Akkupack
New member
Edit: I'm updating this project as time goes. The essence of a multi-staged EDF still remains, however things continue to change from what I've typed below, as I adapt my design changes and improves to perfection.
So I have an aluminium tube which I'd like to use as a nacelle for a self made EDF. The tube is about 25mm inner diameter and about 100mm in length. It's sturdy and light and I really like it, so that is why I want to use it. I'm using a FDM printer to make multiple stages of rotors and stators with decent quality. The shaft (massive center of the rotors, not the axle) of the setup is about 15mm in diameter which is quite thick, but that is as thin as my bearings allow atm. The questions I have are:
1. How should I shape the rotor blades? The rotors push the air while the stators stop the air from spinning, and I have designed the stators accordingly. The rotors will have a regular fan shape and so I'm wondering if I should have the rotors increase their blade pitch as the air flows towards the exhaust, this way incrementally increasing the speed of the air, or if I should start out with high pitch rotors and keep them all at the same pitch and since there are a lot of rotor stator stages, the pressure difference created will be enough to create a decent airflow.
2. Is the long nacelle and multiple stages worth it for the increased airflow or is it just too inefficient to justify the effort and I should just stick with a little, at most 2 stage ducted fan and it will be better, even with the same motor?
My goal here is to make a small turbojet-like thruster (not an actual turbojet, just a long EDF) which may end up on a small, 30-40cm wingspan plane. Due to the high pressure difference that I think this design can create, I'm thinking about also adding a nozzle to increase the speed of the air, but I'm not sure how much will all this stress the motor.
So I have an aluminium tube which I'd like to use as a nacelle for a self made EDF. The tube is about 25mm inner diameter and about 100mm in length. It's sturdy and light and I really like it, so that is why I want to use it. I'm using a FDM printer to make multiple stages of rotors and stators with decent quality. The shaft (massive center of the rotors, not the axle) of the setup is about 15mm in diameter which is quite thick, but that is as thin as my bearings allow atm. The questions I have are:
1. How should I shape the rotor blades? The rotors push the air while the stators stop the air from spinning, and I have designed the stators accordingly. The rotors will have a regular fan shape and so I'm wondering if I should have the rotors increase their blade pitch as the air flows towards the exhaust, this way incrementally increasing the speed of the air, or if I should start out with high pitch rotors and keep them all at the same pitch and since there are a lot of rotor stator stages, the pressure difference created will be enough to create a decent airflow.
2. Is the long nacelle and multiple stages worth it for the increased airflow or is it just too inefficient to justify the effort and I should just stick with a little, at most 2 stage ducted fan and it will be better, even with the same motor?
My goal here is to make a small turbojet-like thruster (not an actual turbojet, just a long EDF) which may end up on a small, 30-40cm wingspan plane. Due to the high pressure difference that I think this design can create, I'm thinking about also adding a nozzle to increase the speed of the air, but I'm not sure how much will all this stress the motor.
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