CO_2稀釋對(duì)甲烷高溫低氧條件下自燃著火特性影響的數(shù)值模擬(英文)

【摘要】：Homogeneous mixtures of CH4/air under moderate or intense low-oxygen dilution(MILD) combustion conditions were numerically studied to clarify the fundamental effects of exhaust gas recirculation(EGR),espe-cially CO2 in EGR gases,on ignition characteristics.Specifically,effects of CO2 addition on autoignition delay time were emphasized at temperature between 1200 K and 1600 K for a wide range of the lean-to-rich equivalence ratio(0.2~2).The results showed that the ignition delay time increased with equivalence ratio or CO2 dilution ratio.Fur-thermore,ignition delay time was seen to be exponentially related with the reciprocal of initial temperature.Special concern was given to the chemical effects of CO2 on the ignition delay time.The enhancement of ignition delay time with CO2 addition can be mainly ascribed to the decrease of H,O and OH radicals.The predictions of tem-perature profiles and mole fractions of CO and CO2 were strongly related to the chemical effects of CO2.A single ignition time correlation was obtained in form of Arrhenius-type for the entire range of conditions as a function of temperature,CH4 mole fraction and O2 mole fraction.This correlation could successfully capture the complex be-haviors of ignition of CH4/air/CO2 mixture.The results can be applied to MILD combustion as "reference time",for example,to predict ignition delay time in turbulent reacting flow. 【作者單位】： College
【關(guān)鍵詞】： moderate or intense low-oxygen dilution combustion ignition delay time autoignition methane
【基金】：Supported by the National Natural Science Foundation of China (50206014) the Shuguang Scholar Program of Shanghai Education Development Foundation (05SG23)
【分類(lèi)號(hào)】：X928.7
【正文快照】： 1 INTRODUCTIonDue to the increasing concern about sustainabil-ity and climate change, the improvement of energyutilization efficiency to reduce fossil fuel consumptionand pollutant emission is an important issue in thefield of combustion science. In rece

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