Gas-liquid two-phase flow atomizing nozzle and design method therefor

摘要

A gas-liquid two-phase flow atomizing nozzle and a design method therefor. Said nozzle consists of a nozzle core (1), an outer sleeve (2) and an atomizing body (3); an inner cavity of the nozzle core (1) consists of an inlet tapered section (4), a jet flow section (6) and an outlet diffusion section (7); the outlet diffusion section (7) of the nozzle core (1) is connected to an atomizing body mixing chamber (16), the jet flow section (6) of the nozzle core (1) is in communication with external atmosphere through a core air inlet hole (5), an air inlet buffering chamber (13) and a sleeve air inlet hole (12). Associating, by means of a new relational expression, design parameters such as the volume median diameter D0.5 of spray droplets of the nozzle with geometrical dimension parameters, and providing design formulas of the diameter D1 of the jet flow section (6), the length L1 of the jet flow section (6), the diffusion angle β of the outlet diffusion section (7), the maximum inner diameter D2 of the atomizing body mixing chamber (16) and the width b of the air inlet buffering cavity (13) make the nozzle have the characteristics of a small flow rate, a low spray pressure and a large droplet size, being able to improve the plant-protection machinery operating efficiency and the pesticide utilization rate.