Evaluation of simultaneous effects of inlet stagnation pressure and heat transfer on condensing water-vapor flow in a supersonic Laval nozzle

In supersonic two-phase flows of steam, under the influence of rapid expansion, the vaporbecomes supersaturated. following this condition, nucleation happens during the vapor phase; formedtiny droplets grow along the passage and, therefore, the condensation phenomenon occurs. the effects ofthe condensation phenomenon in power steam turbines include efficiency drop and mechanical damage.in the previous work of the authors, volumetric heating was introduced as an approach towards reducingthe mentioned damage and loss. however, further investigations revealed that heating decreases the massflow rate, which can be increased by adjusting the inlet stagnation pressure. in this paper, using a semianalyticaland a one-dimensional modeling approach, the simultaneous effects of volumetric heat transferand inlet stagnation pressure variation are investigated in order to remedy the mass flow rate reduction.the results show that increasing the inlet stagnation pressure up to 5% can fix the mass flow rate of thenon-adiabatic flow, compared to the adiabatic flow under the same conditions.