large lamina flow build

Discussion on Stirling or "hot air" engines (all types)
derwood
Posts: 113
Joined: Sat Dec 11, 2010 10:15 pm

Re: large lamina flow build

Post by derwood » Sun Mar 06, 2016 6:43 pm

the inner tube is open on the hot end. The pointed end is just pointed for airflow purposes. the point is basically hollow. I wont be sharing the new design, I have too much time invested to just give it away.

Crazyguy
Posts: 61
Joined: Sun Jun 07, 2015 10:39 am
Location: USA

Re: large lamina flow build

Post by Crazyguy » Sun Mar 06, 2016 7:39 pm

Thanks. I hope you are successful. Let us know when its on the market. It wouldnt be revealing any secrets if you share a video.

Crazyguy
Posts: 61
Joined: Sun Jun 07, 2015 10:39 am
Location: USA

Re: large lamina flow build

Post by Crazyguy » Thu Apr 07, 2016 12:55 pm

By the way your video's say it's thermal lag, here you say it's lamina flow. ? ?

Ian S C
Posts: 2184
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: large lamina flow build

Post by Ian S C » Fri Apr 08, 2016 3:03 am

It could also be called a Thermo Acoustic Pulse Engine, I don't think anone knows exactly what to call them. There was one supplied as a kit set called the "Whatisit" engine.
Ian S C

derwood
Posts: 113
Joined: Sat Dec 11, 2010 10:15 pm

Re: large lamina flow build

Post by derwood » Fri Apr 08, 2016 12:46 pm

It is "all of the above". I think the pulse jet principle best describes it. Inertia.

Sjwinslow
Posts: 1
Joined: Fri Apr 15, 2016 5:21 pm

Re: large lamina flow build

Post by Sjwinslow » Fri Apr 15, 2016 6:13 pm

I believe when you look at the design closely it follows the pulse engine (lamina flow) design rather than the thermal lag. Even though many people think they are the same thing there are significant differences both in design and function.

The thermal lag engine is typically designed with a shorter heating tube, contains no regenerator and is heated at the end of the heat tube (farthest from the piston). Its function depends on a the time delay for pressure to increase once temperature is changed as discovered by Tailor in the 60's.

The Pulse Tube or Lamina Flow engine has a longer tube, a regenerator, a pulse tube section and many times a constrictor. The regenerator is located at the farthest point from the piston and heat is applied at the interface of the regenerator and the pulse tube. At the opposite end of the pulse tube next to the piston is where the restrictor is located if needed. This engine functions due to the temperature differential across the pulse tube sets up a standing wave that produces the motive force.

The design discussed here at first doesn't look like either of these descriptions and is what contributes to the confusion. This disign contains a tube within a tube ultimately folding the pulse tube engine in half. Even thouh it looks like the tube is heated at the end like the thermal lag engine, it is actually being heated in the middle due to the folding. In earlier posts by the OP he references the use of a restrictor. Even though lated designs by the OP indicates both the restrictor and the regenerator material are no longer used, their function still exist. When tuned properly this engine can use the pointed part of the inner tube as a functioning restrictor. Many people have built a small test tube engine and made it function without regenerator material. This is because the empty tube can act as a regenerator and the same thing occurs in the OP's engine. The outer tube in this engine is the pulse tube and the inner tube is the regenerator. The length of the tubes are also a dead give away that this is not a TLE as Tailer describes and would cause far too much dead space for it operate as a TLE.

Crazyguy
Posts: 61
Joined: Sun Jun 07, 2015 10:39 am
Location: USA

Re: large lamina flow build

Post by Crazyguy » Thu Apr 21, 2016 5:15 am

I vote this engine derwood designed is the best hot air engine I've ever seen. It's so impressive. I wish he would prony brake it to test the power. I want one.

tibsim
Posts: 34
Joined: Thu Dec 31, 2009 8:54 am

Re: large lamina flow build

Post by tibsim » Mon May 16, 2016 8:12 am


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