液滴自点火延迟的简化模型
首发时间:2008-06-11
摘要:燃料液滴突然进入高温空气环境中,会发生自点火延迟现象。本文通过分析当量比等于1的气体微团升温及反应历程,给出了一种确定液滴自点火延迟时间的简化模型,明确地区分了液滴点火延迟的物理和化学因素,可以较好的预测液滴自点火过程,给出与实验及数值模拟相当的自点火延迟时间。本文还利用此简化模型,详细地分析了液滴大小对自点火延迟的影响。
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A Simple Model on Droplet Ignition Delay Time
Abstract:When a droplet is suddenly injected into high temperature environment, droplet ignition delay phenomenon occurs. A simple model to predict the droplet ignition delay time is developed in this paper, based on the temperature history of gas mixture with equivalence ratio equal to 1. This simple model clearly divides the ignition delay into two parts: physical delay and chemical delay. And the predicted droplets ignition times agree well with experimental data and numerical simulation results. With this model, the influence of droplet diameter on ignition delay has been discussed in detail.
Keywords: fuel droplet, ignition delay time, droplet diameter
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No.2215020605012131****
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