研究生: |
羅麥可 Michael - Estela Loretero |
---|---|
論文名稱: |
聲波激勵對旋轉燃燒尾流的效應 Effects of Acoustic Excitation on a Reacting and Swirling Wake |
指導教授: |
黃榮芳
Rong-Fung Huang |
口試委員: |
趙振綱
Ching-Kong Chao 楊鏡堂 Jing-Tang Yang 牛仰堯 Yang-Yao Niu 沈澄宇 Cherng-Yeu Shen 孫珍理 Chen-Li Sun |
學位類別: |
博士 Doctor |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2011 |
畢業學年度: | 99 |
語文別: | 英文 |
論文頁數: | 277 |
中文關鍵詞: | Reacting swirling wake 、Acoustic excitation 、Nonpremixed flame |
外文關鍵詞: | Reacting swirling wake, Acoustic excitation, Nonpremixed flame |
相關次數: | 點閱:478 下載:4 |
分享至: |
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The present work aims to investigate experimentally the behavior of flame and
flow at swirling wake when the fuel supply is acoustically driven. Excitation frequency,excitation amplitude, central jet flow and annular jet flow are successively varied. Fourdistinctive flame behaviors are generated and classified as wrinkled base flame,converged base flame, diverged base flame, and blue lifted flame. These effects are particularly strong when the excitation frequency is tuned close to 180 Hz and its harmonic frequencies due to fuel tube resonance. The flame lengths at various excitation amplitude, central jet flow and annular jet flow are measured using conventional flame photography technique. The central jet flow approach optimal condition at Rec = 2386 based on the flame reduction capacity of the acoustic generator. Laser-light sheet assisted Mie scattering method is employed to visualize the flow in the flame. The beads like vortex in the central jet induced a wrinkled base flame and when the excitation increases the beads like structure expand resulting to a converged base flame. The upward rolling vortex causes the diverged base flame while the periodically issuing fuel jet puts the flame into its blue lifted flame mode. Jet exit velocity fluctuations are measured by two components LDV to calculate the flow and turbulence properties. Optimum mixing condition is found at Rea = 528 and excitation level between 8 to 12 volts based on the Lagrangian integral length scale. The flow field characteristic at optimal condition is diagnosed by high speed PIV system to quantify the flow and turbulence properties in every phase of the acoustic cycle. Flame temperature is measured by Type-R thermocouple which describes a large heat release of the flame at optimal conditions. At such condition, faster rate of reaction is verified by concentration measurements of the products of combustion carried out using Rosemount gas analyzer.
The present work aims to investigate experimentally the behavior of flame and
flow at swirling wake when the fuel supply is acoustically driven. Excitation frequency,excitation amplitude, central jet flow and annular jet flow are successively varied. Fourdistinctive flame behaviors are generated and classified as wrinkled base flame,converged base flame, diverged base flame, and blue lifted flame. These effects are particularly strong when the excitation frequency is tuned close to 180 Hz and its harmonic frequencies due to fuel tube resonance. The flame lengths at various excitation amplitude, central jet flow and annular jet flow are measured using conventional flame photography technique. The central jet flow approach optimal condition at Rec = 2386 based on the flame reduction capacity of the acoustic generator. Laser-light sheet assisted Mie scattering method is employed to visualize the flow in the flame. The beads like vortex in the central jet induced a wrinkled base flame and when the excitation increases the beads like structure expand resulting to a converged base flame. The upward rolling vortex causes the diverged base flame while the periodically issuing fuel jet puts the flame into its blue lifted flame mode. Jet exit velocity fluctuations are measured by two components LDV to calculate the flow and turbulence properties. Optimum mixing condition is found at Rea = 528 and excitation level between 8 to 12 volts based on the Lagrangian integral length scale. The flow field characteristic at optimal condition is diagnosed by high speed PIV system to quantify the flow and turbulence properties in every phase of the acoustic cycle. Flame temperature is measured by Type-R thermocouple which describes a large heat release of the flame at optimal conditions. At such condition, faster rate of reaction is verified by concentration measurements of the products of combustion carried out using Rosemount gas analyzer.
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