特集—基礎燃焼とガソリンエンジン燃焼
乱流予混合火炎の局所火炎構造の解明とモデル化
キーワード:
Large eddy simulation,
Turbulent combustion model,
Direct numerical simulation,
Laser diagnostics
2016 年 58 巻 183 号 p. 33-40
詳細
2016 年 58 巻 183 号 p. 33-40
An increase in thermal efficiency of practical combustor is urgently demanded for the reduction of carbon dioxide emission. Numerical simulations, such as large eddy simulation (LES), are useful for rapid developments of next generation combustors, while the problems lie in that characteristics of turbulent combustion under high Karlovitz number conditions are not well understood and conventional turbulent combustion models are not validated in those conditions due to lack of data of fine experiments and direct numerical simulations. At the present, these challenges are resolved and turbulent combustion models are needed to be developed based on the turbulent combustion mechanism under high Karlovitz number conditions. This article reviews numerical simulation tools for LES and studies toward the understanding of local flame structure in turbulence. First, basic theories on flame structure of turbulent premixed combustion are introduced with a regime diagram of turbulent premixed combustion. Secondly, tools for LES and conventional turbulent combustion models are reviewed. Thirdly, numerical and empirical studies on local structure of turbulent premixed flame are reviewed with future requirements.
