I'm diving into SW Flow Simulation, and created simple radial fan model as a first project. I've made basic calculations,.. and

I need your help Looks like I have an error in model, calculations or flow settings.

I've got the efficiency of my backward curved impeller as of ~25% ? A lot of tutorials says that it should be 80+%.

Besides the overall efficiency, very important for this study is intake pressure (suction power, SG Av Dynamic Pressure) - it is also very low for such type of impeller

Here is .zip with the assembly, parts and sim. results.

https://drive.google.com/file/d/1qlFtU1AoQCCpz8wkfVN6PZr-l4xTf4s8/view?usp=sharing

Here is the screenshot+my calculations (are they right?)

Can you point on my fault?

Thanks in advance for any help !!