Stirlingengineforum.com

zhivko By my calculation you have a heater of 26cm diam which needs to be heated by about the length of the displacer stroke say 15cm, so 26 x Pi x 15 / 10,000 = 0.122 sq mt, 3.5mm gap = 30W/M2/K therefore at 300K, heat transfer into the working gas will be about 1100W. A regenerator will help if th...

zhivko A displacement ratio of 2:1 will be good for the temperatures you intend using but be carefull how you measure this. It is the ratio between the maximum volume in the heater (bore x stroke of the displacer) and the maximum volume in the compression space (piston bore x the maximum gap between...

Ian I know all the SE boat owners in the UK, one, a very large rhombic produces 250W when slightly pressurised the rest produce less than one hundred watts. I for one do not think anything less tham 300W is worth messing about with and given any wind or a stream above 1Knt comsiderably more power in...

Hi Chris Chopper pilot eh, I'm ATPL fixed wing, retired, spent 7 years running a CAD/CAM CNC based precision engineering company from the shop floor as a sub contractor for one of the F1 teams, not formally trained as a machineist but I've picked up a few tricks along the road. Like you, I find the ...

zhivko Save your money, I have a proffesional simulation program that doesn't even agree with a real engine when the data is input. I also have a good friend who has published five books on the Stirling engine and now agrees with me that the only data of value comes from the engine its self. Regardi...

zhivko The main reason it will not run is because the displcement ratio is way out, the displacer stroke must be greater than the piston stroke if the bores are the same. Disconnect the piston linkage, run the burner and turn the engine slowly, you will see that the piston moves much less than the s...

zhivko You certainly have done a lot of work on this engine project, unfortunately the proposed dimensions mean that it will not run at all! The heater, I guess, has about 750 to 1000 sqcm, if the gap is about 1.5mm, the heat transfer will be about 1 to 2watts per sqcm or about 1 to 2Kw but only if ...

Vamoose I'm sorry to say I appear to have caused your thread to be hijacked by a discussion on the use of the English language, not intentional and unlikely to have any influence on achieving a SE that is of use to mankind. I'm sure you are quite wise enough to have understood the advise I was offer...

theropod2 I appear to have hit a nerve, good, I've been mislead for 30 years by authors publishing theories as to how the Stirling cycle functions, it wasn't until I disregarded these learned words and started to bench test every possible aspect of the design that I started to make some progress wit...

Vamoose Sorry to hear that you have also contracted 'The Bug' but you're in good company, so welcome to the Cul de Sac club. Your endevours with an electronic control system may well be of value in the future, my concern is, at the moment, it's rather like trying to optimise the thrust generated dur...

Gentlemen An interesting thread 'electronic optimisation of a Stirling cycle engine power curve' and no doubt many problems to be solved. However the main problem to be solved is not control, but 'how to get these engines to produce some useful power in the first place'. After nearly 200 years, a ne...

Andy Ross used 0.001" foil which when dimpled and wound in the wrong direction form a curve (stroke wise) which largely blocks the passage way. Wound in the other direction this does not occur, it's caused by stresses in the foil due to the dimpling. We use 0.002" foil which resists the te...

Hi Vamoose Maybe........... we are about to run some back to back tests with different regenerator materials, 2thou SS foil, Recemat, and mesh of a very similar size to your Termite mesh (bandage wound), will let you know the verdict. The engine is a beta currently running with SS foil at a fill fac...

Derwood I had hoped we would have heard more from you about your Large Thermal Lag engine by now, I can only guess you are suffering from 'pressure of work'. Some years ago I built a single cylinder TL engine which works very well, but I wanted to investigate whether or not it would respond to being...

Vamoose I'm beging to wonder if you have paid any attention to what I've been saying, you seem more interested in dreaming about water vapour and nano bucky balls or whatever, please consider yourself chastised. You stated early on that you have a heat source with a maximum temperature of 90-180 deg...