CHARACTERISTIC STUDY OF FIGHTER DIFFUSER BY CHANGE THE S-SHAPED RATIO

• Main Author: Wiweko S, Muhammad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43794
• Institution: Institut Teknologi Bandung

Indonesia is one of many countries that currently continuing to develop its capabilities on various department. One of the developed department through goverment institution is the defense department by designing modern fighter combat. This fighter has a multirole combat function with flight coverage from subsonic to supersonic. In order to be able to design a fighter plane, skilled workers with qualified capabilities are needed. Therefore a number of people were schooled to gain more knowledge in the field of airplanes. Research studies in a thesis at the end of master study are both of complementary and requirement that must be met. Research studies must be related to government programs in designing fighter combat. The fighter diffuser is the subject of this thesis. Diffuser is part of intake system consisting of inlet and diffuser itself, has the function of supplying air to the engine to ensure its performance. Most of supersonic fighter combat have a diffuser model by adopting the s-shaped to accommodate the space availability factor and anti-radar capability. The study uses one of the initial models of several iteration models that have been done by the team in the program, the model called XC103. This model is used because it still has shortcomings in terms of performance and has been replaced by the latest iteration model so that it can be used for public educational institutions. In this study carried out by changing the geometry of the diffuser in the s-shaped geometry. The reference used is sourced from the study of Wellborn et al with a geometry ratio H/L = 0.27, AR = 1.52 and L/Din = 5.0 as well as source of validation. Flying conditions are assumed at Mach 0.6 at 10,000 meters. The method used with 3-D CFD simulation on the validation model, the initial model and the modified diffuser geometry model. The results of the simulation are then analyzed and compared by characteristics of the air flow in the diffuser between the initial model and the modified model. Parameters such as velocity, mass flow, pressure up to flow pattern from the beginning to the end of the diffuser are generally better.