Numerical investigation of flow characteristics of a pre-swirl system with two outlet structures:straight and oblique mortise groove
Three-dimensional numerical calculation methods were used to simulate the pre-swirling system with two different outlet structures:straight and oblique mortise groove,for a certain aero-engine,the effect of changing the outlet geometric structure of the pre-swirling system on the gas flow characteristics and pressure loss of the blade air supply channel was studied.Results were compared with one-dimensional engineering calculation methods,outcome shows show that changing the straight mortise groove structure to an oblique one has little effect on the pressure loss of the blade air supply channel.The inlet and outlet flow rates of the pre-swirl systems of the two structures are slightly different,and there are slight differences in the flow distribution of each cavity at the outlet of the system.The dimensionless flow rates at the inlet and the outlet of the system calculated numerically are slightly different from those calculated by engineering methods,while the non-dimensional flow rates at the outlet of the upper and lower seals are significantly different,with a relative deviation of nearly 50%,the flow and heat transfer in the regions of the upper and lower seals are complex,requiring the use of three-dimensional numerical simulation calculations to enhance design accuracy.
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