Method Development for Investigation of Real Effects on flow around Vanes (Mechanical Project)

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In the development of turbo machinery components it’s desirable to not spend more time than necessary when setting up aero-thermal calculations to investigate uncertainties in the design.

This report aims to describe general thoughts used in the development of an ICEM-mesh script and the possible configurations in the script file which enables the user to build mesh-grids with/without clearance gap at the hub and/or shroud for different blade geometries. It also aims to illustrate the performance analysis made on the Vinci LH2 turbine, a next generation upper stage engine to the Ariane 5 rocket, in which the effect of the tip gap size on the efficiency has been studied.

The calculations made have shown good agreement with experimental data. The efficiency loss due to the mixing of fluid where leakage flow passes the tip gap, which results in growth of a strong vortex, and the fluid passing the blade tip, with almost no work extracted from it, has shown a quite linear efficiency dependence depending on the tip gap size.
Source: Linköping University
Author: Mårtensson, Jonathan

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