# two stage steam turbine

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 June 1, 2006, 07:25 two stage steam turbine #1 sebastian Guest   Posts: n/a 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?

 June 1, 2006, 08:18 Re: two stage steam turbine #2 sam Guest   Posts: n/a did u make grid indpendence study?

 June 1, 2006, 08:26 Re: two stage steam turbine #3 sebastian Guest   Posts: n/a 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

 June 2, 2006, 15:34 Re: two stage steam turbine #4 sam Guest   Posts: n/a can u send ur goemtry and boundary conditions file

 June 5, 2006, 01:46 Re: two stage steam turbine #5 sebastian Guest   Posts: n/a no i cannot

 June 6, 2006, 15:27 Re: two stage steam turbine #6 Razvan Guest   Posts: n/a Does your 0-dimensional 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

 June 7, 2006, 02:15 Re: two stage steam turbine #7 sebastian Guest   Posts: n/a this 0-dimensional model seems to be ok, it takes into account all the mentioned efects, maybe the problem are the magnitude of pressure losses (for 0-D 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 0-D. so i am not sure what to do yet.

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