Influence of the experimental setup parameters on the deviation of the similarity criteria in the experimental study of the model boundary conditions from the similarity criteria of the full-scale combustion chamber

This study investigates the combustion processes of methane in an oxygen and carbon dioxide environment within oxygen-fuel energy complexes (OFC). The unique operating conditions, characterized by high pressures (up to 300 atm) and the use of CO2 as a diluent, necessitate a thorough understanding of the combustion dynamics, which differ significantly from traditional gas turbine units (GTU). An experimental setup, inspired by existing literature, is proposed to evaluate the combustion characteristics of methane under these conditions. Key objectives include establishing similarity criteria for hydrodynamic, thermal, and mass transfer processes to ensure the validity of experimental results. The analysis identifies critical parameters such as Reynolds, Euler, Boltzmann, Prandtl, and Damköhler numbers, which serve as benchmarks for achieving operational similarity between model and natural combustion scenarios. The findings indicate that while complete similarity across all criteria is unattainable, satisfactory levels can be achieved for specific processes under controlled conditions. The proposed experimental stand is designed to replicate the conditions of OFC combustion chambers, incorporating advanced measurement systems for accurate monitoring of temperature, pressure, and flow rates. The study emphasizes the importance of conducting separate tests for mass transfer processes to ensure comprehensive evaluations of combustion dynamics. This research provides valuable insights for the design and optimization of burner devices in OFC applications, contributing to the advancement of cleaner and more efficient energy production technologies. The established methodologies and criteria can guide future experimental studies, enhancing the understanding of combustion processes in high-pressure environments.