University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Geometrical uncertainty and film cooling: Fillet radii

Montomoli, F, Massini, M, Salvadori, S and Martelli, F (2010) Geometrical uncertainty and film cooling: Fillet radii In: ASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010, 2010-06-14 - 2010-06-18, Glasgow, UK.

Full text not available from this repository.

Abstract

This study presents an investigation of the impact of filleted edges variations on heat transfer. In real gas turbines, sharp edges are an approximation, because of manufacturing tolerances and/or geometrical modifications occurring during operation. The value of fillet radius is not exactly known a priori. It can be assumed that a specific radius occurs with a probability following a probabilistic distribution. For this reason, the effect of variation of the filleted edge on internal channel of a film cooling configuration has been studied numerically using an in house solver. The hole exit is fan-shaped and the feeding duct axis and the main stream are perpendicular to each other. A response surface has been generated varying the internal Mach number of coolant and the pressure ratio range between coolant and main gas. Four fillets radii for the internal duct have been analysed, r/D=0.0-5%. A Gaussian distribution for the fillet radius has been assumed. Using the over mentioned distributions it is possible to obtain the probabilistic functions of the corresponding discharge coefficient, C d, and adiabatic effectiveness, h. The overall variation of C d and h can be more than 10% the value without fillet. Furthermore the differences on Cd due to the uncertainties on fillet radius are bigger than those obtained modifying the exit duct shape (i.e. from cylindrical to fanshaped). This paper shows that the effect of variation of fillet radii must be included in numerical simulations. This has direct consequences on LES and DNS simulations, which normally include sharp corners or mean radii. A probabilistic approach must be included in the analysis of the results and the equivalent fillet radius assumed instead.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Authors :
NameEmailORCID
Montomoli, Ff.montomoli@surrey.ac.ukUNSPECIFIED
Massini, MUNSPECIFIEDUNSPECIFIED
Salvadori, SUNSPECIFIEDUNSPECIFIED
Martelli, FUNSPECIFIEDUNSPECIFIED
Date : 2010
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:22
Last Modified : 17 May 2017 15:03
URI: http://epubs.surrey.ac.uk/id/eprint/835054

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800