The Effect of Plenum Volume on the Test Section Flow Characteristics of a Perforated Wall Transonic Tunnel
The Effect of Plenum Volume on the Test Section Flow Characteristics of a Perforated Wall Transonic Tunnel

Author: C. F. Anderson

Publisher:

Published: 1970

Total Pages: 72

ISBN-13:

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Tests were conducted in the Aerodynamic Wind Tunnel (1T) of the Propulsion Wind Tunnel Facility to determine the effects of test section plenum chamber volume on the centerline Mach number distributions, wave-cancellation properties of perforated walls, model force data, and tunnel acoustics at Mach numbers from 0.6 to 1.3. Results were obtained with plenum chambers of four different sizes at plenum-to-test section volume ratios between 8.3 and 0.8. Reducing plenum volume produced no measurable effect at Mach numbers below 0.95. At Mach numbers above 0.95, decreasing the plenum volume increased the internal plenum losses, increased the plenum suction requirements, and increased the centerline Mach number deviations; however, the Mach number deviations were small at Mach numbers below 1.15. Reducing the plenum volume also produced a small increase in the effective wall porosity but had no measurable effect on measured model forces except to increase the forebody drag coefficient at Mach numbers above 1.05. Changes in the plenum volume had no significant effect on tunnel acoustics. (Author).

Between Two Plenums
Between Two Plenums

Author: Ellis Joffe

Publisher: University of Michigan Press

Published: 2020-08-06

Total Pages: 89

ISBN-13: 047290213X

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The origins of the Cultural Revolution are still shrouded in uncertainty. Crucial questions either remain unanswered or have been given answers which derive from conflicting interpretations. To what period can the direct origins of the Cultural Revolution be traced? What issues, if any, divided the leadership, and how deep were these divisions? What was the state of power relations and what was Mao’s position? Why did developments in the period preceding the Cultural Revolution reach a climax in such a convulsion? Between Two Plenums examines these questions as they apply to the years 1959–1962. At base, the perspective of pre-Cultural Revolution politics adopted therein is that of “conflict” rather than “consensus.” From this vantage point, the Eighth and Tenth Plenums loom in retrospect as important watersheds in the development of the intraleadership conflict which culminated in the great upheaval.

Plenum
Plenum

Author: Geoffreyjen Edwards

Publisher: Untimely Books

Published: 2022-04-15

Total Pages: 362

ISBN-13: 9780971663565

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A young star gardener embarks on a religious pilgrimage in this debut space opera. (Kirkus Reviews)

Annual Report
Annual Report

Author: School District of Philadelphia, Pa Board of Public Education

Publisher:

Published: 1909

Total Pages: 548

ISBN-13:

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Journal
Journal

Author: American Society of Heating and Ventilating Engineers

Publisher:

Published: 1915

Total Pages: 632

ISBN-13:

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Model Specification for Tunnelling
Model Specification for Tunnelling

Author: British Tunnelling Society

Publisher: Thomas Telford

Published: 1997

Total Pages: 158

ISBN-13: 9780727725882

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This reference aims to establish a common standars for the design and construction of tunnelling in the UK. With the minimum of modification the specification is also suitable for international use. It includes recent legislation, and indicates minimum standards for materials and workmanship, and has been written to be used as a contract specification on its own, or in conjunction with other standard specifications on multi-disciplinary projects. Drawing heavily on the practical experience of both corporate and individual members of the British Tunnelling Society, this document provides a sound basis for specifying tunnelling design and construction.