Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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Fairing Design Optimization of Missile Hanger for Drag Reduction

유도탄 행거 항력 저감을 위한 페어링 형상 최적화

  • Jeong, Sora (The 1st Research and Development Institute, Agency for Defense Development)
  • 정소라 (국방과학연구소 제1기술연구본부)
  • Received : 2019.04.12
  • Accepted : 2019.06.21
  • Published : 2019.08.05
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Abstract

Hanger in a rail-launched missile protrudes in general and causes to increase significant drag force. One method to avoid the significant increase of drag force is to apply fairings on the hanger. In this paper, sloping shaped fairing parameters of height, width, and length are optimized to minimize the drag force under subsonic speed region by examining three configurations of fairings : front-fairing only, rear-faring only, and the both front and rear fairing. We use Latin Hypercube Sampling method to determine the experimental points, and computational fluid dynamics with incompressible RANS solver was applied to acquire the data at sampling points. Then, we construct a meta model by kriging method. We find the best choice among three configurations examined : both front and rear fairing reduce the drag force by 63 % without the constraint of fairing mass, and front fairing reduced the drag force by 52 % with the constraint of hanger mass.

Keywords

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Fig. 1. AIM-9L(Air-to-Air Missile)[2]

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Fig. 2. AIM-9X(Air-to-Air Missile)[3]

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Fig. 3. Model configuration

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Fig. 4. Design space of faring

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Fig. 5. Design variable and objective function area

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Fig. 6. Valid space of variables A, B1, B2, C1, C2 at CASE 1,2

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Fig. 8. Latin hypercube sampling for CASE 1

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Fig. 9 Latin hypercube sampling for CASE 2

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Fig. 10. Latin hypercube sampling for CASE 3

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Fig. 11. Surface mesh configuration

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Fig. 12. Grid dependency test

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Fig. 13. Pressure contour of hanger

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Fig. 14. Sensitivity of CASE 1,2,3

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Fig. 15. Meta model of A vs. B2 vs. Cd (CASE 1)

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Fig. 16. Meta model of A vs. B1 vs. Cd (CASE 2)

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Fig. 19. Optimized hanger geometries

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Fig. 7. Valid space of variables A, B1, C1 at CASE 3

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Fig. 17. Meta model of A vs. B1 vs. Cd (CASE 3)

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Fig. 18 Meta model of A vs. B2 vs. Cd (CASE 3)

Table 1. Optimization results

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Table 2. Optimization results for mass limit

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Table 3. Validation of results

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