Transactions of Nanjing University of Aeronautics & Astronautics
Numerical Investigation of Ice Crystal Impact Characteristics in Compressor Cascade
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Abstract:
Ingestion of the ice crystals in aircraft engines can lead to the thrust loss or even blade damage， posing a potential threat to flight safety. To investigate the impact characteristics of the ice crystals in the compressor cascade， a method is established to calculate the trajectories of ice crystal particles impacting the blade pressure surface and suction surface separately which can avoid the intersections of the particle trajectories. Based on this method， the effect of the particle size and shape on the ice crystal impact characteristics are numerically studied in details. Results show that the total collection coefficient increases with the increase of the particle equivalent diameter and aspect ratio. For the particles with the same shape， the total collection coefficient increases by 44.1% when the particle diameter increases from 20 μm to 50 μm； for the particles with the same size， the total collection coefficient increases by 39% when the particle aspect ratio increases from 0.1 to 10. The increase of the collection coefficient of the blade pressure surface is the main reason for the increase of the total collection coefficient. The blade leading edge is mainly characterized by the fragmentation of ice crystals and the blade surface is mainly characterized by the rebound of the ice crystals. In most parts of the blade surface， the ice crystal particles have a non-elastic rebound. In terms of the particle size， the distribution trend of the collection coefficient after the secondary impact is very similar to that of the primary impact， with a notable difference being a reduction of about 70% of the maximum value of the collection coefficient. However， in terms of the particle aspect ratio， the trend of the secondary impact collection coefficient at the leading edge of the blade is opposite to that of the primary impact， with elongated ice crystal particles exhibiting a lower secondary collection coefficient.
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This work was supported by the Fundamental Research Funds for the Central Universities （No. 3122025101）.
Clc Number:
V233.94
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