高负荷条件下使用汽油/乙醇混合燃料的柔性燃料预室混合控制燃烧(PC-MCC)特性分析

J. Zeman, Adam Dempsey
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引用次数: 0

摘要

本数值研究的重点是在约 18 巴制动平均有效压力 (BMEP) 和 2200 转/分钟的转速条件下,使用体积分数为 10% 的乙醇汽油混合物 (E10) 和纯乙醇 (E100) 进行前腔混合控制燃烧 (PC-MCC) 的特性分析。使用 CONVERGE 对 Caterpillar C9.3B 单缸发动机的原装和改装前腔进行了计算流体动力学(CFD)模拟。评估了火花正时时的前腔等效比、前腔火花正时提前量和主腔喷射策略对点火辅助性能的影响,以及在相同边界条件下相对于柴油基线的排放特性。模拟结果表明,PC-MCC 具有柔性燃料功能,在所考虑的工作条件下,对于 E10 和 E100 均能良好运行。结果表明,使用先导-主喷射策略可使前腔中的火花定时提前,从而降低火花塞点火压力,同时保持强劲的点火辅助功能。结果还表明,富前置腔操作有利于提高点火辅助能力。这项研究结果表明,使用 PC-MCC 发动机的重型车辆可以使用任何汽油和乙醇混合燃料,甚至包括纯乙醇,与柴油发动机相比,性能不会有太大的损失。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterization of Flex-Fuel Prechamber Enabled Mixing-Controlled Combustion (PC-MCC) with Gasoline/Ethanol Blends at High Load
This numerical study focuses on the characterization of prechamber enabled mixing-controlled combustion (PC-MCC) at ~18 bar brake mean effective pressure (BMEP) and 2200 rpm with 10% by volume ethanol-gasoline blend (E10) and pure ethanol (E100). Computational fluid dynamic (CFD) simulations of a stock and prechamber retrofitted single-cylinder Caterpillar C9.3B are carried out using CONVERGE. Prechamber equivalence ratio at spark timing, prechamber spark timing advance, and main chamber injection strategy are assessed with respect to their impact on ignition assistance performance and emissions characteristics relative to a diesel baseline at the same boundary conditions. Simulation results indicate that PC-MCC is flex-fuel capable and operates well for both E10 and E100 at the operating conditions considered. The results demonstrate that the use of a pilot-main injection strategy enables spark timing in the prechamber to be advanced and thus reduce spark plug firing pressure while maintaining robust ignition assistance. Results also indicate that the rich prechamber operation is favored for improved ignition assistance capabilities. The findings of this work suggest that a heavy-duty vehicle using a PC-MCC engine can utilize any blend of gasoline and ethanol, up to including pure ethanol, with no major sacrifices in performance relative to the diesel engine.
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