High-speed shadow imaging in internal flow pattern and macroscopic characteristics of a R134a flash-boiling spray discharged through a vertical twin-orifice atomizer

被引：16

作者：

Ju, Dehao ^{[1
]}

Fang, Junhua ^{[1
]}

Zhang, Tingting ^{[1
]}

Qiao, Xinqi ^{[1
]}

Xiao, Jin ^{[1
]}

Huang, Zhen ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Minist Educ, