Injection performance of micro-injector hot-air anti-icing system

To optimize the micro-injector hot-air anti-icing system, this study designed a model of the micro-injector chamber with five configurations, varying key structural parameters. Numerical simulations using ANSYS Fluent assessed the influence of these parameters on system performance. The variables adjusted included: (1) the gap between the jet hole and the mixing chamber, set between 2mm to 4mm; (2) the height of the corrugated plate channel's outlet, ranging from 4mm to 6mm, with inlet heights between 6mm and 8mm; (3) the mixing chamber length, modified from 42mm to 48mm. Results indicate that increasing mixing chamber length and the jet hole-mixing chamber distance improved injector performance and heat flux density due to better fluid mixing. Smaller inlet height increased injection ratio, however, concurrent reduction in both inlet and outlet heights decreases the injection ratio. Experimental validation was performed using a novel wing anti-icing heat load simulation device on a model configured with an inlet height of 6mm, outlet height of 4mm, a 4mm gap from the jet hole to the mixing chamber, and a 42mm mixing chamber. The experimental outcomes closely aligned with the simulation data, validating the efficacy and accuracy of the simulations in designing micro-injector hot air anti-icing systems.