3 edition of Prediction techniques for jet-induced effects in hover on STOVL aircraft found in the catalog.
Prediction techniques for jet-induced effects in hover on STOVL aircraft
1991 by National Aeronautics and Space Administration, Ames Research Center, For sale by the National Technical Information Service in Moffett Field, Calif, [Springfield, Va .
Written in English
|Other titles||Prediction techniques for jet induced ....|
|Statement||Douglas A. Wardwell, Richard E. Kuhn.|
|Series||NASA technical memorandum -- 102818.|
|Contributions||Kuhn, R. E., Ames Research Center.|
|The Physical Object|
The current state of the art in computational aerodynamics for whole-body aircraft flowfield simulations is described. Recent advances in geometry modeling, surface and volume grid generation, and flow simulation algorithms have led to accurate flowfield predictions for increasingly complex and realistic configurations. As a result, computational aerodynamics has . Report presenting an investigation of the maximum hovering time, or the time that a helicopter can sustain itself without motion, for helicopters using a reciprocating engine, by ramjet engines at the tips of rotor blades, and by pulse-jet engines at the tips of rotor blades. Testing showed that the reciprocating engine permitted much longer hovering time than the jet-propulsion engines, but. The reason some passengers weep uncontrollably or order strange beverages in the sky might be related to high levels of noise and air pressure in the cabin.
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Prediction techniques for jet-induced lift effects during hover are available, relatively easy to use, and produce adequate results for preliminary design work. Although deficiencies of the current method were found, it is still currently the best way to estimate jet-induced lift effects short of using computational fluid dynamics.
Its use is summarized in this report. There is still. Get this from a library. Prediction techniques for jet-induced effects in hover on STOVL aircraft. [Douglas A Wardwell; Richard E Kuhn; Ames Research Center.].
Prediction techniques for jet induced lift effects during hover are available, relatively easy to use, and produce adequate results for preliminary design work. Although deficiencies of the current method were found, it is still currently the best way to Prediction techniques for jet-induced effects in hover on STOVL aircraft book jet induced lift effects short of using computational fluid : Douglas A.
Wardwell and Richard E. Kuhn. A small scale ground effect test rig was used to study the ground plane flow field generated by a STOVL aircraft in hover. The objective of the research was to support NASA-Ames Research Center planning for the Large Scale Powered Model (LSPM) test for the ARPA-sponsored ASTOVL program.
Prediction Methods for Jet V/STOL Propulsion Aerodynamics. Strut and wall influence on the ground-plane flow of a hovering STOVL aircraft. 1 December Effect of Nozzle Spacing on Ground Interference Forces for a Two-Jet V/STOL Aircraft. William G. Hill Jr. and Cited by: 6. Prediction techniques for jet induced lift effects during hover are available, relatively easy to use, and produce adequate results for preliminary design work.
Although deficiencies of. NPR effects were looked at, however, in an extensive study of jet-induced interference effects undertaken by Shumpert and Tibbetts. Tests were conducted on a 14 per cent scale model of a jet VTOL aircraft with a fuselage-mounted lift system at pressure ratios of, and This book describes the flow fields generated by the mixing of exit flows with surrounding and free stream air and their effects on the aircraft and the surrounding flows have differing effects depending on the aircraft configuration and if the aircraft is in hover or transitional : Richard E.
Kuhn. Jet Aircraft Trajectory Prediction based upon BADA 47 commits 1 branch 0 packages 0 releases Fetching contributors Python HTML GAP.
Python %; HTML %; GAP %; Branch: master. New pull request Find file. Clone or download Clone with HTTPS Use Git or checkout with SVN using the web URL. techniques to the ground-effect ingestion problem has in Prediction Methods for Jet-Induced Effects on V/STOL Aircraft of exhaust gases of engines in V/STOL and STOVL aircraft in ground.
