Title: Effects of fuel pool condition on distribution of fire diffusion velocity in aero-engine variable section annular cavity

Authors: Guanbing Cheng; Zhangyuan Chen; Haobo Luo

Addresses: Key Laboratory of Civil Aviation Thermal Hazards Prevention and Emergency Response, Civil Aviation University of China, Tianjin, 300300, China; College of Aeronautical Engineering, Civil Aviation University of China, Tianjin, 300300, China ' College of Aeronautical Engineering, Civil Aviation University of China, Tianjin, 300300, China ' College of Aeronautical Engineering, Civil Aviation University of China, Tianjin, 300300, China

Abstract: Fire scenarios in annular cavities threaten operation safety of turbofan engine and its structural integrity. Physical and numerical models of one variable section annular cavity of one turbofan were established. Effects of pool conditions were examined on variations of the single pool fire plume velocity. The results show that pool fire undergoes original increase stage and quasi-steady one in various pool locations, sizes and shapes. The fire plume floats upwards, propagates and touches the core engine cavity. The fire plume velocity above the pool is higher than those at other locations in the cavity. The plume velocity is low at left and right sides of inner ring. The smaller size and width pool and the longer distance between the pool and the inner ring may prolong fire plume floating distances and time. The pool fire shape and its plume velocity distribution oscillate from symmetrical state to unsymmetrical one.

Keywords: turbofan; variable section annular cavity; single fuel pool; pool location; size and shape; plume velocity; FDS; fire dynamic simulator.

DOI: 10.1504/IJCSM.2025.148205

International Journal of Computing Science and Mathematics, 2025 Vol.21 No.4, pp.332 - 354

Received: 31 Jan 2025
Accepted: 29 May 2025
Published online: 29 Aug 2025 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article