Investigation of intrinsic flame instabilities via the Linearized Reactive Flow

Institut

Professur für Thermofluiddynamik

Typ

Semesterarbeit / Masterarbeit /

Inhalt

theoretisch /  

Beschreibung

Combustion instabilities occur in gas turbines or domestic boilers and impair the development of low-emission combustion technologies based on lean premixed combustion, and H 2 -enriched fuels. This thesis will focus on combustion instabilities caused by the imbalance of heat-conduction and species diffusion close to the flame; the so-called intrinsic flame instabilities. These instabilities wrinkle the flame, which increases consumption speed. Understanding intrinsic flame instabilities is necessary to developing predictive models which are key to the design of new combustion systems.

This thesis will investigate intrinsic flame instabilities via a global linear stability analysis based on the Linearized Reactive Flow (LRF) equations. LRF equations provide a monolithic description of all interactions within the flame and already proved to be useful for stability computation. The student will first derive the equations for the linear stability of a planar flame. He/she will then implement those equations in a Finite-Element code de-
veloped at the Professorship for Thermofluid Dynamics. The stability results will be compared against experimental data and will pave the way to investigating the destabilizing mechanisms triggered by intrinsic flame instabilities. Depending on the advancement, the student will explore the influence of pressure and more realistic cases.

This thesis is the opportunity to expand your knowledge in both numerical methods (global linear analysis) and combustion physics. You will develop code in an object-oriented Python tool and manipulate state-of-the-art libraries for solving large linear systems.

Voraussetzungen

Fluid dynamics
Python
Stability analysis

Möglicher Beginn

sofort

Kontakt

Varillon, Gregoire, Ph.D.
Raum: MW0725
Tel.: (089) 289 16237
gregoire.varillontum.de

Ausschreibung