Computational and Experimental Studies of Pressure Relief Doors in Ventilated Nacelle Compartments
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Computational and Experimental Studies of Pressure Relief Doors in Ventilated Nacelle Compartments
P Pratt, J Watterson, E Benard
School of Aeronautical Engineering
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• Slender body
• Shear layers
• Compressible Flow
BackgroundBackground
• Requirement for Nacelle Ventilation
Pressure Relief Door
• Complex 3D combination of flow phenomena
• Oblique Jet
Assume Static Behaviour
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MethodologyMethodologyTheory
Experiments
CFD
• Use CFD to help with design of experiment
• Gather experimental performance data
• Validate CFD model to use for design
• Gain theoretical understanding of flow physics
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Experimental SetupExperimental Setup
h
l
Free-stream
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NACA TN4007 Vick, 1957NACA TN4007 Vick, 1957
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ResultsResults
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ResultsResults
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ResultsResults
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ResultsResults
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ResultsResults
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ResultsResults
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ResultsResults
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ResultsResults
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ResultsResults
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ResultsResults
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ResultsResults
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ResultsResults
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ConclusionsConclusions
• Good agreement between CFD and NACA TN4007
• Confidence in modelling assumptions
• Large amount of data available to focus experiment
• Potential applications in other fields Boundary layer control
Prevention of shock induced separation
Cooling and mixing