Bench Of The High-pressure Turbine Disk Cavity Rotating Heat Transfer And The Flow And Heat Transfer Calculation Study

In modern industrial gas turbines and aero-engines, a small percentage of the compressed air is bled off for cooling and sealing purposes. Some of the air is used for cooling the turbine blades and nozzle guide vanes, and part of it is employed to cool and seal the turbine discs. It is crucial for cooling high temperature parts in aero-engines to master the rule of the flow field in turbine discs air cooling system.(1) Taking the new BR 700 gas turbine which is developed by Rolls-Royce Deutshland as research object, the numerical simulation has been applied to the new structure of rotating disk system with pre-swirl nozzles on the rotating disk with к ?ε turbulence model and with a new hybrid grid.( 2) The results reveal that the pre-swirl ratio has a great influence on the flow field of the rotating disk, even greater than the rotational Reynolds number, and an initial constant is induced in moment coefficient Cm and average Nusselt number Nuave correlations, which does not exist in the case of without pre-swirl. A new type of pressure coefficient Cp is defined to lead to a linear correlation with radial locations, which will lead to a curve correlation with radial locations with conventional definition of Cp. The correlations of Cm , Nuave and Cp with rotational Reynolds number have been got through the computation with rotational Reynolds number from zero to 1.0 108.(3) Special attentions are given to flow and heat transfer in the rotating disk cavity which are associated with the rotational Reynolds number , and which the mass flow rate coefficient Cw. Finally measurement of the flow field in the rotating disk with a five-hole probe is demonstrated feasible by the numerical simulation.