Study on thermal-flow field characteristics in multi-angle deicing jet using phase-field and k-ω turbulence models

A multi-angle jet model for aircraft deicing under engine-idle conditions was established based on the k-? turbulence model and introduces the phase-field method to more accurately capture gas-liquid interface behavior. The model's simulation effectiveness was verified through experiments, and the influence of different jet inclination angles (30?, 45?, 60?) on the wall flow field structure, pressure distribution, and heat transfer performance was systematically analyzed based on the simulation results. The research findings indicate that under the condition of a nozzle Reynolds number of 3.2?10?, the jet with a 30? inclination angle achieves the optimal comprehensive heat transfer effect on the wall. Its spanwise diffusion range increases by approximately 36 nozzle diameters compared to the 60? case, and the position of the upstream high-temperature core region shifts from x/d = -2.5 to x/d = -13.5. Furthermore, the 30? jet also demonstrates better performance in terms of impact pressure and turbulence intensity. This study provides a theoretical basis for optimizing spray parameters in the engine-idle deicing process and has practical significance for improving deicing efficiency and reducing deicing fluid consumption.