Numerical Investigation on the Performance of Spark Ignition Engine Used for Electricity Production Fuelled by Natural Gas/Liquefied Petroleum Gas-Biogas Blends with Modelica

摘要

Since the physical and chemical characteristics of biogas, some problems will occur in its applications in engine. The biogas engine and its performance parameters analysis is regarded as research object, the biogas engine model library was built based on the object-oriented language Modelica. The effect of compression ratio, ignition advance angle and the combustion duration on the performance of biogas engine was analyzed through simulation study. The optimization of operating parameters and design parameters of biogas engine was performed. Natural gas (33%, 67% and 100%) and liquefied petroleum gas (5%, 10% and 15%) were added to the biogas and were simulated as the fuel of SI engine. The effects of natural gas/liquefied petroleum gas-biogas blends on the performance of spark-ignition engine used for electricity production were numerical investigated. The results suggest that: There is an improvement in brake thermal efficiency and brake power with the addition of natural gas/liquefied petroleum gas in biogas. The feature of reusable and object-oriented of Modelica will enhance the modeling and simulation of biogas engine performance greatly not only in accuracy but simulation efficiency, this would be efficient for the theoretical design and the optimum work of the biogas fuelled engine.