The Heat Transfer and the Friction in the Nozzles of the Supersonic Turbine in High Temperature, Pressure and Initial Turbulence Gas Flow Conditions Using Second Moment Closure Model for Turbulence

摘要

The heat transfer and the friction in the nozzle of the supersonic turbine in high temperature T< 2000 K, the pressure P<50 MPa are discussed. The influence of the initial value of the turbulence Tu < 20% is taken into account. The momentum and heat transfer in turbine nozzle are predicated using the second moment closure model for turbulence. The model for the turbulence includes three transport equations for: turbulent shear stress -; turbulent kinetic energy- and turbulent heat-. The initial turbulence is simulated on axis of the turbine nozzle by the exponential functions which are depended from initial parameters of the flow on inlet section of the turbine nozzle. The second moment closure model is verified using well-known experimental data for heat transfer and friction for cooled and adiabatic wall and laminar-turbulent transition data. The combined and separated influence of the each values temperature, pressure and initial turbulence on the heat transfer and friction and as result on the nozzle wall temperature are calculated. The predictions are made for the different material of the nozzle wall.The results obtained using verified model for turbulence permit to make conclusions about possibilities of the application of different materials for the wall of the turbine nozzles and also about processes of the heat transfer and the friction in the laminar-transition- turbulent region of the gas flow in nozzles of the turbine.