【摘要】 利用激波管测量了2-甲基四氢呋喃（MTHF）在压力为0.12¹.00,MPa、温度为1,050¹,800,K、当量比为0.5².0及燃料摩尔分数为0.25%,¹.00%,下的滞燃期,结果表明:MTHF滞燃期随温度、压力和燃料摩尔分数的增大而减小,随当量比的增大而增加,并利用试验结果拟合出滞燃期随相关参数变化的阿累尼乌斯关系式;然后用两个机理（Kai机理和Luc机理）对滞燃期进行了模拟,其中Luc机理对滞燃期的预测明显偏低,而Kai机理与试验数据吻合较好,只是在低温浓混合气时预测值偏低,将其底层机理用NUI机理替换后高、低温情况下模拟值与试验值都能较好地吻合.敏感性分析显示,高温时对滞燃期影响最大的反应为H+O₂=O+OH,当温度降低时,该反应影响减少,而燃料裂解与脱氢反应对滞燃期的影响增大.路径分析显示,高温下MTHF的消耗以裂解反应为主,温度降低时,裂解反应对燃料消耗量的贡献率降低,而脱氢反应成为消耗燃料最主要的路径.更多还原

【Abstract】 Ignition delays of 2-methyltetrahydrofuran（MTHF）,covering pressures from 0.12 to 1.00 MPa,temperatures from 1,050 to 1,800 K,equivalence ratios from 0.5 to 2.0,and fuel concentrations of 0.25%,—1.00%,,were measured behind reflected shock wave,and an Arrhenius correlation was obtained according to the experimental data.Results showed that ignition delays of MTHF decrease with the increase of temperature,pressure and fuel concentration,and increase with the increase of equivalence ratio.Two chemical kinetic models（Kai mech and Luc mech）were used to make the simulations.Comparison of the prediction of ignition delays with the two mechanisms showed that,Luc mech underpredicts the ignition delays markedly and Kai mech can well predict the ignition delays of MTHF at most conditions except it underpredict the rich mixtures at low temperatures around 1,250,K.With the replacement of the base mechanism of Kai mech by NUI mechanism,a new mechanism was proposed and it can well predict the ignition delays of MTHF under all conditions both at high temperatures and low temperatures.Sensitivity analysis showed that the most important reaction determining the ignition delays of MTHF at high temperatures is H+O₂=O+OH.As temperature is decreased,the influence of this reaction is decreased and the reactions involving fuel decomposition and H-abstraction play more important roles in the auto-ignition of MTHF.Pathway analysis showed that MTHF is mainly consumed through the decomposition at high temperatures.As temperature is decreased,the contribution of fuel decomposition reactions decreases and H-abstraction reactions become the main pathways to consume the MTHF.更多还原