indeterminatedesign
commented
3 years ago I don't know enough about vanes to really speak to them. It's my understanding that properly designed vanes ultimately increase the efficiency of a compressor, but they narrow the effective operating window for the compressor. This is why you don't see them in automotive applications where the load is variable, and if you do see them the vanes are moveable.
The issues with the compressor wheel are down to the operating range and the housing. To produce a significant pressure ratio that wheel needs to be spun at something like 60,000 rpm with a 1500-2000 watt motor. It just flows too much air. The new compressor I'm working on is much smaller in size, has a variable back sweep angle, and a different blade design entirely.
The housing also did not have a large enough diffuser section, the flat area between the turbine and the volute. Also the volute is the wrong shape for optimal flow and is too large in diameter everywhere.
Unfortunately printability will always be an issue with the housing. I used tree supports and low layer heights. The issue I had with mine was the wheel contacted the housing when spinning. It's very difficult to achieve a consistent 0.5mm radial clearance.
On Sat, Feb 27, 2021 at 2:53 PM SerialIterator notifications@github.com wrote:
I printed the compressor and the housing and while the wheel came out fine the housing needed pretty elaborate supports that left a pretty mangled surface for the wheel to come near which needed a lot of manual touch up. Is this what you were talking about wanting to fix? I'd like to modify it to work more like a dyson fan where its routed from radial to axial around the motor to cool it. I tore apart my old dyson stick vacuum to see how their motor works and instead of the snail housing, it's a 2 part shell with 2 sets of wind vanes (diffusers?) to guide the flow. You mentioned in the video adding some guides like this to a prototype, what does that do to the output?
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I printed the compressor and the housing and while the wheel came out fine the housing needed pretty elaborate supports that left a pretty mangled surface for the wheel to come near which needed a lot of manual touch up. Is this what you were talking about wanting to fix? I'd like to modify it to work more like a dyson fan where its routed from radial to axial around the motor to cool it. I tore apart my old dyson stick vacuum to see how their motor works and instead of the snail housing, it's a 2 part shell with 2 sets of wind vanes (diffusers?) to guide the flow. You mentioned in the video adding some guides like this to a prototype, what does that do to the output?