Effects of Ignition Timing and Compression Ratio on Performance of GDI Engines

2022 Muthanna International Conference on Engineering Science and Technology (MICEST) Pub Date : 2022-03-16 DOI:10.1109/micest54286.2022.9790238

M. Aldhaidhawi, Oras Khudhayer Obayes, Mina M. Aljuboury

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Abstract

The influence of different ignition timings and compression ratios on the combustion characteristics and performance of a gasoline direct injection GDI engine operating on gasoline and liquefied petroleum gas (LPG) fuels at a constant speed of 3000 rpm were numerically investigated. For this reason, a model was created and developed using the AVL Boost program (fully integrated IC engine simulation software). The results of this study showed that the effective power and effective torque were decreased for engines fueled with LPG compared to those of gasoline for all selected ignition timings. Also, brake specific fuel consumption was higher for LPG fuel than for gasoline fuel, but brake mean effective pressure, maximum cylinder pressure, and maximum cylinder temperature were higher for gasoline fuel than for LPG fuel. Increasing the compression ratios resulted in an increase in the effective power, effective torque, brake mean effective pressure, peak cylinder pressure, and peak cylinder temperature, but it also resulted in a decrease in the specific fuel consumption for both fuels.

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点火正时和压缩比对直喷发动机性能的影响

以汽油和液化石油气为燃料的汽油直喷直喷式直喷发动机为研究对象，研究了不同点火正时和压缩比对发动机燃烧特性和性能的影响。因此，使用AVL Boost程序(完全集成的集成电路发动机仿真软件)创建和开发了一个模型。研究结果表明，与汽油发动机相比，LPG发动机在所有点火时间内的有效功率和有效扭矩都有所降低。此外，LPG燃料的制动比油耗高于汽油燃料，但汽油燃料的制动平均有效压力、最大气缸压力和最高气缸温度高于LPG燃料。压缩比的增加导致有效功率、有效扭矩、制动平均有效压力、峰值气缸压力和峰值气缸温度的增加，但也导致两种燃料的比油耗降低。

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2022 Muthanna International Conference on Engineering Science and Technology (MICEST)

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