Head (m) as in put parametrer

obliqueshrestha · January 1, 2014, 01:14

How to input head (m) as a input parameter??? I have tried using this constant mass flow rate in different guide vane angles but the result of head head varies from 750 m to 12 m which in my veiw no possible.

My script is

LIBRARY:
CEL:
EXPRESSIONS:
Accumulated Time Step = 100
Angular Velocity = 529 [rev min^-1]
Current Time Step = 100
H net = Hin -Hout
Head = Total Pressure in Stn Frame/gama
Hin = massFlowAve(Head )@Inlet
Hout = massFlowAve(Head )@Outlet
Hydraulic power = gama *Q *H net
Q = massFlow()@Inlet /massFlowAve(Density)@Inlet
Reference Pressure = 1 [atm]
Sequence Step = 100
Time = 0 [s]
atstep = Accumulated Time Step
ctstep = Current Time Step
efficiency = (shaft power /Hydraulic power )*100
gama = 9806 [N*m^-3]
omega = Angular Velocity
shaft power = (torque_x()@Rotating Default )*(omega*2*pi/(360[degree]))
sstep = Sequence Step
t = Time
END
END
END

Please help me with this matter

ghorrocks · January 1, 2014, 05:22

WHy not just define the inlet as a total pressure boundary and the outlet as a pressure boundary? Then you simply define the pressure loss over the system. Read the documentation section on "Choice of boundary conditions" for further details.

January 1, 2014, 01:14	Head (m) as in put parametrer	#1
obliqueshrestha New Member Oblique Shrestha Join Date: Sep 2013 Posts: 1 Rep Power: 0	How to input head (m) as a input parameter??? I have tried using this constant mass flow rate in different guide vane angles but the result of head head varies from 750 m to 12 m which in my veiw no possible. My script is LIBRARY: CEL: EXPRESSIONS: Accumulated Time Step = 100 Angular Velocity = 529 [rev min^-1] Current Time Step = 100 H net = Hin -Hout Head = Total Pressure in Stn Frame/gama Hin = massFlowAve(Head )@Inlet Hout = massFlowAve(Head )@Outlet Hydraulic power = gama Q H net Q = massFlow()@Inlet /massFlowAve(Density)@Inlet Reference Pressure = 1 [atm] Sequence Step = 100 Time = 0 [s] atstep = Accumulated Time Step ctstep = Current Time Step efficiency = (shaft power /Hydraulic power )100 gama = 9806 [Nm^-3] omega = Angular Velocity shaft power = (torque_x()@Rotating Default )(omega2*pi/(360[degree])) sstep = Sequence Step t = Time END END END Please help me with this matter

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January 1, 2014, 05:22		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	WHy not just define the inlet as a total pressure boundary and the outlet as a pressure boundary? Then you simply define the pressure loss over the system. Read the documentation section on "Choice of boundary conditions" for further details.