Agreement for MDTF grant
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Agreement for MDTF grant
NASA Technical Memorandum 4004Operational Performance of Vapor-Screen Systems for In-Flight Visualization of Leading-Edge Vortices on the F-106B Aircr Agreement for MDTF grant raftJohn E. Lamar, Philip w. Brown, Robert A. Bruce, Joseph D. Pride, Jr., Ronald II. Smith, and Thomas 1). Johnson, Jr.SEPTEMBER IỌ87i\J/\SANASA Technical Memorandum 4004Operational Performance of Vapor-Screen Systems for In-Flight Visualization of Leading-Edge Vortices on the F-106B AircraftJohn E Agreement for MDTF grant . Lamar, Philip w. Brown, Robert A. Bruce, Joseph D. Pride, Jr., and Ronald H. SmithLangley Research CenterHampton, VirginiaThomas D. Johnson, Jr.PRCAgreement for MDTF grant
Ken iron. Inc.Hampton, VirginiaNASANational Aeronautics and Space AdministrationScientific and TechnicalInformation Office1987AbstractA Hight researchNASA Technical Memorandum 4004Operational Performance of Vapor-Screen Systems for In-Flight Visualization of Leading-Edge Vortices on the F-106B Aircr Agreement for MDTF grant se was to obtain qualitative and quantitative information about near-fleld vortex Hows above the wings of lighter aircraft and ascertain the effects of Reynolds ami Mach numbers over an angle-of-attack range.I The hardware for the sy terns required for flight application of the vapor-screen techniqu Agreement for MDTF grant e was■ successfully developed and integrated. Details of I each system, its operational performance on the F-106B aircraft , and pertinent aircraft anAgreement for MDTF grant
d environmental data collected arc presented.IntroductionCurrent and future military aircraft do and will use vortical flows to gain high-y maneuver pNASA Technical Memorandum 4004Operational Performance of Vapor-Screen Systems for In-Flight Visualization of Leading-Edge Vortices on the F-106B Aircr Agreement for MDTF grant signer may not know whether the vortex system behaved in Hight the same as in the design assumptions or in the wind-tunnel tests. Therefore, a need exists to actively observe the vortex system in terms of the I core location and extent of the vortex as functions of Reynolds number and Mach number in Agreement for MDTF grant order to further optimize a configuration.■flic vapor-screen technique is a proven method to visualize the flow about models in wind tunnels for whicAgreement for MDTF grant
h the ambient light level is low. This technique is a logical choice for examining vortical flows in flight since only a thin cross section of the floNASA Technical Memorandum 4004Operational Performance of Vapor-Screen Systems for In-Flight Visualization of Leading-Edge Vortices on the F-106B Aircr Agreement for MDTF grant used to illuminate the vortex flow, better contrast with ambient light occurs by flying at night. In order to record the resulting images, one can imagine using techniques employed by others, that is, a chase plane or ground-based photography. However, the first is not safe for high-0 maneuvers, an Agreement for MDTF grant d the second is unacceptable from a logistical point of view, in particular, if the target was shielded by the wing. Hence, the visual recording equipAgreement for MDTF grant
ment must be located on the vortexgenerating aircraft.In the late 1970's, the Soviets made a successful flight application of the vapor-screen techniqNASA Technical Memorandum 4004Operational Performance of Vapor-Screen Systems for In-Flight Visualization of Leading-Edge Vortices on the F-106B Aircr Agreement for MDTF grant e events (ref. 1).At the start of the present work, such capability was not available in the United States, so hardware had to be developed. Because of the variety of maneuvers to be flown with this application of the vapor-screen technique, an initial constraint was imposed for the seeding to be we Agreement for MDTF grant ather independent. This disallowed total dependence on atmospheric water vapor and created the need for an onboard seeding system, which was satisfiedAgreement for MDTF grant
by vaporizing propylene glycol. The other two systems are a mercury-arc lamp with appropriate optics for light-sheet generation and a low-light-levelNASA Technical Memorandum 4004Operational Performance of Vapor-Screen Systems for In-Flight Visualization of Leading-Edge Vortices on the F-106B Aircr Agreement for MDTF grant tal testing was done on the individual systems alone and then together during a complete-integration test on a full-scale semispan F-106B model (half-airplane) in the Langley 30- by 60-Foot Tunnel, prior to flight. That test program and it.s results are discussed in reference 2.In the present rejior Agreement for MDTF grant L, details of the flight project, including types of data taken, the various systems, and their operational performance, arc given. Furthermore. selecAgreement for MDTF grant
ted flight records for the aircraft and environmental data arc included. A summary' of this work ami of t he scientific results obtained is given in rNASA Technical Memorandum 4004Operational Performance of Vapor-Screen Systems for In-Flight Visualization of Leading-Edge Vortices on the F-106B Aircr Agreement for MDTF grant g. I)(/ distance along leading edge to probe tip from wing-fuselage juncture, in.FS fuselage station on aircraft, in. (see fig 1)g load factor normal to longitudinal axis of aircraft Agreement for MDTF grant NASA Technical Memorandum 4004Operational Performance of Vapor-Screen Systems for In-Flight Visualization of Leading-Edge Vortices on the F-106B AircrGọi ngay
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