Master Thesis - External Heat transfer

We are now looking for a student to take on the assignment: Calculation of external heat transfer boundary conditions for hot gas turbine components.

The Assignment:

To determine the thermal state of a turbine component in a gas turbine, typically a vane or a blade, calculation of the external or gas side boundary condition is needed. This includes prediction of local heat transfer coefficient (hereby noted as HTC) and gas temperature distributions, since for example hot streaks can have a highly local effect on a component. Furthermore, in the high-speed compressible flow of a gas turbine the recovery effect in the boundary layer must be considered in the calculations.

Several factors influence the boundary layer on the external surfaces in the turbine hot gas path and hence the external HTCs. Examples of such factors are turbulence intensity, turbulence length scale, surface roughness, transition from laminar to turbulent flow, curvature, pressure distribution and Mach number distribution as well as cooling features. This makes it a highly challenging task to calculate the accurate HTC distribution and thereby the metal temperature of the component, where also hot streaks are of importance.

LET’S TALK ABOUT YOU

Your profile
* Student at MSc level with focus in mechanical engineering and flow physics.
* Have good knowledge about heat transfer, boundary layer theory and CFD.
* Is structured and can communicate well.
* Can find own ways and solutions to challenges and problems.

Your responsibilities
* Investigate and suggest optimal ways of working when it comes to the gas temperature and heat transfer coefficient distributions on the external surfaces in the turbine hot gas path.
* Numerical simulations using commercial CFD software
* Study (recent) literature to find optimal ways of working with turbine airfoil HTC predictions and /or gas temperature (such as modeling the hot streaks from a stationary vane to a rotating blade).
* Validate methodology for boundary condition prediction based on freely available benchmark HTC data from university test rigs, but also from inhouse engine experience and tests.

Your opportunities for personal growth
* Gain experience in how heat transfer is dealt within the industry.
* Gain knowledge about the complex physics of turbine hot gaspath heat transfer.
* Gain insight into the cooling and aero departments of Siemens Energy.
* Gain better understanding of the limitations and opportunities of CFD.

LET’S TALK ABOUT US

"Let’s make tomorrow different today" is our genuine commitment at Siemens Energy to all customers and employees on the way to a sustainable future.

Siemens Energy is one of the world’s leading energy technology companies. The company works with its customers and partners on energy systems for the future, thus supporting the transition to a more sustainable world. With its portfolio of products, solutions and services, Siemens Energy covers almost the entire energy value chain – from power generation and transmission to storage. The portfolio includes conventional and renewable energy technology, such as gas and steam turbines, hybrid power plants operated with hydrogen, and power generators and transformers. More than 50 percent of the portfolio has already been decarbonized.

A majority stake in the listed company Siemens Gamesa Renewable Energy (SGRE) makes Siemens Energy a global market leader for renewable energies. An estimated one-sixth of the electricity generated worldwide is based on technologies from Siemens Energy. Siemens Energy employs 91,000 people worldwide in more than 90 countries and generated revenue of around €29 billion in fiscal year 2019. In Sweden Siemens Energy has 2600 employees in 10 locations.

Read more about Siemens Energy here:

www.siemens-energy.com

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Job & Career: https://www.siemens-energy.com/global/en/company/jobs.html

Application

Don’t hesitate – apply via https://jobs.siemens-energy.com/jobs, id nr 228107 not later than 2021-11-07.

We will request a copy of your completed courses in the application phase.

For questions about the role, please contact the recruiting manager Mats Annerfeldt at
mats.annerfeldt@siemens-energy.com.

For questions about the recruitment process please contact the responsible recruiter Nelly Johansson at nelly.johansson@siemens-energy.com.

Location: Finspång

Trade Union Representatives:
Veronica Andersson, Unionen, 0122-840 21
Simon Von Eckardstein, Sveriges Ingenjörer, 0122-842 24
Jan Lundgren, Ledarna, 0122-812 33
Jonny Persson, IF Metall, 0122-817 69