李素芬

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:女

毕业院校:大连理工大学

学位:硕士

所在单位:能源与动力学院

办公地点:能源与动力学院718室

联系方式:13084159090

电子邮箱:lisuf@dlut.edu.cn

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Investigation of Pressure Effect on Thermal Cracking of n-Decane at Supercritical Pressures

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论文类型:期刊论文

发表时间:2018-03-01

发表刊物:ENERGY & FUELS

收录刊物:SCIE、EI

卷号:32

期号:3

页面范围:4040-4048

ISSN号:0887-0624

摘要:Regenerative cooling utilizing on-board endothermic hydrocarbon fuels of the high-temperature components of the scramjet engine plays a paramount role in maintaining the reliability and durability of the systems. A molecular kinetic model was proposed by modifying the Kumar-Kunzru kinetic model to describe the thermal cracking of n-decane at supercritical pressures. The apparent kinetic parameters at different pressures were optimized by the Levenberg-Marquardt algorithm. After the model validation, the role of pressure on the chemical heat absorption rate during n-decane pyrolysis was investigated using the one-dimensional plug flow model. It was found that the heat absorption rate first increases and then slightly decreases as the temperature increases at all pressures. The highest chemical heat absorption rate is located at a conversion of 41.81%, 53.34%, and 59.40% at 3, 4, and 5 MPa. In addition, the effect of pressure on n-decane pyrolysis was quantitated using the equivalence temperature. Under the simulation conditions considered in the present study, each 1 MPa increase in pressure produced the same conversion as a temperature decrease of 6.5-10 K. Finally, in order to extrapolate the kinetic model to a wider range of pressure conditions, a model extrapolation method based on the activation volume was proposed.