SIMULATION OF THE EFFECT OF INJECTION PRESSURE, INJECTION HOLE DIAMETER, AND COMBUSTION CHAMBER PRESSURE ON INJECTION SPEED AND DROPLET DIAMETER OF DIESEL FUEL

• Main Author: Gunawan, Theo
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61769
• Institution: Institut Teknologi Bandung

Diesel motors are known for their tough and high-efficiency motors. Optimal performance of the diesel engine requires precise settings, especially in the process of mixing the fuel coming out of the injector and the pressure of the combustion chamber. This study simulates the injection pressure, injection hole diameter, and combustion chamber pressure using ANSYS Fluent software with 2 dimension of combution chamber and KHRT method for droplet model. The test parameters were taken are the injection speed, droplet diameter (average diameter, minimum diameter, critical diameter, and time to reach the critical diameter). The results showed that higher injection pressure make the injection speed faster, the droplet diameter smaller, and the time to reach the critical diameter shorter. Larger injection hole diameter make the injection speed slower, the droplet diameter larger, and the time to reach the critical diameter longer. Higher combustion chamber pressure make the injection speed slower, the droplet diameter larger, and the time to reach the critical diameter longer. Different results were found at injection pressures of 150 MPa, 180 MPa, and 210 MPa, especially the minimum droplet diameter and critical droplet diameter parameters were not in accordance with the existing theory. This is influenced by the high injection speed and the large initial diameter of the droplet so the drag force that occurs is bigger which causes the droplets to be more easily split.