pass Channel … 39
CHAPTER V CONCLUSION AND FUTURE WORK………………….. 40
5-1 Conclusion ………………………………………………… 40
5-2 Future Work ………………………………………………. 41
REFERENCES ……………………………………………………………… 42
APPENDIXES ……………………………………………………………… 45

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指導教授

吳育仁(Yu-Ren Wu)

審核日期

2018-8-15

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