The Effect of Crosswinds on Icing at Turbofan Engine Inlet 2019-01-2024
Ice accretion on intake components could not only destroy the surface structure and affect intake quality, but the shed ice from the lip surface may cause more serious mechanical damage. In order to analyze the influence of crosswinds on supercooled droplets impingement and icing accretion at the inlet surface of turbofan engine, a complete ice analysis method, which is based on the Messinger model and takes the effect of runback water into consideration, is constructed. The runback water is considered as the laminar flow and the direction is dominated by the bottom flow of air. Air intake quality, local water collection coefficient and icing parameters were investigated at crosswind speed of 15, 20, 25, 30kt. The three-dimension flow field and temperature distribution under crosswind conditions is calculated by the Reynolds average method. Then, the variation characteristics of the supercooled water droplets impingement on the intake surface is calculated based on the Euler method. Finally, the two-dimension icing algorithm is adopted to predict the icing characteristics at engine intake lip. Due to the suction effect generated by the fan plane, the distortion of intake flow has been attenuated under crosswind conditions and intake flow quality meets operating requirements. However, the crosswind has a great influence on the flow of the external profile. The water droplets impinging range of the external surface increases, and the impingement limit moves toward the trailing edge at windward side; the droplets impingement change is opposite to the windward surface near θ=270°. In 0° and 180° sections, the water impingement only changes slightly with the increase in crosswind. The icing area and the icing height and the mass flux of runback water increase with the crosswind at windward side, and it is highly probable that ice accumulates outside the anti-ice region.
Qian Yang, Zhiqiang Guo, Mei Zheng, Wei Dong
Shanghai Jiao Tong Univ
International Conference on Icing of Aircraft, Engines, and Structures