Numerical Study on Influence of Supply Hole Angle on Radial Pre-swirl System
In order to reduce the flow resistance and increase the temperature drop of the aero-engine radial pre-swirl system,the flow characteristics inside the supply hole was studied and a three-dimensional model of the radial pre-swirl system was established.The numerical simulation was conducted to study the features of different pre-swirl systems at different pre-swirl nozzle angles and in rotational Reynolds numbers.The results show that as the angle of the supply hole increases,the vortex inside the hole gradually decreases,which improves the flowability of the supply hole.Temperature drop coefficient increases with the supply hole increases,and the increase of temperature drop coefficient is larger in high rotational Reynolds number,up to 19.3％.After the angle of supply hole is increased,the discharge coefficient is significantly improved,up to 64.9％,which reduces the flow resistance of the system,thus the discharge coefficient of the pre-swirl nozzle outlet and the system dimensionless mass flow rate being improved.
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