Optimization design of micro Laval nozzle under viscous force

Laval nozzles are widely used in aerospace, petrochemicals, metallurgy and other fields. In small-diameter Laval nozzles, the effect of viscous force is more pronounced, and there is relatively insufficient research on this type of Laval nozzle. This article selects several commonly used contraction section curves to analyze and compare the flow field of the contraction section of the micro Laval nozzle, and obtains a design method for the contraction section curve that is more suitable for the micro Laval nozzle.