CFD study of wake decay and separation regions in jet engine test facilities

Gilmore, Jordon and Jermy, Mark (2007). CFD study of wake decay and separation regions in jet engine test facilities. In: Peter Jacobs, Tim McIntyre, Matthew Cleary, David Buttsworth, David Mee, Rose Clements, Richard Morgan and Charles Lemckert, 16th Australasian Fluid Mechanics Conference (AFMC). 16th Australasian Fluid Mechanics Conference (AFMC), Gold Coast, QLD, Australia, (436-442). 3-7 December 2007.

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Author Gilmore, Jordon
Jermy, Mark
Title of paper CFD study of wake decay and separation regions in jet engine test facilities
Conference name 16th Australasian Fluid Mechanics Conference (AFMC)
Conference location Gold Coast, QLD, Australia
Conference dates 3-7 December 2007
Proceedings title 16th Australasian Fluid Mechanics Conference (AFMC)
Place of Publication Brisbane, QLD, Australia
Publisher School of Engineering, The University of Queensland
Publication Year 2007
Year available 2007
Sub-type Fully published paper
ISBN 9781864998948
Editor Peter Jacobs
Tim McIntyre
Matthew Cleary
David Buttsworth
David Mee
Rose Clements
Richard Morgan
Charles Lemckert
Start page 436
End page 442
Total pages 7
Collection year 2007
Language eng
Abstract/Summary After overhaul or repair, turbofan engines are tested to ensure reliability and thrust meet safe standards. For civil turbofans, these tests are conducted off the wing in indoor test cell facilities. The goal of test cell design is to develop a facility that generates repeatable airflow conditions. Current design and development techniques of jet engine test facilities utilise scaled physical models and 1-D numerical models. With recent development in inexpensive high speed computing recourses, computational fluid dynamics (CFD) has become a attractive method of designing and problem solving within such facilities. One of the principal issues in modelling test cell flow is the choice of turbulence model. The standard forms of the computationally efficient two-equation models are known to over-predict the length of wakes from bluff bodies in the flow e.g. the beams which support flow conditioning screens. For this application, the Reynolds Stress (RS) linear pressure strain model and LES based models are prohibitive in terms of computational expense. This work seeks a turbulence model suitable for simulations of test cell flow by tuning the constants of a two-equation RANS model. This is done to gain closer agreement to the downstream wake velocity field produced by a square cylinder disturbance to a uniformly flowing fluid. The k-w turbulence model with default parameters is selected as the most appropriate starting point for development. A parametric study suggests that a model with * and i both set at five times the default value as the best choice for test cell flow studies. This model adequately reproduced the velocity recovery after 4.5 cylinder diameters downstream. It did not reproduce the velocity structure in the recirculation zone immediately downstream of the cylinder. The details of the flow in this recirculation zone have minimal impact on the gross flow in the cell and are of secondary importance in this analysis.
Subjects 290501 Mechanical Engineering
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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Created: Wed, 19 Dec 2007, 10:41:01 EST by Laura McTaggart on behalf of School of Engineering