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CFD study of wake decay and separation regions in jet engine test facilities
| Content Provider | Semantic Scholar |
|---|---|
| Author | Gilmore, Jordan Jermy, Mark |
| Copyright Year | 2007 |
| Abstract | 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. |
| Starting Page | 436 |
| Ending Page | 442 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.jmprecision.co.uk/media/Gilmore_afmc_16_07.pdf |
| Alternate Webpage(s) | https://people.eng.unimelb.edu.au/imarusic/proceedings/16/Gilmore.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
