To investigate the flow field characteristics of the cascade gas-liquid cyclone separator and understand the impact of the short-circuit flow,a specific flow pattern,on its performance,the Reynolds stress model and discrete phase model were used to numerically simulate the flow characteristics of the gas-liquid flow in the separator;the Q criterion was used to identify eddy current features.The result shows that the flow characteristics in the primary cyclone tube of the cascade gas-liquid cyclone separator are the same as those of the conventional cyclone separator.The structural change made by adding secondary cyclone creates a large number of local secondary vortices in the cyclone separator.At an inlet gas velocity of 7 m/s,the short-circuit flow rate in the primary cyclone tube is up to 70.28％of the inlet flow.The addition of secondary cyclone is of great importance to improve the performance of the separator.After two stages of separation,the cyclone separator is able to achieve complete separation of droplet size above 6 μm.The study provides ideas and data basis for the structure development of gas-liquid cyclone separator and the application of cascade type gas-liquid cyclone separators.
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