Futterama
Computer
- Jul 18, 2018
- 5
Hi, I hope this is the correct subforum.
I'm designing and building a radial fan for a hobby project. The goal was to deliver more air than a radial fan for pumping up air mattresses when consuming the same amount of power. By "more air" I mean higher volume and pressure. The power is given to be 20W.
So far my design seems to surpass the mattress pump. I'm using a clear tube with water to compare the fan performance, I guess this only shows air speed and hence air volume considering the fan outlets are of equal area.
Can I use this simple method to measure pressure as well? I'm having a bit of a hard time understanding the term "static pressure" and what it covers. Is it the pressure the fan can put into a closed system, like if I block off the fan outlet?
When the fan is running, it produces a high pitch noise that I would like to lower a bit in amplitude. It is powered by a brushless motor, same type that is used in RC drones. Running the motor without the impeller does not produce much noise at all, so the high pitch noise must originate from the radial fan.
What kind of changes should I experiment with to reduce overall noise? Since it's is 3D printed in PLA, it is easy to make changes but I don't know where to begin - inlet shape, impeller shape, housing ect.
The brushless motor is mounted in the fan inlet, to allow for motor cooling. The motor diameter is 17.6mm and the inlet diameter is 23.5mm. This gives a clearance area between motor and fan housing of 190mm². The fan outlet is 13x13mm = 169mm². Does this sound OK or do I need bigger or smaller fan inlet for the outlet size?
I have no calculations to support my design, I only have pictures of fan designs from the internet.
A feature I would like to implement is a closed shape impeller, but that would be hard to 3D print with my printer. So I attempt to make the clearance between impeller and housing as small as possible, I'm aiming for 0.5mm.
If there are any obvious flaws in my design, please let me know.
I have attached a 3D drawing of the fan. Please note that the bottom of the housing seems to be open, but I have a lid for that, it is only to make room for the motor axle.
Thanks.
I'm designing and building a radial fan for a hobby project. The goal was to deliver more air than a radial fan for pumping up air mattresses when consuming the same amount of power. By "more air" I mean higher volume and pressure. The power is given to be 20W.
So far my design seems to surpass the mattress pump. I'm using a clear tube with water to compare the fan performance, I guess this only shows air speed and hence air volume considering the fan outlets are of equal area.
Can I use this simple method to measure pressure as well? I'm having a bit of a hard time understanding the term "static pressure" and what it covers. Is it the pressure the fan can put into a closed system, like if I block off the fan outlet?
When the fan is running, it produces a high pitch noise that I would like to lower a bit in amplitude. It is powered by a brushless motor, same type that is used in RC drones. Running the motor without the impeller does not produce much noise at all, so the high pitch noise must originate from the radial fan.
What kind of changes should I experiment with to reduce overall noise? Since it's is 3D printed in PLA, it is easy to make changes but I don't know where to begin - inlet shape, impeller shape, housing ect.
The brushless motor is mounted in the fan inlet, to allow for motor cooling. The motor diameter is 17.6mm and the inlet diameter is 23.5mm. This gives a clearance area between motor and fan housing of 190mm². The fan outlet is 13x13mm = 169mm². Does this sound OK or do I need bigger or smaller fan inlet for the outlet size?
I have no calculations to support my design, I only have pictures of fan designs from the internet.
A feature I would like to implement is a closed shape impeller, but that would be hard to 3D print with my printer. So I attempt to make the clearance between impeller and housing as small as possible, I'm aiming for 0.5mm.
If there are any obvious flaws in my design, please let me know.
I have attached a 3D drawing of the fan. Please note that the bottom of the housing seems to be open, but I have a lid for that, it is only to make room for the motor axle.
Thanks.