A SIMULATION STUDY ON STRESS AND DEFORMATION ON PISTON OF A CONVERTED BIOGAS ENGINE

Abstract

This paper presents the simulation study results on the high-pressure cycle
of a biogas engine converted from a conventional diesel engine using dedicated
software. The original diesel engine was modified to reduce the compression
ratio to suit biogas fuel. The original engine's combustion chamber and
compression ratio were changed by modifying the piston crown to heron type.
Thermodynamic simulation software AVL Boost determined the parameters of
in-cylinder pressure and temperature. The results show that the in-cylinder
pressure decreased compared to diesel, 8.61MPa to 5.74MPa when using biogas
fuel. However, the incylinder temperature increased from 2175K to 2385K. The
effect of the mechanical and thermal load on the piston of the original engine
and converted one was simulated by the finite element method. The maximu
stress on piston head was 3.425x109N/m2 và 4.224x109N/m2 for the original and
converted engine.