Department of Mechanical Engineering, Dr. B R Ambedkar National Institute of Technology, Jalandhar 144011, India.
Department of Mechanical Engineering, Rayat Bahra Institute of Engineering and Nano-Technology, Hoshiarpur- 146104, India.
Chaos. 2022 Apr;32(4):043107. doi: 10.1063/5.0080910.
Higher cyclic variability in combustion adversely influences emissions, efficiency, and driveability of internal combustion engines. In this paper, we used wavelet transform techniques to investigate the dynamical characteristics of a combustion process in numerous combustion parameters of a 4-cylinder turbocharged common rail direct injection (CRDI) diesel engine fuelled with Argemone mexicana biodiesel (AGB)/diesel blended fuel. In addition, statistical analysis is described to validate the results of the wavelet spectrum methods for cyclic variation in the diesel engine. The results show that the cyclic variations in IMEP and Pmax are sensitive to the engine load and fuel properties. The coefficient of variation of both combustion parameters decreases as engine load increases for all tested fuels. Moreover, adding Argemone mexicana biodiesel (AGB) into diesel fuel up to 20% (AB20) reduces cyclic variations in combustion parameters at all tested engine loads. Furthermore, the global wavelet spectrum and wavelet power spectrum are utilized to identify the dominant oscillatory combustion modes. The cycle-to-cycle fluctuations in combustion parameters (i.e., IMEP and Pmax) exhibit multi-scale dynamics for all experimental conditions. Compared to long and intermediate oscillations in diesel fuel, AB10 and AB20 fuel showed short and intermittent period fluctuations. The findings of this experimental work will be helpful to optimize engine control strategies for AGB/diesel blended fueled multi-cylinder CRDI diesel engines.
燃烧过程中的循环波动较大，会对内燃机的排放、效率和驾驶性能产生不利影响。本文使用小波变换技术研究了在 4 缸涡轮增压共轨直喷（CRDI）柴油机中，以 Argemone mexicana 生物柴油（AGB）/柴油混合燃料为燃料的众多燃烧参数的燃烧过程的动态特性。此外，还描述了统计分析，以验证用于柴油机循环变化的小波谱方法的结果。结果表明，IMEP 和 Pmax 的循环变化对发动机负荷和燃料特性敏感。对于所有测试燃料，随着发动机负荷的增加，这两个燃烧参数的变化系数都减小。此外，在所有测试的发动机负荷下，向柴油中添加高达 20%的 Argemone mexicana 生物柴油（AGB）（AB20）可降低燃烧参数的循环变化。此外，全局小波谱和小波功率谱用于识别主要的振荡燃烧模式。在所有实验条件下，燃烧参数（即 IMEP 和 Pmax）的循环波动表现出多尺度动力学。与柴油中的长周期和中间周期波动相比，AB10 和 AB20 燃料显示出短周期和间歇性波动。这项实验工作的结果将有助于优化 AGB/柴油混合燃料多缸 CRDI 柴油机的发动机控制策略。
