【作者】 陶涛； 杨斌； 罗忠敬；

【Author】 Tao Tao;Bin Yang;Chung K.Law;Center for Combustion Energy, and Department of Thermal Engineering, Tsinghua University;

【机构】 清华大学燃烧与能源中心和热能工程系；

【摘要】 异丁烯是支链烷烃(比如异辛烷)和一些含氧有机物(比如异丁醇)在热解和氧化过程中的一个重要中间产物。所以在构建上述燃料的燃烧动力学模型时,需要一个准确可靠的异丁烯热解和氧化子机理。为了验证异丁烯子模型的可靠性,就必然需要在一个较宽的实验范围内进行实验对比验证。在本研究中,利用分子束质谱结合单光子同步辐射光电离的手段,测量了在当量比为1.6、压力为30torr的条件下,异丁烯的层流预混火焰的火焰结构,得到了反应物、产物以及一些经过鉴定的稳定及活泼中间产物的摩尔分数曲线。主要的研究目标有以下三点:1、提供异丁烯层流预混火焰的分子束质谱实验结果。2、利用新得到实验数据中的各组份的浓度分布对USC MechⅡ模型进行对比验证。3、对USC MechⅡ模型进行一些必要的修改,提高其预测的准确性。更多还原

【Abstract】 Isobutene is an important intermediate of the pyrolysis and oxidation of branched alkanes such as iso-octane and is also produced significantly from the oxidation of some oxygenates including isobutanol, etc. Therefore, kinetic modeling in the combustion of these fuels requires a reliable chemical kinetic submodel for the pyrolysis and oxidation of isobutene. Especially, the increasing interests shown to the combustion of isobutanol, which is proposed as a promising alternative biofuel, attracts more attentions to the isobutene combustion. Kinetic modeling of isobutanol combustion requires a reliable chemical kinetic submodel for the pyrolysis and oxidation of isobutene. To establish the validity of a base model, validation tests need to be performed for the oxidation of isobutene against a wide range of experimental observations. In this study, the new premixed laminar flame structure for isobutene at fuel rich(phi = 1.60) condition is determined at low pressure(30 torr) by flame-sampling molecular-beam mass spectrometry(MBMS) in combination with single-photon synchrotron ionization. The results consist of mole fraction profiles of reactants, products and the well-identified stable and reactive intermediates. The goals of this work are to: 1. provide a new set of burner stabilized premixed flame data for isobutene by MBMS measurement; 2. test the USC Mech II against the new species profiles in laminar premixed flames; 3. make necessary changes to USC Mech II to achieve better predictive capabilities.更多还原