In FLT method of dimension we take F(Force), L(Length) and T (Time ) as standard dimension and find the dimension of other quantities in terms of FLT
Here pressure difference is function of diameter of blade(D), Angular rotation(), density of air ( ) and the flow (Q).
Now here equate the dimension of the above quantities in terms of FLT
now equate the dimension of all the quantities in above equation
On comparing with the dimensions of the above quantities we can say that
on comparing the power of dimension we can say that,
so from here we can say that the relation is as follows