Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Relationship between body pressures on the rear panels and the base pressure

JulianEdgar · 12-31-2020, 05:58 PM

Rob Palin had a lot of interesting things to say regarding this topic (so now all my experts have got back to me).

In short, he took elements from what they other experts had said, and then fleshed them out in more detail.

My summary is this:

1. There is no simple, pat answer as to what influences base pressure on different cars.

2. Therefore, without testing, you're working very much in the dark as to the effectiveness of modifications.

3. Higher pressures on the side of the car, especially towards the rear, will likely increase base pressure. (And my testing clearly shows that higher side pressures occur with better flow attachment.)

4. Thick boundary layers towards the back of the car will likely increase base pressure.

12-31-2020, 05:58 PM	#15 (permalink)
JulianEdgar Banned Join Date: Nov 2017 Location: Australia Posts: 2,060 Thanks: 107 Thanked 1,607 Times in 1,137 Posts	Rob Palin had a lot of interesting things to say regarding this topic (so now all my experts have got back to me). In short, he took elements from what they other experts had said, and then fleshed them out in more detail. My summary is this: 1. There is no simple, pat answer as to what influences base pressure on different cars. 2. Therefore, without testing, you're working very much in the dark as to the effectiveness of modifications. 3. Higher pressures on the side of the car, especially towards the rear, will likely increase base pressure. (And my testing clearly shows that higher side pressures occur with better flow attachment.) 4. Thick boundary layers towards the back of the car will likely increase base pressure. Last edited by JulianEdgar; 12-31-2020 at 08:03 PM..