Search found 6 matches

by omblauman
Wed May 09, 2018 9:10 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Isothermal Models comparison
Replies: 0
Views: 1305

Isothermal Models comparison

I was curious to see what a simple isothermal model would predict for my S engine, i am talking about the often called Schmidt analysis Looking on the web I found a few web page, or spreadsheet, calculators which have the machinery in place to calculate all relevant parameters and are free: 1) Herzo...
by omblauman
Fri May 04, 2018 2:40 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: two displacers and one double acting work piston
Replies: 0
Views: 1213

two displacers and one double acting work piston

I am looking for examples of Stirling engines which power one double acting piston with two oppositely phased displacers. One known case is Jim Dandy's #6 http://www.starspin.com/stirlings/jimd6.html Another one seems to be the river paddle boat Heiland Lad http://www.stirlingengines.org.uk/boats/in...
by omblauman
Sun Apr 29, 2018 3:51 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: A Stirling theory question on average pressures
Replies: 5
Views: 1873

Re: A Stirling theory question on average pressures

About snifter valves nobody seems to indicate what the pressure threshold for opening is and what is the negative excursion of the engine pressure. An ideal snifter valve, that is a valve which would open with an infinitesimal negative pressure difference and of negligible inertia, seems to me that ...
by omblauman
Sat Apr 28, 2018 2:19 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: A Stirling theory question on average pressures
Replies: 5
Views: 1873

Re: A Stirling theory question on average pressures

Thanks Alfista, very interesting.Do you have a reference for the snifter valve article? To my intuition the nearest the average pressures of the carter and the engine are the easier should be for the engine to run. By easier I mean reduce the torque fluctuation, make it rely less on the flywheel to ...
by omblauman
Sat Apr 21, 2018 9:37 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: A Stirling theory question on average pressures
Replies: 5
Views: 1873

A Stirling theory question on average pressures

In a Stirling engine there will always be small but finite leaks in the work piston seal. In steady state the average internal pressure will unavoidably reach an equilibrium with the steadier carter pressure. In an atmospheric engine the average internal molecular density will be lower than atmosphe...
by omblauman
Thu Apr 12, 2018 10:17 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: "Hi...We are new here!" First posts here (or anywhere is OK)
Replies: 438
Views: 153523

Re: "Hi...We are new here!" First posts here (or anywhere is OK)

Hi I am a retired physicist living in venice Italy, if you ever pass by please call in, will talk about Stirling engines or this fascinating city where I now live, Oscar