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Flow rate, now this is going to be a mess. I don't believe measurements need to be taken at exact flow rates, but whatever the flow rate used, it must be measured accurately. If enough data points are taken at various flow rates, an accurate enough curve should be able to be produced. Simple yet accurate flow meters could be used I suppose. Problem is, accurate flow meters are not exceptionally cheap. I do feel strongly that the 'fill the bucket and time it' methods are not acceptable and should not be used for accurate measurements, especially at lower flow rates where there is substantial variance.
On a side note for Tecumseh, almost any 3D modeling software worth its beans will output IGES files which is what CNC machines need to do their work.
For the record, I'm spending most of my spare time working on numerical models to help better understand the effects of different designs, flow rates, induced turbulence, etc. I've not had any time to work on any empirical testing of my own just yet, and may never be in the best position to do so anyhow. Give me numbers and I'll crunch them, if I can weasel in any extra time I'd love to work on some real world testing.
Flow rate measurment will be a mess. I have looked into various
flow sensors and guages available for the rates we will need
and none of them seem accurate enough. But, before I forget,
are we only going for WB testing? What about HSFs?
Is it universal that CNC machine software can take an IGES
file and convert it to its native format? Since IGES is a loose
group of standards or poorly enforced, how reliable is this
I'm glad you are working on your numerical codes, so if you are
like me you'd love to have loads of high-quality empirical data
to compare against.
almost any 3D modeling software worth its beans will output IGES files which is what CNC machines need to do their work.
Most newer CNC machines do quite well with IGES files. I've seen a few problems with them, but most knowlegable machinists can overcome them easily.
By the way, anyone suggest you just use a standard 100W (or 150W) filament lamp bulb in a standard heinz baked bean can, bolted to a wood block ANYONE can get hold of those parts, that would be a real basic and accessible test. Cost less than $5. Temps to be taken from a standard "sandwich" self tapped to the top of the can with 4 screws, which could be a specified thermistor from a major manufacturer and taken and quoted as the resistance of this with a standard multimeter. This should be made from aluminum, easier to get hold of, be the dimensions specified, for top plate bottom plate and U shape middle plate cutout for thermistor, which should be glooped in with fresh standard zinc oxide thermal compound. That seems to me a real simple and accessible solution for everyone here to use, not just those that want to spend $$$ and have the skills and want to review professionally.