Using moderm CAD-embedded CFD code for numerical simulation of heat transfer in vanes and blades

게시자: Songyi Han, 2017. 7. 20. 오후 7:03

The heat transfer performance of internal cooling passages inside gas turbine vanes and blades is one of
importance to the design engineers because higher cooling effectiveness generally allows increased turbine
temperatures, which increases its efficiency.

For design optimization of high temperature turbines, CFD tools are widely used. But it should be noted that each
calculation is connected with huge computation problems. And in order to overcome them experts with high
qualifications are required. In the meantime design of the construction is the responsibility of design engineers
who do not generally have the expertise in computation fluid dynamics. So, there is growing needs for design
engineers to have a CFD tool. This CFD tool should work together with the CAD system, be reliable, robust, give the
same quality of the results as other CFD tools and does not require a high qualification in CFD.

This paper presents the results of CAD-Embedded, CFD software FloEFD for evaluation of the thermal and
temperature conditions of vanes and blades. The FloEFD approach is based on two main principles: direct use of
native CAD as the source of geometry information; and synergy of full 3D CFD modeling, combined with simpler
engineering methods in cases where the mesh resolution is insufficient for a full 3D simulation.

To validate the CFD code in the field of heat transfer in gas turbine vanes and blades three independent
experiments are selected. For each case consideration is given to particular parameters of conjugate heat transfer
which is computed and compared with published tests.

Firstly, temperature and heat transfer coefficient in the real test conditions for a vane with profile C3X are
calculated. In the second case, convective heat transfer on the steam turbine vane is considered. The temperature
distribution in the vane is evaluated. The specificity of the case, is that the experimental test rig represents a
rectangular duct containing a three-vane cascade. In the third, FloEFD simulation, of film-cooled first-stage turbine
vanes are presented. Relatively simple geometry of the model allows you to demonstrate the contribution of the
film effect to the cooling process.

Finally, a numerical calculation for real industrial high-pressure turbine blades is performed. Complicated internal
cooling systems, includes channels filled with intensifiers. By taking the inlet gas parameters setting, circumferential
distortion is taken into account. The cooling air flowing out of the axial clearance is also considered in the

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