扩散界面法研究正十二烷液体燃料的跨临界混合与自燃
Transcritical Mixing and Auto-Ignition of n-dodecane Liquid Fuel using a Diffused Interface Method
摘要：
采用最近开发的有限速率大涡模拟器，在高温高压条件下对炉膛内的跨临界喷雾混合和自燃进行了高保真模拟。模拟框架是基于扩散界面（DI）方法，该方法解决了可压缩多物种守恒方程以及彭罗宾逊状态方程和真实流体输运性质。采用有限体积法和熵稳定格式，对非线性真实流体流动进行了精确模拟。LES分析是针对非反应和反应喷雾条件下的ECN喷雾A配置，在腔室条件下的压力为60巴，温度在800 K和1200 K之间，以研究实际流体环境和低温化学的影响。在全球喷雾参数和混合物分数分布方面的测量结果的比较表明，在建模的湍流混合行为的准确性。良好的整体协议的自燃过程中获得的模拟结果在不同的环境温度条件下，中间物种的形成被捕获的模拟，表明所提出的数值框架充分再现了相应的低和高温点火过程在高压条件下，是相关的现实柴油燃料喷射系统。
英文摘要：
High-fidelity simulations of transcritical spray mixing and auto ignition in a combustion chamber are performed at high pressure and temperature conditions using a recently developed finite rate LES solver. The simulation framework is based on a diffused-interface (DI) method that solves the compressible multi-species conservation equations along with the Peng Robinson state equation and real-fluid transport properties. A finite volume approach with entropy stable scheme is employed to accurate simulate the non-linear real fluid flow. LES analysis is performed for non-reacting and reacting spray conditions targeting the ECN Spray A configuration at chamber conditions with a pressure of 60 bar and temperatures between 800 K and 1200 K to investigate effects of the real-fluid environment and low-temperature chemistry. Comparisons with measurements in terms of global spray parameters and mixture fraction distributions demonstrates the accuracy in modeling the turbulent mixing behavior. Good overall agreement of the auto-ignition process is obtained from simulation results at different ambient temperature conditions and the formation of intermediate species is captured by the simulations, indicating that the presented numerical framework adequately reproduces the corresponding low-and-high-temperature ignition processes under high-pressure conditions that are relevant to realistic diesel fuel injection systems.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
