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| ???org.dspace.app.webui.jsptag.ItemTag.dcfield??? | Value | Language |
|---|---|---|
| dc.contributor.advisor | 趙修武 | zh_TW |
| dc.contributor.advisor | Shiu-Wu Chau | en |
| dc.contributor.author | 邱勝瑄 | zh_TW |
| dc.contributor.author | Sheng-Hsuan Chiu | en |
| dc.date.accessioned | 2022-11-23T08:58:14Z | - |
| dc.date.available | 2024-05-30 | - |
| dc.date.copyright | 2021-11-04 | - |
| dc.date.issued | 2021 | - |
| dc.date.submitted | 2002-01-01 | - |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/79329 | - |
| dc.description.abstract | 本研究使用有限體積法離散基於連續方程式、動量方程式、能量方程式、電磁場方程式及SST k-ω紊流模型的磁流體動力方程組，建立非傳輸型井式直流電漿火炬的三維暫態數學模型，並開發流場分析程式碼。本研究的火炬長690 mm，火炬半徑11 mm，模擬分析工作壓力為1大氣壓條件下，流量範圍為100 SLM至200 SLM間以及工作電流為100 A至200 A 間的空氣電漿火炬特性，並假定陰極弧根以1000 Hz頻率環繞火炬內壁移動。本研究利用迴歸分析計算結果顯示電弧長度正比於工作電流的-1.008次方以及入流流量的0.295次方；出口平均軸向速度正比於工作電流的-0.754次方以及入流流量的1.691次方；出口平均旋向速度正比於工作電流的-2.061次方以及入流流量的3.491次方；出口平均溫度正比於工作電流的-0.415次方以及入流流量的0.427次方。 | zh_TW |
| dc.description.abstract | This study develops a numerical framework where a finite volume method is used to discretize the MHD equations consisting of the continuity, momentum, energy, Maxwell's equations and the SST k-ω turbulence model. A three-dimensional unsteady model is established to simulate a non-transferred direct-current plasma torch equipped with well-type cathode. The investigated torch has a length of 690 mm and a radius of 11 mm. The plasma torch flow is calculated at an inlet flow rate ranging from 100 SLM to 200 SLM and a working current ranging from 100 A to 200 A. The working pressure is 1 atm where the cathode spot is assumed to have a circulation frequency of 1000 Hz. With the help of a regression analysis, the arc length is predicted to grow with I^(-1.008) and Q^0.295; the mean axial velocity at the outlet is predicted to grow with I^(-0.754) and Q^1.691; the mean tangential velocity at the outlet is predicted to grow with I^(-2.061) and Q^3.491; the mean temperature at the outlet is predicted to grow with I^(-0.415) and Q^0.427. | en |
| dc.description.provenance | Made available in DSpace on 2022-11-23T08:58:14Z (GMT). No. of bitstreams: 1 U0001-2710202110133000.pdf: 8638523 bytes, checksum: 7c3247665ff7f6cfc3b97a82367da8cd (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | Contents
Nomenclature v Acronyms v Latin Symbols vi Greek Symbols xi List of Figures xiii List of Tables xvii Chapter 1 Introduction 1 Chapter 2 Method 7 2-1 Governing Equations 7 2-1-1 Magnetohydrodynamic Equations 7 2-1-2 Boundary Conditions 11 (a) Inlet 11 (b) Outlet 11 (c) Wall 12 (d) Symmetry Plane 13 (e) Cathode 13 (f) Anode 14 2-2 Numerical Method 16 2-2-1 Finite Volume Method 16 (a) Transient Term 18 (b) Convection Term 18 (c) Diffusion Term 19 2-2-2 Pressure-correction Equation 21 2-2-3 Wall Distance Calculation 24 2-2-4 Solution Procedure 25 Chapter 3 Study Case 29 3-1 Description of Experiment 29 3-2 Case Description 30 3-3 Computational Domain and Boundary Conditions 31 (a) Cathode 34 (b) Anode 35 3-4 Plasma Properties 38 3-5 Mesh 41 3-6 Grid Dependency 44 Chapter 4 Result and Discussion 48 4-1 Validation 48 4-2 Working Current 52 4-2-1 Time-Averaged Analysis 52 4-2-2 Time History Analysis 62 4-3 Inlet Flow Rate 71 4-3-1 Time-Averaged Analysis 71 4-3-2 Time History Analysis 80 4-4 Discussion 86 Chapter 5 Conclusions and Future Works 95 Appendix 97 References 99 | - |
| dc.language.iso | zh_TW | - |
| dc.subject | 直流電漿火炬 | zh_TW |
| dc.subject | 暫態 | zh_TW |
| dc.subject | 三維 | zh_TW |
| dc.subject | 磁流體模型 | zh_TW |
| dc.subject | 空氣電漿 | zh_TW |
| dc.subject | 井式陰極 | zh_TW |
| dc.subject | WTC | en |
| dc.subject | DC Plasma Torch | en |
| dc.subject | Air Plasma | en |
| dc.subject | Magnetohydrodynamic Model | en |
| dc.subject | Three-dimensional | en |
| dc.subject | Unsteady | en |
| dc.title | 三維暫態直流電漿火炬模擬 | zh_TW |
| dc.title | Three-Dimensional Unsteady Simulation of Direct Current Plasma Torch | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 109-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 吳宗信;陳孝輝;魏大欽;林洸銓;戴璽恆 | zh_TW |
| dc.contributor.oralexamcommittee | Zhong-Xing Wu;Xiao-Hui Chen;Ta-Chin Wei;Kuang C. Lin;Hsi-Heng Dai | en |
| dc.subject.keyword | 直流電漿火炬,井式陰極,空氣電漿,磁流體模型,三維,暫態, | zh_TW |
| dc.subject.keyword | DC Plasma Torch,WTC,Air Plasma,Magnetohydrodynamic Model,Three-dimensional,Unsteady, | en |
| dc.relation.page | 104 | - |
| dc.identifier.doi | 10.6342/NTU202104312 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2021-10-31 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 工程科學及海洋工程學系 | - |
| Appears in Collections: | 工程科學及海洋工程學系 | |
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| ntu-109-2.pdf | 10.92 MB | Adobe PDF | View/Open |
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