centrifugal compressor torque negative - using cfx for simulation
 

Hi everyone,

I had setting
Inlet: Total Temperature: 300K; Total Pressure:1atm
Outlet: Static Pressure 1.9atm
Rotational Speed: -60000rpm
I had found that my torque is negative. What condition should i setting of exchange?
Attachment 64341

Attachment 64342

Make sure you understand the negative torque - what axis is it defined from? Negative torque could mean in the direction of rotation or against the direction of rotation depending on the definition.

Assuming it is in the same direction as the direction of rotation: Then the rotor wants to run at a faster speed and is trying to accelerate. The steady state speed will be faster than the speed you simulated.