Three-dimensional, unsteady, inviscid flow in an axial turbine stage

Abstract EN

This paper presents an advanced approach to compute the three-dimensional, rotational, adiabatic, inviscid flow of a perfect gas in a highly twisted transonic axial turbine stage.

The time-dependent Euler equations, expressed in a Cartesian coordinate system, are solved using a time marching method and a finite volume approach.

The absolute flow is computed in the nozzle vanes passage, whereas the relative flow is computed in the rotor blades passage.

The phase relation of nozzle and rotor flows and the related blade row interaction are accounted for in the time-space domain.

The results show that the present method of calculation makes a practical contribution to predict actual turbine flows through a turbine stage that have an arbitrary number of vanes and blades for each nozzle and rotor.

It is clear that this flow has a three dimensional aspects, in spite of the high hub / tip ratio which has theoretically a two-dimensional flow aspects.