Local heat transfer under the boundary conditions of turbomachinery

Modeling the working processes in turbomachines of various purposes is of particular interest nowadays. It is very important to take into account the peculiarities of heat transfer when developing new methods of calculation and simulation of working parameters of new types of turbomachines. Accounting for the heat transfer from the working medium to the structural elements is dictated by the increased heat density of turbomachines, the growing working time of the system as a whole, and the enhanced requirements for reliability and uptime. A technique for computing and simulating the working fluid flow in the cavities of turbomachines taking into account the heat transfer to structural elements is developed. The integral form of the energy equation describing a thermal boundary layer and the heat transfer law describing a turbulent boundary layer are used to deduce relationships for determining the local heat transfer coefficients of rectilinear and rotational flows.

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