Study of influence of processing parameters on performance of micro-nozzles

Résumé fourni par la source

Abstract The inevitable milling-induced surface defects are overlooked in studies on micro-thruster performance optimization, resulting in a significant discrepancy between theoretical and actual flow fields that cannot directly guide engineering applications. This paper adopts a scheme of systematically varying tool type, radius, and stepover, and conducts a theoretical validation with a thrust deviation of merely 0.16%. On the basis of thrust data and velocity contours, the micro-nozzle aerodynamic performance under various machining parameters is comparatively analysed. With attention paid to thrust magnitude and flow field stability, three tool types are evaluated in terms of overall performance. Results show that larger ball end mill radii and larger chamfer angles better resist the negative effects of increased stepover. Among standard cutters, the ball end mill yields the best overall performance, delivering about 2% higher thrust than other tools.