Performance enhancement of SI engine through LIVC miller cycle approach with Producer gas-biogas blends: A simulation and optimization study

Abstract

There are many difficulties by using a sole renewable energy source. In this view, the current research intends to use producer gas (PG) and biogas (BG) blend in equal volume produced by waste biomass via gasification and anaerobic digestion. The purpose of this research is to enhance the performance and reduce the emissions of the SI engine. So, a comprehensive quasi-dimension thermodynamical model has been used to simulate the performance of SI engines with various input variables, such as late inlet valve closure timing (LIVC), start of ignition timing (SOI), and inlet pressure. This work is novel in using FORTRAN code to simulate the impact of LIVC, SOI, and inlet pressure on SI engine performance and emissions. Additionally, It seeks to ascertain the optimum operating parameters for the mordost responsive power, efficiency, fuel usage, and pollution limits. The response-surface methodology was used to optimize the operating and response parameters. Using an ANOVA-based regression model shows 95 % confidence level of accuracy. The optimum operating settings were found 60° aBDC-LIVC, 22.38° bTDC-SOI, and 2.5 bar intake pressure. Corresponding to these optimal inputs, the optimum response performance were found to be 5.10 kW, 28.78 %, 13.30 MJ/kWh, 0.439 (vol%), 1125.9 ppm for indicated power (IP), indicated thermal efficiency (ITE), brake specific energy consumption (BSEC), CO, and NO respectively, with a composite desirability of 0.841. According to the study's findings, modeling and optimization can be used to estimate the overall performance of SI engines that run on a blend of BG and PG fuel. © 2025 Elsevier Ltd