Project Title: Constant volume combustion and its reduced order model
Hosting Institution: ENSMA
Supervisor: Prof. Marc Bellenoue and Dr. Bastien Boust
Duration: 36 months
Objectives: The project aims at experimentally investigating the Constant Volume Combustion (CVC) cycle dynamics and stability associated with high dilution by Residual Burned Gas (RBG) or large scavenging associated with fuel-lean equivalence ratios. Such conditions can be used to reach acceptable operation for the gas turbine components (mechanical stresses, material temperature, etc.) and for the environment (CO2 or NOX emissions). Several strategies of ignition (spark, hot spot, self-ignition), and combustion (scavenging, dilution by hot RBG, synthetic dilution by neutral gas) will be characterized in terms of cycle performance and emissions to reach this target. The CV2 test bench (see figure 1) developed in the framework of the CAPA program (Alternative Combustion modes for Airbreathing Propulsion) will be used to perform this study. Time-resolved diagnostics will be performed to gain insight into the reactive flow properties (velocity, turbulence intensity, stratification) and their effects on the overall combustion behaviour. This research will be performed in close association with ESRs 3, and 4 of the INSPIRE program and will take advantage from periods at CERFACS (where the CV2 setup will be simulated).
Expected Results: Better understanding of: i) key phenomena controlling the CVC stability and performance, ii) ignition processes, iii) impact of scavenging and RBG dilution, and iv) reactive flow behaviour within the combustor.
Planned secondment(s): 3 months in CERFACS (Toulouse, France) for detailed analysis of CVC technology, and additional 3 months at UNIFI (Florence, Italy) to deepen about cooling schemes.
Additional information for application: Requirements: Master or Engineering degree in Fluid mechanics, Energetics, Combustion
Deadline: October 1st 2021