Back-propagation oblique shock waves in turbine cascades induced by detonation DOI

Yunying Qi,

Hua Qiu, Cha Xiong

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(5)

Published: May 1, 2025

The interaction mechanism and suppression methods between the backpropagation oblique shock waves (BOW) from detonation combustion in afterburner flow disturbances with front-end components, remains a major challenge engine coupling. An experimental investigation was systematically conducted based on micro-axial turbine. evolution characteristics of wave system structures pressure variations turbine field under influence BOW were thoroughly examined. Special emphasis placed modulation effect cascades waves, effectiveness compared different equivalence ratios. results indicate that complex induced within cascade channel by BOW, significantly enhancing unsteady field; propagation velocity found to increase ratio, reaching maximum value 1818.18 m/s at an ratio 1.4; rotor blades exhibited superior stator, drop percentage 52.85% for cascade, while only 19.01% achieved stator cascade. This study provides essential evidence theoretical guidance engines.

Language: Английский

Risk Analysis of Fuel Leakage and Explosion in LNG-Powered Ship Cabin Based on Computational Fluid Dynamics DOI Creative Commons
Yuechao Zhao, Yubo Li, Weijie Li

et al.

Fire, Journal Year: 2025, Volume and Issue: 8(5), P. 192 - 192

Published: May 10, 2025

In order to analyze the explosion risk of engine room, this paper uses CFD software simulate LNG leakage process in room ship, and combustible gas cloud obtained from simulation explosion, analyzing its combustion dynamics. On basis previous studies, studies coupling ensure that it conforms real situation. At same time, taking overpressure, temperature, mass fraction products as breakthrough point, harm human body influence ignition source location on propagation characteristics shock wave discusses obstacles diffusion accumulation. The results show reaches maximum concentration injection direction, cabin have a significant effect accumulation gas. based results, can be determined shape pressure field generated by is irregular, at obstacle side has obvious Finally, reduce hazard, collaborative strategy modular layout, directional ventilation, detection proposed, which provides ideas for explosion-proof design cabin.

Language: Английский

Citations

0
Back-propagation oblique shock waves in turbine cascades induced by detonation DOI

Yunying Qi,

Hua Qiu, Cha Xiong

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(5)

Published: May 1, 2025

The interaction mechanism and suppression methods between the backpropagation oblique shock waves (BOW) from detonation combustion in afterburner flow disturbances with front-end components, remains a major challenge engine coupling. An experimental investigation was systematically conducted based on micro-axial turbine. evolution characteristics of wave system structures pressure variations turbine field under influence BOW were thoroughly examined. Special emphasis placed modulation effect cascades waves, effectiveness compared different equivalence ratios. results indicate that complex induced within cascade channel by BOW, significantly enhancing unsteady field; propagation velocity found to increase ratio, reaching maximum value 1818.18 m/s at an ratio 1.4; rotor blades exhibited superior stator, drop percentage 52.85% for cascade, while only 19.01% achieved stator cascade. This study provides essential evidence theoretical guidance engines.

Language: Английский

Citations

0