PENGURANGAN GAYA HAMBAT MENGGUNAKAN KONTROL PASIF PADA AFTER BODY PESAWAT TEMPUR C-X
Indonesian government, represented by Departmet of Defence, (DoD), have been creating a new project of 4.5 generation of Indonesian Fighter Aircraft C-X. This aircraft which has mission of multirole combat function that flies from subsonic to supersonic region. One of the main problems of this kind...
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| Format: | Theses |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/39638 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Indonesian government, represented by Departmet of Defence, (DoD), have been creating a new project of 4.5 generation of Indonesian Fighter Aircraft C-X. This aircraft which has mission of multirole combat function that flies from subsonic to supersonic region.
One of the main problems of this kind of aircraft is the high drag force that affects the reduction of the aircraft performance. Up to 50% of the total drag force is produced by after body of the aircraft at transonic condition, mainly due to the interactions between the rear-flow, boatail and the flame/plume come out from the nozzle.
The goal of this study is to find such a tool that can minimize drag crated by the interactions. Trade off study was conducted to choose a passive control attached in front of the nozzle. The benefit of this passive control is to delay the separation of the rear-flow, avoiding the increase of pressure drag. A CFD model was built in helping to investigate the phenomena, and to optimize the passive control. The accuracy of CFD model was first verified, by comparing to the available wind tunnel test data. Having this model proven, the numerical analysis the interaction of the flow for the actual case, (C-X) is carried out at and altitude of 10,000 feet and Mach 0.8 for target design, and Mach 0.6 and 1.2 for off design condition, with jet pressure ratio Nozzle (NPR) ~ 4. Several configurations were run to have sensitivity analysis of design variables.
Obstacle still occurs, (since the CFD running time is quite long for such a complex physical phenomena), to find the optimum design of the aimed passive control device. Surrogate model was choosen to solve this problem. Using data from CFD sensitivity analysis, the optimum design was found by relatively “cheap” surrogate code. |
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