The Steamboating Forum

This is very interesting and impressive. As someone who dabbles in the thermodynamic modelling of engines and other things professionally I think it would be interesting if you shared how it works on the back end - what formulas and calculating procedures were used. I am especially interested in how ...

I always love generic coefficients like mu in that equation.

You might as well throw out the whole equation because without experiment that equation is as useful as the spring equation until you experimentally find your spring constant.

-CB

It is actually quite easy to find mu for generic ports ...

The port area, opening, and design of the ports and valves, in the sense that the coefficient of discharge is always different. There is a semi-empirical formula for the pressure drop given by Strahl. Unfortunately not in SI units but the old kGf based system - thought conversion is trivial. I have ...

This makes sense but...

When is PLAN formula relevant vs your theoretical analysis and vice versa...

-CB

PLAN has little to do with torque, and all to do with power. It is always true, but it does not say much by itself, as mean indicted pressure which is one of the inputs is itself a product ...

It seems like the graph from addiator shows hp going up with rpm.

Look at how power is defined as a physical quantity. It is the amount of work done in an amount of time. The unit itself (kW being a kJ/s) shows it clearly. At zero rpm power will always be zero, because you are doing zero ...

I basically agree to disagree with everyone and I'm half sorry I brought it up. :)

-CB

I would like to ask you, what on earth are you actually asking about. I see every single answer just makes everyone more confused, because you have not defined your problem in clear thermodynamic terms.

In ...

The mentioned PLAN formula is hardly relevant here. There are some other factors to be considered.

In an ideal engine, a torque-rpm characteristic would be flat, and different for any given cutoff. That is to say, the power would proportionally increase with RPM, while the torque should remain ...

Building engines with no castings is actually not that difficult. There is this young man in Poland who had built a few engines not only without castings but initially without a lathe also, I recommend you look into his ideas. His two cylinder engine with Stephensons gear is probably the most ...

Thank you very much for the responses so far. Fredrosse - I am especially interested in that home generation plant, as this is basically what I am trying to do. Or to clarify, I started designing the engine with such objective, before using it as my final project was suggested to me. I would be very ...

First let me introduce myself and my problem. I am a Mechanical Engineering student, who has endeavored to build a Uniflow engine as my final project. I am trying to look at the matter thermodynamically and scientifically in general, however a lack of literature available is making it all a tad ...