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Conjugate heat transfer analysis of the tip seal in the counter rotating low pressure turbine

Bochon K., Wróblewski W.

Archives of Mechanics

2015

Vol. 67, nr 3

253--270

The aim of this study was to examine the phenomena associated with leakage flow through the tip seal with honeycomb land and to perform conjugate heat transfer (CHT) analysis of the entire tip area of the blade including the part of casing with rotating cavity above the seal. CFD analyses were performed using commercial software. For the complicated geometrical configuration of the seal region, a calculation model was proposed which enabled a satisfactory approach to flow and heat transfer phenomena. CHT analyses were performed for two cases characterized by different thermal conductivity of the metal. Fluid flow parameters which allowed to recognize flow structures, losses and mixing were taken into account. In CHT analyses, the flow structures for the cavity, the heat transfer conditions as well as the temperature distribution in the whole domain were obtained.

Optimization of Tip Seal with Honeycomb Land in LP Counter Rotating Gas Turbine Engine

Wróblewski W., Dykas S., Bochon K., Rulik S.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2010

Vol. 14, No 3

189-207

The goal of the presented work is an optimization of the geometrical configuration of the tip seal with a honeycomb land, to reduce the leakage flow in the counter-rotating LP turbine of a contra-rotating open rotor aero-engine. This goal was achieved with the use of the Ansys-CFX commercial code and an in-house optimization procedure. The detailed studies including the mesh influence, the stages of the computational domain simplification, and geometry variants are discussed. The optimization process is based on a single objective genetic algorithm (SOGA). The automatic grid generation process and the CFD calculations are based on scripts prepared under the Ansys-ICEM and Ansys-CFX software. The whole procedure is written in the Visual Basic for Applications language (VBA), which allows a direct access to the CAD software with the use of macros and allows a proper connection between the CAD environment and the CFD software. The described algorithm allows parallel computing. In addition to the optimization studies, a sensitivity analysis was also performed. For this purpose, the Elementary Effects Method (EEM) was used. This paper was written within the DREAM European project (Validation of Radical Engine Architecture Systems) of the 7th Framework Program of the European Union.