Comparison of experiments on bio-inspired hover kinematics with the unsteady vortex model and CFD. Ruben Vandenheede, Luis Effect of Free-Stream Turbulence on Control of Laminar Separation Bubbles Using Pulsed Vortex Generator Jets: Direct Numerical Simulations Extensible Rapid Transition Prediction for Aircraft Conceptual Design Using.
related to the rate of entrainment of the surrounding air and the consequent effect on lift loss. Because of the importance of the lift loss on the payload of a jet VTOL aircraft, it was felt that lift-loss tests should be conducted at large scale by utilizing an actual jet- engine exhaust as the test medium for correlation with the results of the small-scale.
Get this from a library. Jet-induced effects: the aerodynamics of jet- and fan-powered V/STOL aircraft in hover and transition. [Richard E Kuhn; Richard J Margason; Peter Curtis] -- The unique characteristics of V/STOL flight bring with it unique aerodynamic challenges.
Intended for the working professional or those in engineering graduate programs involved with V/STOL, this. The method of lift fan aircraft aerodynamic analysis (LFAAA) integrates 1) a linear potential flow solver for the fixed wing flight phase, 2) the blade-element-momentum theory (BEMT) method to analyze propulsion characteristics of the isolated lift fan, 3) the power induced effect (PIE) method to compute lift increment/decrement due to lift fan.
• Aircraft wiring health management. Data-driven Prediction Techniques • Sensor-Based Conditioning (cont’d) – AI/CI Techniques • Case-Based Reasoning • Intelligent Decision-Based Models • Min-Max Graphs • Support Vector Regression/Relevance Vector Regression. Comparison of CFD Hover Predictions on the S Rotor Jennifer N.
Abras1 NAVAIR Applied Aerodynamics and Store Separation Branch, Patuxent River, MD, and Nathan Hariharan2 HPCMP CREATE-AV, Lorton, VA, The S rotor is used as a baseline case to assess predictions made by different CFD solvers.
Ames added full-span slats to the wing to increase its lift. Tests were carried out in the by foot wind tunnel to define its performance, stability and control, and handling characteristics. With any wind, the aircraft could nearly hover out of ground effect, but it was ungainly and difficult to control in the presence of gusts.
A simple typical section approach to aircraft wing bending-torsion divergence and flutter is presented. The approach can be used to illustrate the significant effects of wing sweep and material orthotropy in response to either steady or a simplified unsteady aerodynamic loading.
Visual detection of aircraft by human observers is an important element of aviation safety. To assess and ensure safety, it would be useful to be able to be able to predict the visibility, to a human observer, of an aircraft of specified size, shape, distance, and coloration.
development of highly versatile aircraft. Since we are essentially creatures of the ground, we must learn how to adjust to the low pressures and temperatures of flight, and the effects of acceleration on the body.
Low visibility, with its associated problems of disorientation and problems related to the general physical and mental stress associated. Prof. Newman, Page 1 Aircraft Performance Prof. Dava Newman Sr. Lecturer Pete Young Introduction to Aerospace & Design 12 February Long-term effects of repeated exposure to JP-8 fuel vapor on higher cognitive capacity in rats.
Soc. Neurosci. Abstr. Rossi, J., A.F. Nordholm, R.L. Carpenter, G.D. Ritchie, and W. Malcolm. Effects of repeated exposure of rats to JP-5 or JP-8 jet fuel vapor on neurobehavioral capacity and neurotransmitter levels.
Toxicol. Environ. dangerous situations. Prediction algorithms extrapolate the current state of the aircraft based on the behavior of control laws and knowledge of mode transition logic design (for the FMS, APS and ATS). The resulting 4D trajectory represents the future flight path of the aircraft if the current course of action is continued.
This paper establishes a novel mathematical model for computing the plume flow field of a carrier-based aircraft engine. Its objective is to study the impact of jet exhaust gases with high temperature, high speed and high pressure on the jet blast deflector.
The present conference on VTOL, STOVL and V/STOL fixed-wing aircraft powered lift discusses hot gas recirculation in V/STOL, flight testing of a single-engine powered lift aircraft, RAF experience with VTOL, near-term improvements of the AV-8B Harrier II, recent advancements in thrust augmentation, lift ejectors for STOVL combat aircraft, the correlation of entrainment.
