Flowfield Measurements in the NASA Lewis Research Center 9- By 15-Foot Low-Speed Wind Tunnel PDF Download
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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781730909931
Category :
Languages : en
Pages : 80
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Book Description
ational Aeronautics and Space Administration
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781730909931
Category :
Languages : en
Pages : 80
Get Book Here
Book Description
ational Aeronautics and Space Administration
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 82
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Book Description
Author: E. Allen Arrington
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722655570
Category :
Languages : en
Pages : 52
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Book Description
This manual describes the 9- by 15-Foot Low-Speed Wind Tunnel at the Lewis Research Center and provides information for users who wish to conduct experiments in this atmospheric facility. Tunnel variables such as pressures, temperatures, available tests section area, and Mach number ranges (0.05 to 0.20) are discussed. In addition, general support systems such as air systems, hydraulic system, hydrogen system, laser system, flow visualization system, and model support systems are described. Instrumentation and data processing and acquisition systems are also discussed. Soeder, Ronald H. Glenn Research Center...
Author: Milo D. Dahl
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 68
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Author:
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ISBN:
Category :
Languages : en
Pages : 190
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722155667
Category :
Languages : en
Pages : 64
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Book Description
The test section of the NASA Lewis 9- by 15-Foot Low Speed Wind Tunnel was acoustically treated to allow the measurement of acoustic sources located within the tunnel test section under simulated free field conditions. The treatment was designed for high sound absorption at frequencies above 250 Hz and to withstand tunnel airflow velocities up to 0.2 Mach. Evaluation tests with no tunnel airflow were conducted in the test section to assess the performance of the installed treatment. This performance would not be significantly affected by low speed airflow. Time delay spectrometry tests showed that interference ripples in the incident signal resulting from reflections occurring within the test section average from 1.7 dB to 3.2 dB wide over a 500 to 5150 Hz frequency range. Late reflections, from upstream and downstream of the test section, were found to be insignificant at the microphone measuring points. For acoustic sources with low directivity characteristics, decay with distance measurements in the test section showed that incident free field behavior can be measured on average with an accuracy of +/- 1.5 dB or better at source frequencies from 400 Hz to 10 kHz. The free field variations are typically much smaller with an omnidirectional source. Dahl, Milo D. and Woodward, Richard P. Glenn Research Center...
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 50
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 492
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