I would greatly appreciate any insight into this.
I'd like to place a ducted fan inside of a box with the bottom cut out. The fan is attached to the sides of the box by support rods. The ducted fan pulls in air from the top of the box and accelerates it towards the opening at the bottom, as shown in the attached picture.
My question is, how big should the dimensions of the box be in order to match the thrust of an unenclosed fan? is there a simulation approach I can take to better understand how the box's size and the placement of the fan affect thrust, without going full-blown with CFD?