| 1. |
- Fureby, C., et al.
(författare)
-
Investigations of microwave stimulation of turbulent flames with implications to gas turbine combustors
- 2017
-
Ingår i: AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting. - Reston, Virginia : American Institute of Aeronautics and Astronautics. - 9781624104473
-
Konferensbidrag (refereegranskat)abstract
- Efficient and clean production of electrical energy and mechanical (shaft) energy for use in industrial and domestic applications, surface- and ground transportation and aero-propulsion is currently of significant general concern. Fossil fuels are mainly used for transportation and aero-propulsion, but also for power generation. Combustion of fossil fuels typically give rise to undesired emissions such as unburned hydrocarbons, carbon dioxide, carbon monoxide, soot and nitrogen oxides. The most widespread approach to minimize these is to apply various lean-burn technologies, and sometimes also dilute the fuel with hydrogen. Although efficient in reducing emissions, lean-burn often results in combustion instabilities and igniteon issues, and thus become challenging itself. Another desired aspect of today’s engines is to increase the fuel flexibility. One possible technique that may be useful for circumventing these issues is plasma-assisted combustion, i.e. to supply a small amount of electric energy to the flame to stimulate the chemical kinetics. Although not new, this approach has not yet been fully explored, partly because of it’s complexity, and partly because of apparent sufficiency. Recently, however, several research studies of this area have emerged. This paper attempts to provide a brief summary of microwave-assisted combustion, in which microwaves are utilized to supply the electrical energy to the flame, and to demonstrate that this method is useful to enhance flame stabilization, delay lean blow-off, and to increase combustion efficiency. The main effect of microwaves (or electrical energy) is to enhance the chemical kinetics, resulting in increased reactivity and laminar and turbulent flame speeds. Here we will demonstrate that this will improve the performance of gas turbine combustors.
|
|
| 2. |
- Raymer, D., et al.
(författare)
-
Sparky flapjack : Electric aircraft design inspirations from the vought V-173
- 2017
-
Ingår i: AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting. - Reston, Virginia : American Institute of Aeronautics and Astronautics Inc.. - 9781624104473
-
Konferensbidrag (refereegranskat)abstract
- This paper presents a design study of electric personal aircraft concepts inspired by the Vought V-173, the famous “Flying Pancake” of late WWII. With its incredible slow flight and short field capability, this innovative design concept may point towards an aircraft suitable for the emerging “Pocket Airport” concept. The paper presents four modern concepts that could offer remarkable capabilities. All use electric propulsion, novel aerodynamics, and integrated composite construction. Four-seater and two-seater concepts have a separate crew cabin underneath the wing allowing for normal entry, unlike the V-173. Another two-seater version was designed with the cabin integrated with the wing root as in the V-173. A recreational one-person “mini” version was also designed with a prone pilot position on top of the wing.
|
|
