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Adjusting fins on the diffuser part
denis_ageev
Member Posts: 4 EDU
Im currently working on the design of the turbojet engine that is custom built, and Im going to get the files ready for CNC for "Proof of Concept" for now, but I am trying to make the diffuser look right.
I attached two screenshots, one shows the top view of the diffuser (unmarked) and the other one shows the diffuser from the bottom plane (marked up). I used the chamfer feature to thin out blades at the bottom but I realized that it did not quite work right because I want the tips of the blades to be equally thin (instead it made the tips thinner on the edge where it connects to the part.
Additionally, I am trying to add a little "bend" to the tip of that fin to direct air flow in the circular direction but it does not work the right way or does not work at all.
Link to the file (I made a copy of it specifically for reddit as well) : https://cad.onshape.com/documents/6dcd84e8413660d2b76f09fa
Thank you sincerely whoever can help!
Best Answer
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muhammad_tayyab_arif
Member Posts: 13 ✭
Try using loft feature with guides and three cross-sections (Start, middle and end) this will solve your issue if i understand your issue correctly 😅
(Also, your link is not working)
1
Answers
Try using loft feature with guides and three cross-sections (Start, middle and end) this will solve your issue if i understand your issue correctly 😅
(Also, your link is not working)
Can you provide an image that might show an example of what your trying to do?
Is this kinda what you're looking for?
https://cad.onshape.com/documents/2605e00604ddef7a0a48f7f2/w/6414266cc92f90c049b939d9/e/7e0f4763b97c6361fe11db3c
I actually did end up using the Loft feature! but I ended up figuring it out like a week after I posted. Nonetheless, thank you very much for your guy's help. I didn't think I'd get a response here. But the attached screenshot is the final look of what this part looks like :)
I got a small channel in which I'll be running tubing to supply oil to bearings and shaft of the engine, and obviously added some holes for screws to hold the diffuser attached to the shaft casing. And as you can see I now have a perfect curvature feature that I was looking for.
P.S. the primary feature of the diffuser is to slow down air inside the chamber, but also give it a spiral momentum so the mix of the air and fuel will be fairly even. This can be achieved by giving the fins a "diagonal" feature (as shown) but also making the space between the fins in the entrance smaller than by the "exit" area. Note for those who aren't familiar with diffuser: Its tightly encase, so the air follows these "routes" only and nowhere on the outside
Please see my latest comment, I already have a final model of that precise piece :)