Pitch angle for side 1 and 2

- August 2, 2019 at 8:24 pm
  
  abbas
  Subscriber
  
  Hello every body,
  
  I am working on turbine and I am confused about Pitch angle for side1 and 2. What does it mean?
  
  This is the domain that I uploaded in here. The first picture shows the stator and the second picture shows the rotor. I want to simulate half of
  
  the geometry. This is a Tesla turbine. So, I use the Frame Change/Mixing Model with Frozen Rotor. In Pitch Change Options, there are some options but the automatic doesn't work and I have to choose the Specified Pitch Angles. So what does it mean and what angles should I choose.
  
  Best regards
  
  abbas
- August 5, 2019 at 5:17 am
  
  Amine Ben Hadj Ali
  Ansys Employee
  
  By default, pitch ratio is computed as simply the area ratio of side 1 and side 2. So ideally one only changes in Theta direction. Realistically that differs from one but you need to provide a value near to one as in the axial turbine tutorial.
- August 7, 2019 at 6:49 pm
  
  abbas
  Subscriber
  
  Thanks for your help. However, what would be the pitch in my case, because, for my case, the disk which is a rotor is rotating and if I correctly understand your words, it means that the pitch ratio should be 1?
  
  Best regards
  
  Abbas
- August 8, 2019 at 4:49 am
  
  Amine Ben Hadj Ali
  Ansys Employee
  
  Best to be near one as in the workshop