Search found 308 matches

by Aviator168
Thu Mar 30, 2017 6:29 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: 2 KWh LTD Stirling Engine
Replies: 26
Views: 11682

Re: 2 KWh LTD Stirling Engine

So I have finally discovered the inner working of the Sunpulse Stirling Engine. https://www.youtube.com/watch?v=mpBa0ntXANI&feature=share No magic there. The trick to LTD stirling is to have very very large exchange area, lots of working fluid, and minimum amount of non-working fluid. P.S. In my bo...
by Aviator168
Mon Mar 06, 2017 4:06 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: What a difference a flue makes! +75%
Replies: 15
Views: 4732

Re: What a difference a flue makes! +75%

Don't know if you can do this. Use an up-side-down flame. Steam car engines use that scheme.
by Aviator168
Sat Mar 04, 2017 9:04 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: What a difference a flue makes! +75%
Replies: 15
Views: 4732

Re: What a difference a flue makes! +75%

Yes. The flue increases the velocity of the hot air which increase the Reynolds number which increase the effective thermal transfer capability per unit area.
by Aviator168
Mon Feb 20, 2017 11:34 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Pressurization
Replies: 20
Views: 6479

Re: Pressurization

I worked out all the numbers. Pressurizing the crank case would not increase the power of the engine. However, it does lighten up the loads of the bearings, cranks, and the connecting rods. It also reduce torsional vibrations greatly.
by Aviator168
Sun Feb 19, 2017 11:35 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heater & Regenerator Design
Replies: 60
Views: 16166

Re: Heater & Regenerator Design

My notes show about .0075" as a cut-off point where cost and pumping losses are too high.
That's what I have come up with. About 200 micro
by Aviator168
Sun Feb 19, 2017 11:23 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Pressurization
Replies: 20
Views: 6479

Re: Pressurization

I've tried to pressurize a few open crankcase engines, the limit was when the energy in the flywheel could no longer over-come the energy needed to compress the gas again. That's the true reason to pressurize the crankcase. Now if those engines were multi-cylinder designs like an IC with super char...
by Aviator168
Sat Feb 18, 2017 9:16 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Pressurization
Replies: 20
Views: 6479

Re: Pressurization

OK. Have been thinking. There is really no need to pressurize the crank case for an alpha engine. I understand what Ian is saying. But the issue here is the operation is not that much difference with or without pressurizing the crank case. It is just like a IC with a super charger or a diesel with 5...
by Aviator168
Fri Feb 17, 2017 12:15 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heater & Regenerator Design
Replies: 60
Views: 16166

Re: Heater & Regenerator Design

The slot size is very important: too narrow and you increase pumping losses, too wide and you increase dead space and you loose the turbulence needed in the slots/tubes. The slot size is just one the variables in heat transfer. The other variables are kinematic viscosity which has to do with densit...
by Aviator168
Fri Feb 17, 2017 4:31 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heater & Regenerator Design
Replies: 60
Views: 16166

Re: Heater & Regenerator Design

This is the doc for steel under high heat. You can find for other material on the net.
http://citeseerx.ist.psu.edu/viewdoc/do ... 1&type=pdf
BTW. The way you made the cylinder, the wall can be very thin to take on 15 bars assuming the temperature is not too crazy.
by Aviator168
Thu Feb 16, 2017 5:52 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heater & Regenerator Design
Replies: 60
Views: 16166

Re: Heater & Regenerator Design

What pressure are you planning to run the engine in? The wall seems to be very thick.
by Aviator168
Thu Feb 16, 2017 2:50 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Disappointing
Replies: 34
Views: 10619

Re: Disappointing

That's the paper I sighted. For all intend and purposes, the authors did not use a efficient burner for the study. The nasal report indicated the mod ii had an over all efficiency of more than 36% which I think is pretty good.
by Aviator168
Tue Feb 14, 2017 7:12 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Disappointing
Replies: 34
Views: 10619

Re: Disappointing

A professor has that solved and he demonstrated it. Just needs development money to mass produce. It also produces more power as it can be a lithium metal battery rather than lithium ion. Saw that program. One very important thing they have not address is the charging time. As a matter of fact, the...
by Aviator168
Thu Feb 09, 2017 6:33 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Disappointing
Replies: 34
Views: 10619

Re: Disappointing

The Tesla uses < 20kw if it is driven at 60mph. An 30kw to 40kw stirling-electric hybrid can definitely compete with gas engine cars, and probably even the Tesla. No need to build a Mod II size engine.
by Aviator168
Thu Feb 09, 2017 9:36 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Pressurization
Replies: 20
Views: 6479

Re: Pressurization

Both the hot and cold make power. Remember that the pressure change in one cylinder affects the WHOLE system.
by Aviator168
Wed Feb 08, 2017 4:06 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Disappointing
Replies: 34
Views: 10619

Re: Disappointing

OK. Thank. I know about that stirling engine on the AMC. It had a pressurized burner and huge amount of dead space. The centrifuge pump that pressurize the burner is as big as the burner itself if not bigger, and the huge amount of dead space requires very high mean pressure in the working fluid.