柴油机跨临界喷油过程的建模与仿真
Modeling and Simulation of Diesel Injection at Transcritical Conditions
摘要：
对提高发动机效率的需求促使了高压燃烧系统的发展，在高压燃烧系统中，操作条件达到并超过临界条件。与这些条件相关联的是大的热力学梯度和当流体经历混合和相变时输送性质的强烈变化。准确模拟这些真实流体环境仍然是一个主要挑战。采用了不同的建模方法，可以分为扩散界面方法和尖锐界面方法。本研究的目的是研究扩散界面法模拟柴油喷射在相关的条件下的超临界政权。为此，最近开发的跨临界条件下的可压缩真实流体求解器。一个ECN相关的柴油机喷油器的模拟和预测的瞬时和统计流场的结果进行了比较，与现有的测量。预计从这个分析的结果将是有用的，在确定目前的建模技术的局限性，并在改善高压注入系统的物理和数值模型。
英文摘要：
The need for improved engine efficiencies has motivated the development of high-pressure combustion systems, in which operating conditions achieve and exceed critical conditions. Associated with these conditions are large thermodynamic gradients and strong variations in transport properties as the fluid undergoes mixing and phase transition. Accurately simulating these real-fluid environments remains a main challenge. Different modeling approaches have been employed, which can be categorized as diffused and sharp interface methods. The objective of this study is to examine the diffused interface method for simulating diesel-fuel injection at conditions related to the supercritical regime. To this end, a recently developed compressible real-fluid solver for transcritical conditions is employed. Simulations of an ECN-relevant diesel-fuel injector are performed and predictions for instantaneous and statistical flow-field results are compared against available measurements. It is expected that results from this analysis will be useful in identifying limitations of current modeling techniques and in improving physical and numerical models for high-pressure injection systems.
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