scarbs wrote:Yes, but you are losing the taller\longer centre tunnel, this at 30cm wide x 80cm long x 40cm high, is a significant loss in all dimensions. The result will be a diffuser smaller in volume and exit area, but with a far steeper angle of attack (21-degrees)...
A Loss is what is desired i think since we want less coupling anyway, what is important is to see if the turbulence will be greater.
here is a couple of facts to consider:
1/The step floor extend from 330 behind FWCL to the RWCL opposed to now with 330 behind FWCL to 330 ahead of RWCL.
2/The full 50cm width, from RWCL to 330 behind it is authorized to go below the RP as opposed to 30cm now.
3/opposed to the actual lateral parts of the diffuser the steep angle will be greater.
Okay, 1/ would lead to a higher mass flow...but as john beamer told us, the use of vortex generators to prevent breakdown being limited next year we don't know..i presume they want the same mass flow.
2/makes assuming that the mass flux (mass flow per unit area) will be lower than in the lateral parts and/or the central part.
3/is interesting..there's more pressure recovery here (but will mass flow be higher???) but in the central area i think the actual pressure recovery gradient is about the same.
So all in one i think the efficiency will be about the same, just that you will probably have less mass flow so as johnbeamer said, i think the diffuser will have less wake and less turbulence.