Investigating the effect of the speed and temperature of the inlet flow to the afterburner on the characteristics of the flame and flow

Increasing thrust in modern air turbo engines is one of the main concerns for engine designers. Afterburners are one of the most important components that can boost thrust without a significant increase in weight. They are used for short periods during maneuvers, takeoff, or sudden speed increases. Afterburner performance can be categorized into two modes: afterburner on and afterburner off. One of the key requirements for designing an afterburner is flame stability. The length of the recirculation zone right behind the afterburner can be considered an indicator of flame stability. In this research, the effect of temperature and inlet flow velocity on afterburner performance under combustion conditions has been investigated. Inlet temperatures range from ۲۹۹ to ۷۵۰ Kelvin, and inlet velocities vary from ۱۷.۱ to ۶۸ meters per second. The results show that increasing the inlet temperature to the afterburner not only increases the length of the recirculation zone but also increases the flame spread angle, ultimately leading to improved combustion efficiency. However, increasing the inlet velocity reduces the flame spread angle, and at lower velocity ranges, it has a minimal impact on the recirculation zone.

کلیدواژه ها:

Afterburner ، Bluff body ، Numerical Simulation ، Recirculation Zone