SIMULATING THE EFFECTS OF EXHAUST SYSTEM’S SIZE ON 1NZ-FE ENGINE’S PERFORMANCE USING RICARDO WAVE

• Main Author: Wisnumurti Buntaran, Junius
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/53644
• Institution: Institut Teknologi Bandung

Exhaust manifold is one of the most important component in the internal combustion engine In this research, two models of 1NZ-FE internal combustion engine was constructed in commercial software program Ricardo Wave. The simulation process is one-dimensional. In the first model, simulated components include the combustion chamber, valves, intake and exhaust manifolds. The second model includes the first model in addition to a catalyst and a silencer. Simulation results are compared to brake power and torque specification sheet. Exhaust manifold’s length and diameter are varied in the first model. Catalyst length, silencer diameter, and silencer length are varied in the second model. Values with the highest brake torque are selected for each engine speed. This process is called tuning. In the first model, a combination of tuned diameter and length could increase brake power, brake torque, and brake mean effective pressure (BMEP) by 2.71%, volumetric efficiency by 2.52%, scavenging efficiency by 1.17%, and reducing brake specific fuel consumption (BSFC) by 0.18%. In the second model, a combination of tuned components’ diameter and length could increase brake power, brake torque, and BMEP by 0.25%, volumetric efficiency by 0.03%, scavenging efficiency by 0.01%, and reducing BSFC by 0.10%. Tuning process could improve engine performance because of two factors. First, it decreases resistance of the exhaust flow allowing it to expel exhaust gas easier. Second, it could time the arrival of pressure wave so that lower sub-atmospheric pressure arrives at the overlap period of intake and exhaust valves, helping the scavenging process.