Parametric study on a compound-drop spray flame |
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| Authors: | Chung-Yao Hsuan Ta-Hui Lin |
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| Institution: | 1. Department of Mechanical Engineering , National Cheng Kung University , Tainan , Taiwan;2. Department of Mechanical Engineering , National Cheng Kung University , Tainan , Taiwan;3. Research Centre for Energy Technology and Strategy , National Cheng Kung University , Tainan , Taiwan |
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| Abstract: | The introduction of compound-drop spray in a combustion system is a new concept. These droplets bear two gasification stages to cause an integral positive or negative effect on a premixed flame to raise or lower the local temperature of the gasification region. In this paper, we adopt a compound drop which contains a water core encased by a layer of shell fuel. A one-dimensional homogeneous lean or rich premixed flame with the dilute compound-drop spray was investigated by using large activation energy asymptotic analysis. The compound-drop spray burning mode was defined and divided into completely pre-vaporised burning (CPB), shell pre-vaporised burning (SPB) and shell partially pre-vaporised (SPP) burning modes by way of the gasification zones of the shell fuel and the core water relative to the flame position. The influences of the initial droplet radius, the shell-fuel mass fraction and the liquid loading of the compound-drop spray on the lean and rich flames were analysed. By means of the normalisation parameter of flame propagation mass flux ( | |
| Keywords: | internal heat transfer compound-drop spray liquid loading shell-fuel mass fraction flame propagation mass flux initial radius |
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