液体粘性对离心式喷嘴喷雾浓度分布和喷雾锥角影响的理论与试验研究

THEORETICAL AND EXPERIMENTAL RESEARCH OF THE EFFECTS OF LIQUID VISCOSITY ON LIQUID DISTRIBUTION OF A PRESSURE-SWIRL ATOMIZER AND ITS SPRAY CONE ANGLE

关键词:  涡流式喷嘴  燃料雾化  燃料喷射  粘性  理论  试验

Key words:  Wortex injector  Fuel pulverization  Fuel spray  Viscosity  Theory  Test

摘要:

本文从理论和试验上研究了液体粘性对离心式喷嘴喷雾浓度分布,喷雾锥角和雾化粒度的影响,建立了喷嘴后方液体浓度分布的物理数学模型.首次考虑了喷嘴出口空气涡的影响,给出了浓度分布、喷雾锥角和索太尔平均直径的计算方法.运用激光散射测雾技术,对喷嘴在静止空气中的雾化特性进行了研究,给出了喷雾锥角和索太尔平均直径的经验公式,并从试验上验证了所建立的数学模型.

Abstract:

The effects of liquid viscosity on liquid distribution in downstream of a pressure-swirl atomizer and its spray cone angle and atomization characteristics are studied theoretically and experimentally .A physical-mathematic model of liquid distribution downstream from the atomizer as well as spray cone angle is established, in which the effect of the air core in atomizer is considered for the first time. The concentration distribution, spray cone angle and Sauter mean diameter (SMD) calculation methods are also given and discussed in detail. Meanwhile, an expression for the pressure-swirl atomizer spray cone angle is suggested based on the experimental results.With the optical diagnostic technique, the atomization characteristics of the atomizer in stagnant air is studied experimentally. Empirical correlations of spray cone angle and SMD are proposed. The mathematic model is verified experimentally.This work will be considered essential to determine fuel concentration at a certain cross section of the combustion chamber downstream from the atomizer ring in a ramjet.