Influence of different tilt angles of steam injector nozzle on performance
A simulation study was carried out to investigate the effect of nozzle tilt on the performance of a steam ejector.The change rule of the influence of different tilt angles of the nozzle on the ejector elicitation performance was obtained.The re-sults show that the ejector elicitation coefficient is reduced due to the nozzle tilt.And the larger the tilt angle,the more severe the impact on its performance.However,the direction of nozzle tilt has no additional effect on the ejector''s ejection coefficient;Under design conditions,when the tilt angle is increased from 0°to 8°,the steam ejector ejection coefficient decreases from 0.405 to 0.284,a decrease of 30％;In the off-design condition,the ejection coefficients of all injectors increase rapidly and then de-crease slowly as the working fluid pressure increases from 190 kPa to 360 kPa;Flow inside the injector is affected by the nozzle tilt angle.This results in shifting the axis of the working fluid out of the nozzle.Moreover,the ejected fluid is unevenly mixed up and down,reducing the ejection coefficient.
Steam injectorNozzleTilt angleElicitation coefficientSimulation study
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