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Calculation sequence for the simplified turbine model

As before, we may regard the boundary pressures, Pe.i. Pe,2. .., PB.i . PE.N, as governed solely by the outputs of integrators ( local mass and temperature), so that they will be fixed at any time instant. The same will apply to the upstream specific enthalpy, h p, the upstream specific volume, v p, and the turbine speed, N. The steady-state flow balance equations are  [Pg.201]

The variables necessary to determine the flows coming into the turbine and leaving the turbine are the upstream pressure, the upstream specific volume, the downstream pressure and the valve position. See Chapters 6 and 10 for details of calculational methods. The internal mass flows, W i= 1./V are calculated as the flows through each nozzle, and this procedure will need to be carried out iteratively at each timestep. Calculation of the overall performance of the turbine at each timestep may follow the following sequence. [Pg.201]

Provide a first estimate of the stage inlet pressures, [Pg.201]

N (initially from a best estimate of the steady-state conditions, and then from the value at the last timestep). [Pg.201]

Calculate the mid-stage pressures, pi.,. In the case of an impulse stage these will be the same as the inlet pressure to the next stage. Use equation (16.34) for a reaction stage. [Pg.202]


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