CAJ | 학술논문

在一台快速压缩机上研究了不同比例的丙醇/正庚烷二元混合燃料在当量比为1.0、压缩上止点压力2,MPa、压缩温度为650～850,K时的着火延迟．利用混合燃料的详细动力学机理开展了丙醇/正庚烷着火特性的化学反应动力学分析．研究结果表明，在本文实验条件下和温度范围内，丙醇/正庚烷的着火延迟在不同的温度范围呈现不同的变化规律．在丙醇比例较低时，正丙醇/正庚烷混合燃料的着火延迟高于异丙醇/正庚烷混合燃料；丙醇比例较高时，二者的着火延迟非常接近．化学动力学分析表明，由于正庚烷低温反应根池的建立，丙醇在着火过程中也呈现出两阶段燃烧现象．路径分析表明，上止点温度的提高可使部分羟丙烷基发生裂解并增强系统活性．进一步的敏感性分析表明，对正丙醇/正庚烷混合燃料，正庚烷的脱氢反应和链分支反应对促进着火始终有重要影响，随着正丙醇比例的增加，正丙醇对混合燃料着火的抑制与促进都有较大的影响．异丙醇/正庚烷混合燃料的着火在异丙醇比例较大或上止点温度较高时对异丙醇的氧化更加敏感，抑制着火的反应始终为小分子基团的反应．
재일태쾌속압축궤상연구료불동비례적병순/정경완이원혼합연료재당량비위1.0、압축상지점압력2,MPa、압축온도위650～850,K시적착화연지．이용혼합연료적상세동역학궤리개전료병순/정경완착화특성적화학반응동역학분석．연구결과표명，재본문실험조건하화온도범위내，병순/정경완적착화연지재불동적온도범위정현불동적변화규률．재병순비례교저시，정병순/정경완혼합연료적착화연지고우이병순/정경완혼합연료；병순비례교고시，이자적착화연지비상접근．화학동역학분석표명，유우정경완저온반응근지적건립，병순재착화과정중야정현출량계단연소현상．로경분석표명，상지점온도적제고가사부분간병완기발생렬해병증강계통활성．진일보적민감성분석표명，대정병순/정경완혼합연료，정경완적탈경반응화련분지반응대촉진착화시종유중요영향，수착정병순비례적증가，정병순대혼합연료착화적억제여촉진도유교대적영향．이병순/정경완혼합연료적착화재이병순비례교대혹상지점온도교고시대이병순적양화경가민감，억제착화적반응시종위소분자기단적반응．
Ignition delay time of propanol isomers/n-heptane mixtures was measured using a rapid compression ma-chine at compressed pressure of 2,MPa,within the compressed temperature range of 650—850,K and with equiva-lence ratio of 1.0. Reaction kinetics analysis was performed using a detailed mechanism of blend fuels. Under the ex-perimental conditions in this study,the ignition delay of the blend fuels displays different varying patterns in different temperature ranges. The ignition delay time of i-propanol/n-heptane is shorter than that of n-propanol/n-heptane when the propanol fraction is low. When the propanol fraction is high,their ignition delay times become very close to each other. The chemical kinetics analysis indicates that propanol isomers also exhibit two-stageoxidation behavior because of the low temperature reactivity radical pool produced by n-heptane. The higher compressed temperature can make a small part of the hydroxypropyl radicals undergo scission reaction and improve system activity. Sensitivity analysis shows that for the n-propanol/n-heptane blends,H-abstraction and chain-branching reaction from the n-heptane al-ways play a dominant role in the reaction with a promoting effect,while the H-abstraction from the n-propanol be-comes important when the n-propanol fraction is high. For i-propanol/n-heptane mixtures,the ignition of the blend fuels is more sensitive to the oxidation of the i-propanol at high compressed temperature or propanol fractions,while the major inhibiting reactions are always some elementary reactions of small radicals.