Exploratory Flow Visualization Investigation of Mast-mounted Sights in the Presence of a Rotor

Exploratory Flow Visualization Investigation of Mast-mounted Sights in the Presence of a Rotor PDF Author: Terence A. Ghee
Publisher:
ISBN:
Category : Flow visualization
Languages : en
Pages : 40

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Exploratory Flow Visualization Investigation of Mast-mounted Sights in the Presence of a Rotor

Exploratory Flow Visualization Investigation of Mast-mounted Sights in the Presence of a Rotor PDF Author: Terence A. Ghee
Publisher:
ISBN:
Category : Flow visualization
Languages : en
Pages : 40

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Exploratory Flow Visualization Investigation of Mast-Mounted Sights in Presence of a Rotor

Exploratory Flow Visualization Investigation of Mast-Mounted Sights in Presence of a Rotor PDF Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722223472
Category :
Languages : en
Pages : 36

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Book Description
A flow visualization investigation with a laser light sheet system was conducted on a 27-percent-scale AH-64 attack helicopter model fitted with two mast-mounted sights in the langley 14- by 22-foot subsonic tunnel. The investigation was conducted to identify aerodynamic phenomena that may have contributed to adverse vibration encountered during full-scale flight of the AH-64D apache/longbow helicopter with an asymmetric mast-mounted sight. Symmetric and asymmetric mast-mounted sights oriented at several skew angles were tested at simulated forward and rearward flight speeds of 30 and 45 knots. A laser light sheet system was used to visualize the flow in planes parallel to and perpendicular to the free-stream flow. Analysis of these flow visualization data identified frequencies of flow patterns in the wake shed from the sight, the streamline angle at the sight, and the location where the shed wake crossed the rotor plane. Differences in wake structure were observed between the sight configurations and various skew angles. Analysis of lateral light sheet plane data implied significant vortex structure in the wake of the asymmetric mast-mounted sight in the configuration that produced maximum in-flight vibration. The data showed no significant vortex structure in the wake of the asymmetric and symmetric configurations that produced no increase in in-flight adverse vibration. Ghee, Terence A. and Kelley, Henry L. Unspecified Center RTOP 505-59-36-01; RTOP 282-10-01-01...

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports PDF Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 376

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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Monthly Catalog of United States Government Publications

Monthly Catalog of United States Government Publications PDF Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1092

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Monthly Catalogue, United States Public Documents

Monthly Catalogue, United States Public Documents PDF Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1094

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NASA Technical Memorandum

NASA Technical Memorandum PDF Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 176

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NASA Langley Scientific and Technical Information Output, 1995

NASA Langley Scientific and Technical Information Output, 1995 PDF Author:
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 172

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Book Description
This document is a compilation of the scientific and technical information that the Langley Research Center has produced during the calendar year 1995. Included are citations for formal reports, high-numbered conference publications, high-numbered technical memorandums, contractor reports, journal articles and other publications, meeting presentations, technical talks, computer programs, tech briefs, and patents.

Government Reports Announcements & Index

Government Reports Announcements & Index PDF Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 536

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Proceedings of the ... ASME Design Engineering Technical Conferences

Proceedings of the ... ASME Design Engineering Technical Conferences PDF Author:
Publisher:
ISBN:
Category : Computer-aided design
Languages : en
Pages : 622

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Aeronautical Engineering: A Cumulative Index to a Continuing Bibliography (supplement 325)

Aeronautical Engineering: A Cumulative Index to a Continuing Bibliography (supplement 325) PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 470

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