Name: NASA Advanced Propeller Research (en Inglés)
SKU: 59973117
Price: 519.07 MXN
Availability: InStock
Author: Nasa Technical Reports Server (Ntrs)
ISBN: 9781289263935

portada NASA Advanced Propeller Research (en Inglés)

NASA Advanced Propeller Research (en Inglés)

Formato

Libro Físico

Autor

Nasa Technical Reports Server (Ntrs)

Editorial

Bibliogov

Idioma

Inglés

N° páginas

Encuadernación

Tapa Blanda

Dimensiones

24.6x18.9x0.2 cm

Peso

0.08 kg.

ISBN13

9781289263935

Categorías

Política y gobierno

NASA Advanced Propeller Research (en Inglés)

Nasa Technical Reports Server (Ntrs) (Autor) · Bibliogov · Tapa Blanda

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Reseña del libro "NASA Advanced Propeller Research (en Inglés)"

Acoustic and aerodynamic research at NASA Lewis Research Center on advanced propellers is reviewed including analytical and experimental results on both single and counterrotation. Computational tools used to calculate the detailed flow and acoustic i e l d s a r e described along with wind tunnel tests to obtain data for code verification . Results from two kinds of experiments are reviewed: ( 1 ) performance and near field noise at cruise conditions as measured in the NASA Lewis 8-by 6-Foot Wind Tunnel and ( 2 ) farfield noise and performance for takeoff/approach conditions as measured in the NASA Lewis 9-by 15-Font Anechoic Wind Tunnel. Detailed measurements of steady blade surface pressures are described along with vortex flow phenomena at off design conditions . Near field noise at cruise is shown to level out or decrease as tip relative Mach number is increased beyond 1.15. Counterrotation interaction noise is shown to be a dominant source at take off but a secondary source at cruise. Effects of unequal rotor diameters and rotor-to-rotor spacing on interaction noise a real so illustrated. Comparisons of wind tunnel acoustic measurements to flight results are made. Finally, some future directions in advanced propeller research such as swirl recovery vanes, higher sweep, forward sweep, and ducted propellers are discussed.