I'm designing an enclosure sleeve for the P250-Pro-S. The problem is that there's a supplier delay on the engine delivery, and I need to finish design deliverables and analysis asap, and can't afford to wait more.
I need the outer case/shell temperature under maximum load and operating temperature for my specific use case.
What I've tried so far:
- Calculated radial heat loss given fuel specs and exhaust temp and mass flow. I did a few different estimates under different assumptions (flow based, assuming heat transmission to the nozzle is ideal, etc)
- Applied calculated radial heat loss to a simple CAD replica I made of the turbine. Did lumped estimation, and conjugate heat transfer sims as well.
What I calculated:
- The first few sims got me outrageous temps around the outer shell (4-500C), because I forgot to account for forced convection internally due to airflow.
- My best sims (I hope anyway) got me maximum operating shell temperatures ranging from 158C to 272C. I'm inclined to think that the actual temp would be in the lower ranges of this estimate, 150C to 180C ish.
However, the range is too large, and I'm finally reaching the point where I've spent too much time on this so I thought I'd ask people who have actual experience working with these engines.
Any estimates for the actual shell temperature, or information that will help me tune my simulations would be much appreciated.