Ice Particle Transport Analysis with Phase Change for the E~3 Turbofan Engine Using LEWICE3D Version 3.2

摘要

Ice Particle trajectory calculations with phase change were made for the Energy Efficient Engine (E~3) using the LEWICE3D Version 3.2 software. The particle trajectory computations were performed using the new Glenn Ice Particle Phase Change Model which has been incorporated into the LEWICE3D Version 3.2 software. The E~3 was developed by NASA and GE in the early 1980's as a technology demonstrator and is representative of a modern high bypass turbofan engine. The E~3 flow field was calculated using the NASA Glenn ADPAC turbomachinery flow solver. Computations were performed for the low pressure compressor of the E~3 for a Mach 0.8 cruise condition at 11,887 meters assuming a standard warm day for ice particle sizes of 5, 20 and 100 microns and a free stream particle concentration of 0.3 g/m~3. The impingement efficiency results showed that as particle size increased average impingement efficiencies and scoop factors increased for the various components. The particle analysis also showed that the amount of mass entering the inner core decreased with increased particle size because the larger particles were less able to negotiate the turn into the inner core due to particle inertia. The particle phase change analysis results showed that the larger particles warmed less as they were transported through the low pressure compressor. Only the smallest 5 micron particles were warmed enough to produce melting and the amount of melting was relatively small with a maximum average melting fraction of 0.836. The results also showed an appreciable amount of particle sublimation and evaporation for the 5 micron particles entering the engine core (22%).