A full conjugate heat transfer Computational Fluid Dynamics (CFD) study of a Biaxial rig enclosure used for the lifing of the high pressure turbine disc firtrees of a large turbofan engine has been undertaken. Initial rig tests had demonstrated challenges associated with test repeatability and unexpected thermal gradients in some components. The detailed CFD analysis was used to gain an appropriate understanding of the overall heat balance for the assembly, requiring all three modes of heat transfer as well as the fluid dynamics about the disc-blade components. Moreover the detailed modelling methodology presented for the twin short wave infrared emitters allowed the balance of radiation to convection heat transfer from the heaters, essential to the whole study, to be appropriately captured.
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