@keyur, I did that there are two ways, how can I do

1st Way: I start meshing from the outer and then go inward, I use the 3 type of compenent meshing, Sweep meshing, edge meshing and for thickness I use again the edge meshing. (like I need 10 elements). and I mesh the trapz Inlet as well in the same way, and move towards the interior. The time When I reach at the segemented inner circle, I start to lose the control of meshing any changes here can cause the distrotation in the whole mesh. 

2nd way: I did was doing from inside but the mesh at the trapz inlet become not so good and distorted as well. Really lead me bit frustrated its just simple geometry.