Abstract:  To investigate the temperature field characteristics of the flame jet after impacting adjacent buildings in a confined space, experimental studies were conducted to explore the temperature distribution features of the flame jet under bi-lateral and tri-lateral restricted boundaries. The results indicate that the wall temperature of the obstacle is significantly affected by the form of the obstacle, the distance between the hole and the plate, and the leakage rate. When the distance between the two obstacles is small, the lateral diffusion of the jet flame is obstructed. When the distance between the hole and the plate is small, the high-temperature zone under the double-sided obstacle is located at the center of the wall and has a smaller thickness. As the leakage rate increases, the flame height under three-sided confinement is significantly higher than that under double-sided confinement, and the temperature inside the confined area is higher. Increasing the spacing between the plates leads to an upward displacement of the high-temperature region. Moreover, there exists a positive correlation between temperature and leakage rate. As the spacing increases, the area of temperature rise expands, although the magnitude of temperature rise diminishes. Furthermore, the introduction of multiple lateral obstacles has an impact on the migration of the high-temperature region.

Key words:  jet flame, obstacle, temperature, orifice plate spacing