3 edition of On the use of external burning to reduce aerospace vehicle transonic drag found in the catalog.
On the use of external burning to reduce aerospace vehicle transonic drag
Charles J. Trefny
by NASA, For sale by the National Technical Information Service in [Washington, D.C.], [Springfield, Va
Written in English
|Statement||Charles J. Trefny.|
|Series||NASA technical memorandum -- 103107.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
|Pagination||14 p. :|
|Number of Pages||14|
The minimum drag occurs at a fairly low angle of attack, in this case slightly above zero degrees AoA. Unfortunately, the lifting ability is very low at low angles of attack. At each angle of attack, the lift/drag ratio is the ratio between lift and drag or between the coefficient of lift and the coefficient of drag. Read chapter A R&T Challenges for Aerodynamics and Aeroacoustics: The U.S. air transportation system is very important for our economic well-being and nat.
The continuous surge in gas prices has raised major concerns about vehicle fuel efficiency, and drag reduction devices offer a promising strategy. In this paper, we investigate the mechanisms by which geometrically optimized bumps, placed on the rear end of the cabin roof of a generic truck, reduce aerodynamic drag. The incorporation of these devices requires proper choices of Cited by: 2. Aerodynamic drag of compact electric vehicles is of significant interest in reducing energy consumption. This study focused on how to reduce drag for a compact electric vehicle by shape optimization such as lengthening the tail, changing the front-windshield inclination, modifying the diffuser angle and filling up the front structure details of the vehicle : Jia Wang, Hui Zhu, Zhi Gang Yang.
This includes force and pressure measurements for most configurations. The slots generate useful, but small, drag reductions with the best configurations giving reductions in drag coefficient (C d) of approximately , whereas the best taper configurations reduce C d by close to The slots also have a tendency to modify the by: 4. A rear aerodynamic device for a vehicle and vehicle equipped with such a device are provided. The aerodynamic device can be fastened under a rear end of a vehicle frame of a cargo body of an industrial vehicle, behind the wheels. It includes a nozzle having an inlet positioned on a lateral external face of the device and capable of canalising air flowing along the vehicle and an outlet Cited by:
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Get this from a library. On the use of external burning to reduce aerospace vehicle transonic drag. [Charles J Trefny; United States.
National Aeronautics and Space Administration.]. Get this from a library. Experiments and analysis concerning the use of external burning to reduce aerospace vehicle transonic drag. [Charles J Trefny; United States. National Aeronautics and Space Administration.].
On the use of external burning to reduce aerospace vehicle transonic drag by: Trefny, Charles J. Published: () Viscous drag reduction in boundary.
“On the use of External Burning to reduce Aerospace Vehicle Transonic Drag”. 26“’ AIAA/ASME/SAE/ASEE Joint Propulsion Conference, AIAA–, Google Scholar Cited by: 1. Theoretical/numerical study of feasibility of use of winglets on low aspect ratio wings at subsonic and transonic Mach numbers to reduce drag [microform] / John M.
Kuhlman, Paul Liaw, and Michael J. Cereney National Aeronautics and Space Administration, Scientific and Technical Information Division ; For sale by the National Technical. Influence of base modifications on in-flight base drag in the presence of jet exhaust for Mach numbers f Experiments and analysis concerning the use of external burning to reduce aerospace vehicle transonic dr Wave drag and high-speed performance of supersonic STOVL fighter configurations [microform] / Donald A.
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OK, now I forgot to mention the center of drag so far. It is of minor importance because the drag force is so much smaller than the lift force. The concept is the same: Sum up all drag contributions and find the point where a discrete force applied in the direction of drag has the same effect.
Both induced drag and skin friction drag are targets for drag reduction technologies. Skin friction drag can be reduced by maximizing the amount of laminar flow on the aircraft.
In areas where turbulent flow remains, drag reductions are possible through the use of riblets. The active trailing edge concept can reduce drag through. Transonic Aerodynamics: Problems in Asymptotic Theory (Frontiers in Applied Mathematics) by L.
Pamela Cook (Editor) ISBN ISBN Why is ISBN important. ISBN. This bar-code number lets you verify that you're getting exactly the right version or edition of a book Author: L.
Pamela Cook. Effects of Base Shape to Drag at Transonic and Supersonic Speeds by CFD bleed use concept of reducing base drag by injection gas generated by. Commercial jet aircraft produced in the United States are highly competitive, but they are also the result of technology investments made a long time ago.
Technologies used to support the launch of the Boeingthe most recent model of U.S. widebody aircraft, were developed over 20 years ago. The effects of a diminished or misdirected. Supersonic travel is a rate of travel of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately m/s (1, ft/s; mph; kn; 1, km/h).Speeds greater than five times the speed of sound (Mach 5) are often referred to as hypersonic.
and as the size of the vehicle increases, the land-ing gear installation becomes a greater risk. Finally, there is a concern that the reference vehicle has too low a ﬁneness ratio (relatively blunt conﬁgura-tion) and may be imposing higher drag losses than necessary.
For further information, including about cookie. A nose cone designed to reduce heat transfer to the internal structure by the use of an ablating material. aerospace vehicle A vehicle capable of flight within and outside the sensible atmosphere.
For a transonic body, the area rule is applied by subtracting from, or adding to, its cross-sectional area distribution normal to the air. Can now use computational simulations as a numerical wind tunnel • Especially in 2D, many codes include grid generation, and can be used to investigate airfoil characteristics and modiﬁcations – Remember adding “bumps” to the subsonic airfoil.
• TSFOIL2 is an available and free transonic code, the next chart illustrates its accuracy. Aerospace bearing — Aerospace bearings are the bearings installed in aircraft and aerospace systems including commercial, private, military, or space applications.
Aerospace engineering — is the primary field of engineering concerned with the development of aircraft and spacecraft. . The main aim is to reduce noise, but it seems obvious that there would also be the benefit of drag reduction. With that being said, I am currently looking into and trying to figure out the constraints there are to work with, and what exactly is the area or space available to.
Class 8 tractor-trailers consume % of the total US petroleum use. At highway speeds, 65% of the energy expenditure for a Class 8 truck is in overcoming aerodynamic drag.
The project objective is to improve fuel economy of Class 8 tractor-trailers by providing guidance on methods of reducing drag by at least 25%.
A 25% reduction in drag would present a 12% improvement Cited by: 1. The Swirl Tube an Aircraft Drag Management Device to Reduce Noise and Fuel Burn from AEROSPACE engine at École Normale Supérieure.Theory of Aerospace Propulsion, Second Edition, teaches engineering students how to utilize the fundamental principles of fluid mechanics and thermodynamics to analyze aircraft engines, understand the common gas turbine aircraft propulsion systems, be able to determine the applicability of each, perform system studies of aircraft engine systems for specified flight .reduce friction drag become more effective in reducing fuel consumption.
However, it is clearly still more beneficial to reduce pressure drag, regardless of vehicle configuration. The authors of one study concluded that some vehicle combinations can show an increase of 40% in friction drag with only a corresponding increase of 8% in pressure Size: 2MB.