2022 Fiscal Year Final Research Report
Ignition and combustion mechanism elucidation and modeling of combustion gases ejected from the pre-chamber in gas engines
| Project/Area Number |
20K04940
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 24020:Marine engineering-related
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| Research Institution | Okayama University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 燃焼 / 熱機関 / 分光計測 / 燃焼CFD / 副室式ガスエンジン |
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| Outline of Final Research Achievements |
Based on the results of fuel/air mixture measurements near the spark plug inside the pre-chamber, the ignition characteristics and the combustion mechanism of burned gas jet from the pre-chamber inside the main chamber were investigated with a high-speed visualization and analyzed by 3-D CFD using Large Eddy Simulation (LES) turbulent model with the detailed chemical kinetics. SIBS measurements around the spark plug inside the pre-chamber gas engine showed that the combustion gas jet is ejected earliest under the stoichiometric mixture around the spark plug, and therefore the combustion timing inside the main chamber becomes earlier. The numerical analysis method combining LES and detailed chemical reaction mechanisms was used to analyze the flame structure of the burned gas jet from the pre-chamber using the chemical species including intermediate products.
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| Free Research Field |
舶用海洋工学
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| Academic Significance and Societal Importance of the Research Achievements |
熱機関においては，天然ガス，バイオガス，水素などのガス燃料の利用はますます盛んになると考えている．このようなガスを主燃料とする種々の中・小型熱機関における熱効率向上のための基礎研究としての高い雰囲気圧力・温度におけるガス燃料の着火・燃焼メカニズムの詳細な把握が必要である．熱効率向上のためには，着火・燃焼という観点からは，どのような燃焼形態が最適であるかを見極める必要がある．いままで詳細なメカニズムが不明であった副室式ガスエンジンにおける副室内混合気への着火特性および副室から噴出される燃焼ガスジェット流の形成過程を明らかにし，モデル化することが本研究の目的である．
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