Download or read book Survey of Lift Fan Aerodynamic Technology written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-16 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Representatives of NASA Ames Research Center asked that a summary of technology appropriate for lift-fan powered short takeoff/vertical landing (STOVL) aircraft be prepared so that new programs could more easily benefit from past research efforts. This paper represents one of six prepared for that purpose. The authors have conducted or supervised the conduct of research on lift-fan powered STOVL designs and some of their important components for decades. This paper will first address aerodynamic modeling requirements for experimental programs to assure realistic, trustworthy results. It will next summarize the results or efforts to develop satisfactory specialized STOVL components such as inlets and flow deflectors. It will also discuss problems with operation near the ground, aerodynamics while under lift-fan power, and aerodynamic prediction techniques. Finally, results of studies to reduce lift-fan noise will be presented. The paper will emphasize results from large scale experiments, where available, for reasons that will be brought out in the discussion. Some work with lift-engine powered STOVL aircraft is also applicable to lift-fan technology and will be presented herein. Small-scale data will be used where necessary to fill gaps. Hickey, David H. and Kirk, Jerry V. Ames Research Center...

Download or read book Survey of Lift fan Aerodynamic Technology written by and published by . This book was released on 1993 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Definition Study of a Lift cruise Fan Technology V STOL Airplane Summary written by and published by . This book was released on 1975 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aerodynamic Experiments on a Ducted Fan in Hover and Edgewise Flight written by Leighton Montgomery Myers and published by . This book was released on 2009 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ducted fans and ducted rotors have been integrated into a wide range of aerospace vehicles, including manned and unmanned systems. Ducted fans offer many potential advantages, the most important of which is an ability to operate safely in confined spaces. There is also the potential for lower environmental noise and increased safety in shipboard operations (due to the shrouded blades). However, ducted lift fans in edgewise forward flight are extremely complicated devices and are not well understood. Future development of air vehicles that use ducted fans for lift (and some portion of forward propulsion) is currently handicapped by some fundamental aerodynamic issues. These issues influence the thrust performance, the unsteadiness leading to vehicle instabilities and control, and aerodynamically generated noise. Less than optimum performance in any of these areas can result in the vehicle using the ducted fan remaining a research idea instead of one in active service. The Penn State Department of Aerospace Engineering initiated an experimental program two years ago to study the aerodynamics of ducted lift fans. The focus of this program from its initiation was to study a single lift fan subject to an edgewise mean flow. Of particular concern was the transitional flow regime from hover to a relatively high forward speed in which a major portion of the vehicle lift is produced by the aerodynamic forces on the body. We refer to this as ducted fan edgewise flow. There are four obvious consequences of operating a ducted lift fan in edgewise (forward) flow. First, separations off the leading portion of the duct can reduce the inflow and thus the thrust of the fan. Second, the separated flow will lead to unsteadiness which will undoubtedly decrease the control authority of the vehicle. Thirdly, the outer surface of the fan shroud is likely to be fairly blunt. This body shape, together with the strong momentum drag of the lift fan outflow, produce excessive drag forces that increase the requirements of the propulsion devices. Finally, increased turbulence of the inflow will also result in increased production of aerodynamic noise. The goals of this project are to conduct detailed experiments on several configurations of ducted lift fans in hover and edgewise flow. Single ducted lift fan configurations involve different shrouded duct shapes and rotor shapes. Rotors are tested with a range of solidities and tip clearances. Including inlet duct vents over the forward portion of the duct shroud, has the potential of reducing the problem of separated flow over the forward portion of the duct inlet, and potentially reducing the drag of the vehicle in forward flight.

Download or read book Engineering study on the effect of advanced technology on lift fan V STOL transport aircraft written by and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Definition Study of a Lift cruise Fan Technology V STOL Aircraft Volume 2 Technology Aircraft written by and published by . This book was released on 1975 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book A Review of Aerodynamic Noise from Propellers Rotors and Lift Fans written by Jack E. Marte and published by . This book was released on 1970 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Summary of Lift and Lift cruise Fan Powered Lift Concept Technology written by and published by . This book was released on 1993 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Lift fan Aircraft Lessons Learned written by and published by . This book was released on 1995 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Definition Study of NASA Navy Lift cruise Fan V STOL Aircraft written by R.L. Cavage and published by . This book was released on 1975 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design of a Lift Fan Engine for a Heavy Lift Aircraft written by James E. Goebel and published by . This book was released on 2003-12-01 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent conflicts have highlighted the difficulties in using aircraft to supply troops in modern warfare. Lift fan technology is seen as one way in which to improve future supply aircraft to meet the needs of the military. A previous study designed a heavy lift aircraft with lift fan engines that used future engine technology. This present study modified the design by using current engine technology for the lift fan engines. The modification is important because a design that uses current technology is more likely to be brought into service in the near future. This thesis documents the process required to use current technology in a lift fan engine for a heavy lift aircraft. The process uses current software and focuses on the design of the following components: the powerplant the transmission shafts and the lift fan. The result is a propulsion system which allows a 185,000 lb aircraft to takeoff vertically as well as cruise at speeds greater than Mach 0.6.

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aerodynamic Characteristics of a Large scale V STOL Transport Model with Tandem Lift Fans Mounted at Mid semispan of the Wing written by Stanley O. Dickinson and published by . This book was released on 1971 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1994-10 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aerodynamics Model for a Generic ASTOVL Lift fan Aircraft written by Lourdes G. Birckelbaw and published by . This book was released on 1995 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book V STOL Maneuverability and Control written by and published by . This book was released on 1984 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: