Design and Flow Field Study of a Novel Combustion Chamber with Full Annular Scale Swirl

This study proposes a novel multi-swirl coupled inlet combustor to minimize systematic total pressure loss and enhance compactness. The design features a Head Swirler, an Intensified Swirler, and a Truncated Swirler to organize the flow field. The objectives were to investigate the flow field characteristics under their interaction and establish a definitive momentum ratio design criterion. Through numerical simulations, the key findings are: (۱) The triple-swirl flow field exhibits four distinct modes, with stable recirculation zones forming within a momentum ratio range of ۱:۱:۱ to ۱:۳:۴. (۲) A critical design criterion was derived: a stable and well-developed recirculation zone is achieved when the momentum of the Truncated Swirl is close to the sum of the momenta of the head and Intensified Swirls, and the momentum of the Intensified Swirl is not less than that of the Head Swirl. (۳) Under this criterion, the area of negative radial velocity, indicative of a strong inward flow anchoring the vortex, increased by over ۵۰% compared to the unstable "Head-Intensified Synergistic Recirculation " mode. (۴) This flow structure remained robust across different flow distribution schemes , swirler geometry and total mass flow rates (۱۰۰ g/s and ۲۰۰ g/s), demonstrating the criterion's practical utility for designing combustors with full-annular swirl intake.

کلیدواژه ها:

Multi-swirl ، Momentum ratio ، Short helical combustor ، Flow field characteristics ، Numerical simulation