Air Flow and Camshaft Stress Analysis of Variable Valve Lift Gas Engine

Abstract

The use of variable valve lift technology on diesel gas engine has been able to increase power without having to change the dimensions of the engine. However, in-depth analysis of how the flows that occur when air enters and stress that occurs in camshaft of the gas engine needs to be studied more deeply. Simulation Analysis incoming airflow and stress on the gas engine camshaft variable valve lift types expected to describe the effect of the use of valve lift on the gas engine. In this simulation experiments using Computational Fluid Dynamics (CFD) approach and structural stress with variable valve opening on the condition of default by 11.1 mm, openings increased by 16.65 mm or 1.5 times, 2 times by 22.205 mm, and 2.5 times by 27.7 mm. Where the results of the simulation showed that the condition of the valve from 11.1 mm to 22.205 mm increased the average air velocity and mass flow rate, while at the opening valve 27.7 mm decreased average speed. The resulting stress value of the valve 11.1 mm to 27.7 mm continues to increase due to the force created in the spring getting into the valve then increasing the force on the spring.