What's the highest compression ratio that I could get out of a plastic compressor? I want to 3D print a centrifugal one. I intend to put this value into pic related in order to find out what flow rate I can get from a given power input. My book said centrifuges compress air isentropically so I worked with that.
>My book said centrifuges compress air isentropically so I worked with that.
they don't. thats a simplifying assumption made for intro thermodynamics classes. you haven't gotten to the part about isentropic efficiency yet.
designing turbomachinery to spec is hard m8. you are better off just slapping something together in solid works with a 45 degree vane angle and figuring shit out empirically.
ie, build it first, then sort the math out based on what you have.
Tell me more, my book says nothing about this.
> figuring shit out empirically.
Of course I'll take readings from the finished product but I need to know if it's feasible first before building anything. 3D printing filament is actually quite expensive, ball bearings even more so. Just need a rough idea
>Tell me more, my book says nothing about this.
pretty much every thing you are learning is an approximation. in practice there are a million little empirically derived constants you have to find in a chart somewhere if you want your numbers to be accurate enough to build a machine that gives you specific outputs.
so look, man. i'm guessing you are an engineering student, so i'm going to tell you how an engineer would figure this out.
build the fucking thing in solidworks, then run it through the flow simulator with whatever goals you want set up. this is standard cubicle jockey shit.
>pretty much every thing you are learning is an approximation
Yeah I gathered this a while ago. Ironically the book I'm using is a cubicle jockey's engineering data book and it has pic related in it, is that more relevant?
>solidworks, then run it through the flow simulator
I am not a student therefore I can't afford solidworks (no discount), I use a budget CAD with no CFD capability. I tried to learn CFD (openfoam) for this ducted fan I was making but it was arcane as fuck, literally all coding so I've been sticking with library books since then. Just as you said it boiled down to plugging empirical airfoil constants into a simple equation. CFD isn't very retard-friendly.