1,934 research outputs found
Advanced Turboprop Project
At the direction of Congress, a task force headed by NASA was organized in 1975 to identify potential fuel saving concepts for aviation. The result was the Aircraft Energy Efficiency (ACEE) Program implemented in 1976. An important part of the program was the development of advanced turboprop technology for Mach 0.65 to 0.85 applications having the potential fuel saving of 30 to 50 percent relative to existing turbofan engines. A historical perspective is presented of the development and the accomplishments that brought the turboprop to successful flight tests in 1986 and 1987
Fluid machines: Expanding the limits, past and future
During the 40 yr period from 1940 to 1980, the capabilities and operating limits of fluid machines were greatly extended. This was due to a research program, carried out to meet the needs of aerospace programs. Some of the events are reviewed. Overall advancements of all machinery components are discussed followed by a detailed examination of technology advancements in axial compressors and pumps. Future technology needs are suggested
Aeronautical Engineering: A special bibliography with indexes, supplement 67, February 1976
This bibliography lists 341 reports, articles, and other documents introduced into the NASA scientific and technical information system in January 1976
Aeronautical Engineering: A special bibliography, supplement 60
This bibliography lists 284 reports, articles, and other documents introduced into the NASA scientific and technical information system in July 1975
Aeronautical engineering: A special bibliography with indexes, supplement 80
This bibliography lists 277 reports, articles, and other documents introduced into the NASA scientific and technical information system in January 1977
Aeronautical Engineering: A special bibliography with indexes, supplement 72, July 1976
This bibliography lists 184 reports, articles, and other documents introduced into the NASA scientific and technical information system in June 1976
Aeronautical Engineering: A special bibliography with indexes, supplement 74
This special bibliography lists 295 reports, articles, and other documents introduced into the NASA scientific and technical information system in August 1976
Design and Experimental Validation of a Ducted Counter-rotating Axial-flow Fans System
An experimental study on the design of counter-rotating axial-flow fans was
carried out. The fans were designed using an inverse method. In particular, the
system is designed to have a pure axial discharge flow. The counter-rotating
fans operate in a ducted-flow configuration and the overall performances are
measured in a normalized test bench. The rotation rate of each fan is
independently controlled. The relative axial spacing between fans can vary from
17% to 310%. The results show that the efficiency is strongly increased
compared to a conventional rotor or to a rotor-stator stage. The effects of
varying the rotation rates ratio on the overall performances are studied and
show that the system has a very flexible use, with a large patch of high
efficient operating points in the parameter space. The increase of axial
spacing causes only a small decrease of the efficiencyComment: accepted in Journal of Fluid Engineerin
Aeronautical Engineering. A continuing bibliography with indexes, supplement 156
This bibliography lists 288 reports, articles and other documents introduced into the NASA scientific and technical information system in December 1982
Aeronautical Engineering: A continuing bibliography with indexes, supplement 99
This bibliography lists 292 reports, articles, and other documents introduced into the NASA scientific and technical information system in July 1978
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