Task 2.2 Dynamics of hydrogen flames and retro-fitting engines
This task will consider the laboratory test rig by Garcia-Armingol & Ballester 92015). This is a 30 kW premixed swirl-stabilised combustion system with a hydrogen-blend flame, where the concentration of hydrogen can be varied from 0 to 50%; under certain operating conditions, flashback and flashback-induced instabilities were observed. A "digital twin" of this test rig will be developed with the Siemens software platform STAR-CCM+, which provides accurate simulations of designs for many engineering applications, including combustion systems. The test rig will also serve as a benchmark for validating the numerical code. A by-product of these simulations will be the flame transfer function for various hydrogen concentrations, which are needed in tasks 1.3 and 2.1. Subsequently, methodologies will be developed to predict and analyse thermoacoustic instabilities and flashback in hydrogen combustion systems. A numerical study of the susceptibility to flashback in retro-fitted engines will also be performed.