boundary conditions
 

hi ,
i am doing analysis for steam turbine...so my inputs are
inlet pressure-125ata(12258310 pascals)
inlet temp -783K
inlet flow is 140 tonn/hr

now can any one tell me tht which type of boundary condition i have to choose...
coz i have pressure,temp and flow rate....so if i choose mass_inlet as my boundary type then where i have to give the inlet pressure...shall i give my inlet pressure in operating conditions...can any one suggest me reg this....

hi,
can anyone take some effort to reply my query....thanks in advance....

Hi Sudhir,
your problem is closed in incompressible region but in steam turbines compressibility effect is considerable! So you need to know the pressure where outflow exposed to.
e.g. consider a converge-diverge nozzle where mass flow rate and inlet pressure are known, by changing outlet pressure you will get different flow fields. therefore I think in compressible region your problem is not closed.

Thanks amir...will try and let u know the result..