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Re: Windscreen impact on stove perfromance

Posted: Sat Jul 10, 2010 7:27 pm
by zelph
The whole concept of pre-heating the air deserves more attention and could yield some great stove designs.
Cold air contains more oxygen. Automotive engine air intakes are located as far away from the engine as possible to insure cold air is taken into the fuel injecting system. Should we have the same goal for stove making? I think air temperature has little significance in the performance of backpacking stoves. Double walled wood burning stoves come to mind. My tests proved to me that there was insignificant effect on the stoves performance compared to a single wall.

Re: Windscreen impact on stove perfromance

Posted: Sat Jul 10, 2010 8:43 pm
by realityguy
Perhaps the air being slowed down with less inlet air should create higher temperatures before it leaves the vicinity of the pot also...Does that make sense?You'll have to excuse me;I'm drinkin' melon margaritas... :lol:

Re: Windscreen impact on stove perfromance

Posted: Sat Jul 10, 2010 10:15 pm
by zelph
just tinkering wrote:I tend to agree with your statements. Inlet air temperature may be a factor (hot or cold) , the angle of approach may be a factor. That is why I think that the Air Barrier concept needs to be explored as I think that there are good things going on this this design.
The second thing that the air barrier does is that it guides the inlet air in towards the stove perpendicular to the flames. I suspect that the flames running out from the bottom of the pot are pre-heating the inlet air going towards the stove. This effect is pronounced on the ACORN and Tea Light stoves and less so on other types. The whole concept of pre-heating the air deserves more attention and could yield some great stove designs.
I would think incoming air would follow the path of least resistance, upward along the sides of the pot.

It's hard for me to envision the flames running out from the bottom of the pot are pre-heating the air. I see the entire air space between air barrier and pot being heated by radiation off the windscreen. This would cause the fuel temperature to rise and rapidly evaporate and burn faster. More fuel being burned would cause a reduction in boil times.

SuperCat stoves burn fast, boil 2 cups in about 4 min. I think they burn in a "radical" fashion :D

Your windscreen concentrates the heat around the pot, adds to efficiency.

I'm still thinking :mrgreen:

Re: Windscreen impact on stove perfromance

Posted: Wed Jul 28, 2010 3:39 pm
by sudden
That was a tease.

Will you test boil times with the various height differences?

Re: Windscreen impact on stove perfromance

Posted: Wed Jul 28, 2010 3:54 pm
by zelph
Without the air barrier longer to boil but more fuel efficient?

It was interesting to see the effect the barrier height had on flame shape............let's call the barrier a "shape shifter" :mrgreen:

Thanks for the interesting video, I enjoyed :D

Re: Windscreen impact on stove perfromance

Posted: Wed Jul 28, 2010 8:52 pm
by ShakeyJke
NA

Re: Windscreen impact on stove perfromance

Posted: Wed Jul 28, 2010 9:10 pm
by DaddyMnM
It appears to me that the different heights change the surface area of the stove that is exposed to radiant heat. The higher position appears to be a cooler flame perhaps because the stove is not getting as much heat radiated back into the stove thus reducing the rate of alcohol vaporization.

Re: Windscreen impact on stove perfromance

Posted: Wed Jul 28, 2010 9:45 pm
by ShakeyJke
NA

Re: Windscreen impact on stove perfromance

Posted: Thu Aug 05, 2010 8:52 pm
by zelph
Stability is overrated, some system level testing is overratted.





Just kidding, glad you were able to finalize your testing. Great results, super looking stove :D :D Nice job on the wick tube.