two stage steam turbine
hi
I calculate two stage of steam turbine (high pressure stage), i have problem with mass flow  it is much lower than for 0D calculations (20%). I used both coupled and segregate solver. can you help me? 
Re: two stage steam turbine
did u make grid indpendence study?

Re: two stage steam turbine
yes I made, and for all cases mass flow is similar I also checked different turbulence models and the problem still exist for different cases

Re: two stage steam turbine
can u send ur goemtry and boundary conditions file

Re: two stage steam turbine
no i cannot

Re: two stage steam turbine
Does your 0dimensional model take into account effects like area shrinkage due to boundary layers, pressure losses at tip gaps, boundary layer separation, radial flow, etc.? 20% is not that much to me!
Razvan 
Re: two stage steam turbine
this 0dimensional model seems to be ok, it takes into account all the mentioned efects, maybe the problem are the magnitude of pressure losses (for 0D model). the factor for calculation of them is not proper. i calculate partial admission stage (i have four valves) with the second stage. maybe the problem is with the area between these two stages (it is quite big) i am not sure. if i calculate the case where 2 valves are opened the mass flow is ok, for case with 4 opened valves the mass flow differences are big. when i calculate only admission stage the mass flow rate from my calculation is equal to the one from 0D. so i am not sure what to do yet.

All times are GMT 4. The time now is 07:01. 