基于氢气/柴油RCCI的热效率与?损失联合优化

Combined optimization of thermal efficiency and exergy destruction for hydrogen/diesel reactivity controlled compression ignition (RCCI) combustion

中文关键词: 热力学第二定律  ?损失  氢气/柴油反应活性控制压燃（RCCI）燃烧  优化

英文关键词: The second law of thermodynamics  Exergy destruction  Hydrogen/diesel reactivity controlled compression ignition (RCCI) combustion  Optimization

中文摘要:

      本文通过将KIVA-3V程序与非支配排序遗传算法（NSGA-II）耦合，对氢气/柴油反应活性控制压燃（RCCI）燃烧的七个关键运行参数进行了优化。优化的目标为同时实现等效指示燃油消耗率（EISFC）与?损失的最小化，从而在热力学第一定律与第二定律层面同时实现最优，并且确定了不同初始参数对?损失的影响规律及原因。结果表明，由于EISFC随着燃烧温度非单调性变化，导致EISFC和?损失之间呈现明显的trade-off关系，所以很难同时实现EISFC和?损失的最小化。由于化学反应路径、燃烧温度与燃烧持续期对?损失的影响，提高预混能量比与第一次喷射占比可以有效降低?损失。

英文摘要:

      In this study, seven key operating parameters were optimized for hydrogen/diesel reactivity controlled compression ignition (RCCI) combustion by coupling the KIVA-3V code with the non-dominated sorting genetic algorithm-II (NSGA-II). The goal of optimization is to minimize both equivalent indicated specific fuel consumption (EISFC) and exergy destruction, so that the optimization in terms of both the first law and the second law of thermodynamics can be achieved at the same time. Then, the influence law and causes of different initial parameters on exergy destruction are determined. The results indicate that EISFC and exergy destruction show an obvious trade-off relationship, which means that it is difficult to minimize EISFC and exergy destruction simultaneously. This is due to the nonmonotonic variation of EISFC with the combustion temperature. Due to the influence of chemical reaction path, combustion temperature and combustion duration on exergy destruction, increasing the premixed energy ratio and the proportion of first injection can reduce exergy destruction.