Thermal comfort analysis of military aircraft cabin using computational fluid dynamics

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2022-9

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Köse, İrem

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Thermal comfort is essential for human health and welfare during aircraft operations. In military aircraft, these thermal problems are getting more difficult because of the high-altitude operations, cockpit transparency, mission flights, pilot clothing, and an increasing amount of mission equipment. Therefore, supplying the correct amount of cooling air into the cockpit, good air distribution around the occupants, and keeping the other thermal comfort measurements at a satisfactory level in the cockpit significantly impacts pilots’ thermal comfort. In this study, the thermal comfort of pilots in the cockpit is aimed to be developed with the help of thermal comfort measures and CFD modeling. During the evaluation, general thermal comfort parameters have been defined and assessed with the standards (JSSG-2009, SAE-ARP-85F, and MIL-E-18927E). Then, a suitable CFD turbulence model was chosen for the analyses, and it was validated with the numerical and experimental results given in the literature. With the performance model generation, the cockpit air distribution model was evaluated with the help of thermal comfort measures. According to the results, old-type piccolo air inlet models have been found insufficient to provide comfortable conditions to the occupant. Therefore, a more newly used version of the air inlet, which provides jet flow to the cabin, and foot inlet have been evaluated, and it was found more efficient than the piccolo-type air inlets. In addition, foot inlets influenced the air distribution around the cockpit positively. As a result of this study, evaluating the comfort with general parameters is not enough to compare the thermal conditions. However, the positive effect of changing the inlet type from piccolo to gasper and adding foot inlets has been observed.

Subject Keywords

CFD Modelling, Thermal Comfort, Piccolo inlet, Gasper inlet, WBGT

URI

https://hdl.handle.net/11511/99496

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

İ. Köse, “Thermal comfort analysis of military aircraft cabin using computational fluid dynamics,” M.S. - Master of Science, Middle East Technical University, 2022.