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The large low-speed facility (LLF) in Marknesse is an industrial wind tunnel for the low-speed domain.
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Type of wind tunnel
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Closed circuit, atmospheric, continuous low-speed wind tunnel with one closed wall and one configurable (slotted) wall test section and an open jet.
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Main features
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Closed wall test sections
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Fixed section
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9.5 m x 9.5 m: 0 < V < 62 m/s
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Configurable section with the following two configurations
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8 m x 6 m: 0 < V < 116 m/s
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6 m x 6 m: 0 < V < 152 m/s
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Open jet
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8 m x 6 m: 0 < V < 80 m/s
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Model support
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Remotely controlled sting support system with four degrees of freedom for models with internal balance
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External six-component balance
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Floor-based model support system for open jet testing with three degrees of freedom
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Auxiliary systems
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Compressed air supply with a capacity of 5 kg/s continuously at 80 bar
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Vacuum system
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Moving belt ground plane for ground simulation
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Microphone traversing system
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Microphone wall arrays
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Typical tests
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Configuration studies, database creation (civil and military transport aircraft, fighters, helicopters, spacecraft, cars and trucks)
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Engine integration studies with air-powered simulators
- turbofan-powered aircraft by means of TPS
- propeller-driven aircraft
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Air exhaust simulation with compressed air
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Air intake surveys for fighters and helicopters
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Aeroacoustic and performance testing on rotorcraft models
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Aeroacoustic testing on full-scale aircraft components (landing gears, wings)
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Aeroacoustic investigations on scaled turbofans
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Full-scale cars and trucks (drag and aeroacoustics)
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