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ISBN 10: 9370926054 ISBN 13: 9789370926059
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Paperback or Softback. Condition: New. Mean Flow and Noise Prediction for a Separate Flow Jet with Chevron Mixers. Book.
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MEDIEVALES 10, Presses du Centre d'Etudes Médiévales, Université de Picardie-Jules Verne, sans date, 146 p., broché, bon état et intérieur très propre. Articles en français et en allemand.
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Published by Creative Media Partners, LLC, 2025
ISBN 10: 1025158849 ISBN 13: 9781025158846
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ISBN 10: 1025158849 ISBN 13: 9781025158846
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Published by Creative Media Partners, LLC Mai 2025, 2025
ISBN 10: 1025154088 ISBN 13: 9781025154084
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Condition: New. KlappentextrnrnReported here is a design study of a propeller for a vehicle capable of subsonic flight in Earth s stratosphere. All propellers presented were required to absorb 63.4 kW (85 hp) at 25.9 km (85,000 ft) while aircraft cruise velocit.
Language: English
Published by Creative Media Partners, LLC, 2025
ISBN 10: 1025158849 ISBN 13: 9781025158846
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Published by Creative Media Partners, LLC Mär 2013, 2013
ISBN 10: 1288910975 ISBN 13: 9781288910977
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Taschenbuch. Condition: Neu. Neuware - Reported here is a design study of a propeller for a vehicle capable of subsonic flight in Earth's stratosphere. All propellers presented were required to absorb 63.4 kW (85 hp) at 25.9 km (85,000 ft) while aircraft cruise velocity was maintained at Mach 0.40. To produce the final design, classic momentum and blade-element theories were combined with two and three-dimensional results from the Advanced Ducted Propfan Analysis Code (ADPAC), a numerical Navier-Stokes analysis code. The Eppler 387 airfoil was used for each of the constant section propeller designs compared. Experimental data from the Langley Low-Turbulence Pressure Tunnel was used in the strip theory design and analysis programs written. The experimental data was also used to validate ADPAC at a Reynolds numbers of 60,000 and a Mach number of 0.20. Experimental and calculated surface pressure coefficients are compared for a range of angles of attack. Since low Reynolds number transonic experimental data was unavailable, ADPAC was used to generate two-dimensional section performance predictions for Reynolds numbers of 60,000 and 100,000 and Mach numbers ranging from 0.45 to 0.75. Surface pressure coefficients are presented for selected angles of attack. in addition to the variation of lift and drag coefficients at each flow condition. A three-dimensional model of the final design was made which ADPAC used to calculated propeller performance. ADPAC performance predictions were compared with strip-theory calculations at design point. Propeller efficiency predicted by ADPAC was within 1.5% of that calculated by strip theory methods, although ADPAC predictions of thrust, power, and torque coefficients were approximately 5% lower than the strip theory results. Simplifying assumptions made in the strip theory account for the differences seen.
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Published by Creative Media Partners, LLC, 2025
ISBN 10: 1025154088 ISBN 13: 9781025154084
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