NDLI: Unsteady Numerical Simulation of the Flow in a Direct Transfer Pre-Swirl System

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ciampoli, Fabio Nicholas, J. Hills John, W. Chew Scanlon, Timothy
Copyright Year	2008
Abstract	Results of fully unsteady numerical simulations of the flow in a direct transfer pre-swirl system are presented and compared with previously published experimental data from an aero-engine representative rig. The conditions considered include those where strong unsteady effects were observed experimentally. Two different rig builds are considered, with the main difference being in the design of the pre-swirl nozzles. The agreement between calculation and experiment is very good in terms of nozzle and receiver hole discharge coefficients and in identifying significant unsteady effects at certain conditions. Predicted cooling air delivery temperatures are lower than those measured. This may be due to heat transfer and other effects in the rig which have not been modelled. Present unsteady results also show agreement, where appropriate, with earlier steady CFD and an elementary model. Both calculations and measurements show similar performance in terms of delivery temperature for the two different builds studied, despite significant difference in pre-swirl nozzle discharge coefficients for the two builds. The calculations indicate that this is associated with the nozzle velocity coefficient being considerably higher than the discharge coefficient in one case.
Sponsorship	International Gas Turbine Institute
Starting Page	1647
Ending Page	1655
Page Count	9
File Format	PDF
ISBN	9780791843147
DOI	10.1115/GT2008-51198
e-ISBN	0791838242
Volume Number	Volume 4: Heat Transfer, Parts A and B
Conference Proceedings	ASME Turbo Expo 2008: Power for Land, Sea, and Air
Language	English
Publisher Date	2008-06-09
Publisher Place	Berlin, Germany
Access Restriction	Subscribed
Subject Keyword	Design Temperature Cooling Computer simulation Discharge coefficient Computational fluid dynamics Nozzles Aircraft engines Flow (dynamics) Heat transfer
Content Type	Text
Resource Type	Article

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