Numerical simulation study of diesel engine based on new type of crankshaft connecting rod mechanism

Abstract

Diesel engine works under mix combustion (constant volume and constant pressure) with low combustion rate and speed, resulting in its thermal efficiency is lower than the constant volume combustion type at the same compression rate. A diesel engine model with new type of crankshaft connecting rod mechanism which can stay in the TDC for a long time is developed to realize constant volume combustion. The kinematics and thermal simulation of the new engine is carried out by comparing with a 150 type diesel engine. The results indicated that the piston of the new engine could stay at the TDC for approximately 80 crank degrees which can prolong the combustion time at the same engine speed significantly.