Designing of the composite nozzle blade by the 3D prototyping

The paper describes the manufacture of the composite nozzle blade model by the 3D-prototyping method. To produce the real blades the technology and methods need to be developed using their models. As a model the whole reinforced composite blade including the thermal protection was presented. In the first stage the models were produced from the polymeric materials. The production of these models has allowed carrying out the adjustment of the mathematical program for the manufacturing process of the real blades and their work in the gas-turbine engine. It was found that the proposed design of the cooled blades allows the operating at the temperature of the oncoming flow of 2300K. To be able to work at high temperatures of the combustion products a variety of methods for the cooling of the nozzle blades are in use. Widely used is the protective air cooling by blowing of cold air on the outer surface of the profile of the blade through the permeable (porous) material. In case of “porous cooling” the streams of the cooler at the outlet of the pores merge and form a boundary layer, thereby significantly reducing convective heat transfer between the gas and the surface of blade.