Breaking News
Design How-To

A design to generate UAV electrical power in flight

NO RATINGS
Page 1 / 3 Next >
More Related Links
View Comments: Oldest First | Newest First | Threaded View
Page 1 / 2   >   >>
DrFPGA
User Rank
Blogger
re: A design to generate UAV electrical power in flight
DrFPGA   6/6/2012 4:39:09 PM
NO RATINGS
Thanx for the details on the mechanical, electrical and thermal aspects of the design. Too often we only see one aspect, and in this case the interactions were very critical.

prabhakar_deosthali
User Rank
CEO
re: A design to generate UAV electrical power in flight
prabhakar_deosthali   6/7/2012 7:11:27 AM
NO RATINGS
This idea of harvesting the waste energy is really good. By seeing the roof top mounting of this generator, I thought - why cannot be a wind energy convertor be installed for generating electricity? When the vehicle is cruising at some constant speed , we will be able generate a stable voltage using a small wind mill. It should also be possible for Helicopters to harvest energy from their big rotating blades

@NEALETHOMASnet
User Rank
Rookie
re: A design to generate UAV electrical power in flight
@NEALETHOMASnet   6/7/2012 10:46:06 AM
NO RATINGS
Amazing that this thing got editorial endorsement considering its amateur adoption of aerothermal analysis relying on CFD (C=Contrived) that cannot conceivably capture complexities conveyed in pictures, not just unfaired facets of equilibrium orientation but more importantly abrupt departures encountered as gust response never mind comment "curl back very symmetrically" without conceding punitive loss factor in all U-turned flow. Reinforced by remarks on meagre recovery energetics from chemical potential unqualified by reference to maximal reality cap 40-50% dictated by law of diminishing returns aka 2nd Law! It's a software sales pitch for a caricaturisation code, one of many in the market and all liable to mislead inexperienced individuals when used away from calibration closure conditions, almost invariably inevitable when any complexity is encountered. I've seen consequences at first hand following fatal accidents when commissioned to critiquise such code variants adapted as nuclear and hydrocarbon safety simulators, also persistence of flawed scalings for years after errors and omissions were documented in more sophisticated literature. Overall then, worth no more than gamma as an auldskule english engineering finalist hons project! @NEALETHOMASnet

arturi
User Rank
Rookie
re: A design to generate UAV electrical power in flight
arturi   6/7/2012 10:53:11 AM
NO RATINGS
prabhakar, as soon as current starts to flow the rotating blades have to overcome a magnetic field and therefore the mechanical resistance is magnified. Hence more fuel is consumed. There's no free lunch there.

jeremybirch
User Rank
CEO
re: A design to generate UAV electrical power in flight
jeremybirch   6/7/2012 1:51:02 PM
NO RATINGS
This system is trying to generate electricity from waste heat in the engine exhaust - not from the force of the "air" flow in the exhaust. The system was originally only 20% efficient meaning 80% was lost as heat, and some fraction of that is in the exhaust, say 30% of the overall energy. This system can capture 5% of that ie 5% of 30% which is only 1.5% of the total energy in the fuel. So at best this raises the thermal efficiency to 21.5%. As the heatsinks etc weigh quite a lot this in itself might increase the fuel consumed. I am not convinced at this level of energy extraction that it has much merit over having a generator linked to the shaft. Presumably these are TEG's are using the Peltier effect? There may be much more efficient ways to extract energy eg using Sterling engines etc

bharat solanki
User Rank
Rookie
re: A design to generate UAV electrical power in flight
bharat solanki   6/8/2012 2:48:35 PM
NO RATINGS
i think in car, also we lost good amount of heat energy, instead of wastage something for that also can be done...

katgod
User Rank
Rookie
re: A design to generate UAV electrical power in flight
katgod   6/13/2012 3:25:20 PM
NO RATINGS
Yes, precisely my thought also.

Kevin.Jackson
User Rank
Rookie
re: A design to generate UAV electrical power in flight
Kevin.Jackson   6/13/2012 8:07:08 PM
NO RATINGS
I've had an interest in this approach to energy harvesting for years but Peltier devices are particularly difficult to deal with from a design standpoint (not to mention a little pricey and very inefficient). I'm happy to read of this research. I expect higher temperature devices may come out of it, which would expand the potential applications of these interesting devices.

Kevin.Jackson
User Rank
Rookie
re: A design to generate UAV electrical power in flight
Kevin.Jackson   6/13/2012 8:11:42 PM
NO RATINGS
When I was nine I connected a motor's shaft to a generator and wired the generator's output to the motor. With great anticipation and excitement, I wrapped a rope around the shafts and gave it a good tug. While the shaft rotated a little longer with the wires connected than without, I clearly didn't have the perpetual motion machine I had imagined. Some years later I learned why.

Paulo540
User Rank
Rookie
re: A design to generate UAV electrical power in flight
Paulo540   6/14/2012 12:11:15 AM
NO RATINGS
I am curious what the NET power output difference is between the untouched 2-stroke motor and the one with exhaust mod... Generally, cooling off exhaust, especially of a motor with very specific exhaust parameters, will change the powerband. Speaking of motors, why no 4-stroke?

Page 1 / 2   >   >>
Flash Poll
Radio
LATEST ARCHIVED BROADCAST
EE Times editor Junko Yoshida grills two executives --Rick Walker, senior product marketing manager for IoT and home automation for CSR, and Jim Reich, CTO and co-founder at Palatehome.
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Top Comments of the Week