C-130H 항공기 DIRCM 장비 부착에 따른 여압 특성 변화에 관한 전산해석 연구

초록

This study performed unsteady Reynolds-Averaged Navier–Stokes (RANS) simulations to evaluate the effects of additional perforations caused by the installation of a Directional Infrared Counter Measures (DIRCM) system on the cabin pressurization characteristics of a C-130H aircraft. The equivalent leakage area was derived from full-scale pressure decay tests and incorporated into a modified numerical model that included DIRCM-mounted components and connecting ducts. Simulations were conducted under both ground and high-altitude flight conditions for the baseline and modified configurations to compare internal pressure and leakage flow characteristics. Under ground conditions, the baseline model accurately reproduced reference pressure trends, validating the computational approach. The modified model exhibited faster pressure decay due to increased leakage flow. Under flight conditions, applying the leakage flow rate from the ECS-off case as a compensatory inflow maintained cabin pressure, demonstrating the stabilizing effect of ECS operation. The actuator disk model used for the ECS fan reproduced localized flow acceleration near the fan disk but had minimal impact on overall mass balance. These results provide a quantitative basis for assessing pressurization performance following aircraft modifications.

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