High Order CFD of secondary air system in turbines.
The growing demand for air travel and concerns about its environmental impact demand urgent action. The scientific community has acted by fixing milestone to be achieved within the decade 2015-2025: a reduction of 75% in NOx emission and the improvement of 70% in efficiency in terms of Specific Fuel Consumption (SFC). In order to increase even further efficiency and specific power output of gas turbines, the Turbine Entry Temperature (TET) has been augmented and the metal alloy used to build the turbine stage is affected by higher and higher thermal stresses. In particular turbine rotor disks are one of the most highly stressed components in the modern aero-engine. The hot flow in the turbine annulus is characterised by strong unsteadiness, and there is the risk of damaging the disks blade due the leakage of hot streams inside cavities through the seals. An effective way to control the temperature in blade disks is to purge cold flow inside the cavities. This constitutes what is generally known as secondary air system. Both academic and the industrial world are currently addressing strong interest to the investigation of fundamental mechanisms involved in such systems.
The proposed project will be developed within the Turbomachinery Research Centre (TRC) at university of Bath, which is a leading group in the investigation of secondary air systems. The centre is worldwide known for the development of theoretical models and experimental facilities for the investigation of the flow in rotating cavities in turbines. The use Computational Fluid Dynamic (CFD) simulations is an indispensable tool to develop new technologies for civil aero-engines and aerospace applications. CFD provides a complementary point of view of the flow structures not available from the experiments. At the same time the large amount of experimental data available within the centre represents an opportunity to validate CFD solver.
The project consists in the development and improvement of the state of the art CFD techniques (LES-DES) starting on the basis of a well-established and validated unstructured CFD in-house solver available at University of Bath. CFD approaches such as U-RANS simulations have been the workhorse tool to design a wide range of components in turbomachinery, but demonstrated clear limitations in catching the structures governing the flow inside the cavities. The successful candidate will be responsible of a campaign of simulations aiming to identify the role of the large scale flow structures in cavities and will provide the key for a better understanding of the results collected in the experiments carried on at TRC.
Finally, the student will work in a friendly and multi-disciplinary environment using a combination of techniques and numerical tools which will further enhance the student’s development. The work will be carried on in close collaboration with industrial partner such as Siemens and Safran. The student will also interact with other PhD students responsible for the experimental campaigns. The successful candidate will have the opportunity to disseminate the results of the research in international journals and to give presentations to international conferences.
Successful applicants will ideally have graduated (or be due to graduate) with an undergraduate Masters first class degree and/or MSc distinction (or overseas equivalent). Any English language requirements must be met at the deadline for applications
For informal inquiries contact Dr Mauro Carnevale : [Email Address Removed]
Formal applications should be made via the University of Bath’s online application form for a PhD in Mechanical Engineering. Please ensure that you state the full project title and lead supervisor name on the application form.
More information about applying for a PhD at Bath may be found here:
Anticipated start date: 30 September 2019
This project is eligible for inclusion in funding rounds scheduled for end of November 2018, January 2019, February 2019, March 2019 and April 2019. A full application must have been submitted before inclusion in a funding round.
Funding will cover Home/EU tuition fees, a maintenance stipend (£14,777 pa (2018/19 rate)) and a training support fee of £1,000 per annum for 3.5 years. Early application is strongly recommended.
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FTE Category A staff submitted: 61.00
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