Hello once again,
Im working on a wing for FSAE car, eventually there is going to be a DRS system, so Im trying to achive as much downforce as possible without bothering about drag increasement. It’s my first aerodynamic project so please help me understanding my results. Wing is designed by me, wing profiles I took from MSHD study. Here’s the link: https://www.simscale.com/workbench/?pid=6093534128222503623&mi=run%3A1%2Csimulation%3A7&mt=SIMULATION_RUN
I’ll summarize what Ive already done:
- base geometry have been simulated giving aprox. 274 N of downforce and 96 N of drag, here are the velocity and pressure gradients:
I can see big stagnation bubble on the main plate. I think that theres no flow separation on the upper plate meaning that I can increase top AOA. Also I suppose that gap between the plates is too small. Now it is 1,6% of main chord. Main plate is 0 degree and top is 45 ( I have force plots for both of them)
- Ive made the gap 3%, it didnt affect the results much, 3N more of Fz and 2 of Fx.
- Ive increased main plate AOA by 4 degrees, top stayed the same, gap 3%, after that there were some big changes: 334,5 of Fz and 126,5 of Fx. Here are the screens:
I think that the bigger gap allowed better flow. There’s no such big velocity stagnation. Negative pressure area stays bonded to the top profile higher than before (I suppose its a positive phenomenon). Also pressure on the top side is higher.
- Ive made 3 simulations increasing top plate AOA, 47,49,51 degrees. Forces were gradually rising up to 358 of Fz and 133,2 of Fx.
I can see velocity rising on the bottom side and whats connected pressure dropping. I think that low pressure area on the top plate is slight lower than before ( Is it a sign of flow starting to separate?). Particles trace show the flow bounded. My next idea is to make endplates bigger, according to a formula to increase Aspect Ratio. Can you help me analyzing those screen shots and give me some ideas what to change? Sorry for the long post and thank you for your time.