| 翻訳と辞書 |
| Eddy break-up model for combustion ： ウィキペディア英語版 |
Eddy break-up model for combustion
The Eddy Break-Up Model is used in combustion engineering.
Combustion modeling is one of the most important topics in demand. Its wide range of applications has attracted the attentions of most of the researchers around the globe. In most of the combustion systems fuel and oxygen (or air) are separately supplied in the combustion chamber. Due to this chemical reaction and combustion occurs simultaneously in the combustion chamber. However, it is evident that the rate of the chemical reaction is faster than the rate of mixing fuel and oxygen. Which interprets that rate of combustion is controlled by rate of mixing. Such cases where formation of pre-mixture is difficult are called diffusion combustion or diffusion flames.
==Diffusion flames==
Diffusion flames can be laminar diffusion flames (e.g. Candles and matches burning in the air etc.) and turbulent diffusion flames (e.g. furnaces, turbo-machinery, some liquid-fuel rocket engines and internal combustion engines) depending on the nature of mixed gas flow. Further, the flame shapes of this kind of burning are divided into two categories oxygen-rich diffusion flames and oxygen-deficient. Flame shapes also depend on the discharging velocity of fuel and air. Eddies inside the air flow plays an important role in deciding the flame shapes. With increase in discharging velocity of fuel into the air laminar diffusion flames tends to become turbulent diffusion flames. This leads to an increase in the flame height and finally it gains a maximum height (critical limit). After this limit further increase in the jet velocity of the fuel adds to instability of turbulent flame. The position where laminar flame is changing into turbulent flame is termed as “break-up point”. Increase in jet velocity after critical limit results in decrease of the whole flame height. Beyond this point the height of the break-up point reaches a certain value where even after increasing the jet velocity of fuel the flame height will not change. Studies by Hawthorne et al. prove that the chemical reaction rates in turbulent diffusion flames and in laminar diffusion flames are almost similar.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Eddy break-up model for combustion」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|