Study on ground matching experiments for small-scale weak intensity turbulent combustion

The study of small-scale, weak-intensity turbulent combustion is one of the experimental projects conducted in the combustion science rack during the construction of China's space station. Ground matching experiments were carried out to verify the compatibility of the combustion interface in space station turbulent combustion experiments and to determine the experimental conditions. The constraints of the space combustion science rack were outlined and a burner was designed specifically for studying the small-scale, weak-intensity turbulent combustion in the space station combustion science rack. A ground experimental system was established, and PIV was used to measure the turbulence of the combustion flow field. The experimental results indicate that as the mesh grid increases, the maximum turbulence intensity at the outlet decreases. The inflow velocity of the premixed gas has only a weak influence on the relative turbulence intensity in the flame, indicating that this type of turbulence in the flame is caused by small-scale vortices. Different equivalence ratio experimental results show that the turbulence intensity inside the flame is significantly higher than that in the inflow premixed gas and the combustion product region. Matching experiments were conducted using the designed burner in the combustion experiment cabinet, demonstrating the successful compatibility and ignition of the designed burner.