学术
摘 要:
基于瞬态气液相控制方程，建立了超临界工况下二甲醚（DME）蒸发的数学模型，并进行了数值求解．详细考虑了高压下的非理想气体效应、液滴表面热动力相平衡、环境气体的可溶性、流体热物性的高压修正以及Somt和Dufour耦合效应等．计算结果表明，高压下气体溶解显著增强，相变焓明显偏离蒸发潜热，d^2律已不能准确描述液滴蒸发现象，液滴表面温度一直处于上升状态，甚至可以达到临界点；而且，随着压力的上升，耦合效应对蒸发的影响逐渐增强．[著者文摘]
文章出处:
《燃烧科学与技术》-2007年13卷5期 -468-473页
分 类 号:
文献标识码:
A
文章编号:
1006-8740（2007）05-0468-06
Numerical Simulation on DME Droplet Evaporation in Supercritical Condition
ZHAO Wei-dong, WEI Ming-rui, KONG Hang, LIU Fei, WO Ao-bo （ School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China ）
Abstract:
A comprehensive analysis of dimethyl ether droplet evaporation at the high pressure and temperature environment was made. The model was based on complete time dependent conservation equation, with a fidl account of variable properties and vapor liquid interface thermodynamics. The influence of various high phenomena including ambient gas solubiity, property variation and thermodynamic non-ideality on the mechanism were examined systemically. The results indicate that the ambient gas pressure has a profound impact on the evaporation process, and d^2 law behavior becomes invalid and the droplets can reach their critical points in a totally transient process. Coupled diffusion processes were also studied and found to be an important factor in high pressure droplet evaporation.[著者文摘]
Key words:
dimethyl ether （DME）; numerical simulation; evaporation; supercritical
基金资助:
国家自然科学基金资助项目（50376018）;国家重点基础研究发展计划（973）资助项目（2001CB209207）.
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