-Raise aircraft hover efficiency from 60 percent to at least 75 percent;-Present a more favorable cruise lift-to-drag ratio of at le up from 5 to 6. (Aircraft have high L/D ratio if they. The Human Systems Integration Division at NASA Ames Research Center, advances human-centered design and aerospace systems to make dramatic improvements in safety, efficiency and mission success.
The prediction or calculation of aircraft performance serves a twofold purpose: (1) to fix the airframe configuration best suited to a given job, and (2) to outline, in whatever detail is desired, the operational utility of any given machine. Thus the conception of any new aircraft must be based on an adequate solution of the performance problem.
Techniques and precautions designed to help operators deal with high thrust exhaust wakes are available in Boeing publications and other document sources. Operators should use this information to develop the necessary operational procedures and should address the engine wake hazard issue in their safety awareness and training programs.
The most useful aircraft in the world would take off, hover, and land like a helicopter but fly as fast as a plane. Decades of research toward this goal have resulted in.
Jet ventilation is a high-frequency air delivery system that is characterized by delivering rapid mechanical respirations and controlled pressure exhalations for those in respiratory distress.
It is common in hospital settings. It is used for patients of all ages who have a low oxygenation level. An illustration of an open book. Books. An illustration of two cells of a film strip.
Video. An illustration of an audio speaker. Audio. An illustration of a " floppy disk. Software. An illustration of two photographs. Images. An illustration of a heart shape Donate. – () This was the first aircraft to exceed the speed of sound. It was the first of the X planes, experi-mental aircraft designed for testing new technologies and usually kept highly secret.
On October 14th, Chuck Yeager flew this rocket-powered plane about mph (1, kilometers per hour) at 43, feet (13, meters) above. A one-stop Desk Reference, for engineers involved in all aspects of aerospace; this is a book that will not gather dust on the shelf.
It brings together the essential professional - Selection from Aerospace Engineering e-Mega Reference [Book]. TURBULENT JETS (air or water) and of other circumstances (such as diameter of outlet and discharge speed). This universal angle is giving approximately 24 from side to.
A tiltrotor is an aircraft which generates lift and propulsion by way of one or more powered rotors (sometimes called proprotors) mounted on rotating engine pods or nacelles usually at the ends of a fixed wing. It combines the vertical lift capability of a helicopter with the speed and range of a conventional fixed-wing vertical flight, the rotors are angled so the plane of.
In this paper a comprehensive experimental survey carried out at University of Glasgow is described, taking advantage of two different rotor rigs and several experimental techniques.
Load measurements on the rotor were carried out in order to assess the rotor performance for different positions with respect to a cubic obstacle, thus simulating.
Airplanes -- Periodicals. See also what's at your library, or elsewhere. Broader terms: Airplanes; Periodicals; Narrower terms: Aerodynamics -- Periodicals; Airplanes -- Collector. Cooling combustor chambers for gas turbine engines is challenging because of the complex flow fields inherent to this engine component.
This complexity, in part, arises from the interaction of high momentum dilution jets required to mix the fuel with effusion film cooling jets that are intended to cool the combustor walls. Water tunnel flow visualisation experiments on a slender delta wing have revealed some new phenomena connected with vortex breakdown.
Vortex breakdown hysteresis has been found, there being two steady flow states at some incidences, one with breakdown on.
A tiltrotor is an aircraft which generates lift and propulsion by way of one or more powered rotors (sometimes called proprotors) mounted on rotating engine pods or nacelles usually at the ends of a fixed wing or an engine mounted in the fuselage with drive shafts transferring power to rotor assemblies mounted on the wingtips.
It combines the vertical lift capability of a helicopter with .History of flight - History of flight - Avionics, passenger support, and safety: During the jet age, avionics, a coined term meaning “aviation electronics,” has seen a rapid growth in every aspect, including navigation, instrumentation, communication, safety, and landing assistance.
The advent of the cathode-ray oscilloscope and its application to aircraft spurred the avionics revolution.Aircraft icing is a severe aviation weather hazard as formation of ice on aircraft surfaces leads to degradation in aerodynamic performance.
Today, there are limited ice detection systems available that warn pilots of icing, used primarily by the military and airlines due to their high acquisition and certification costs.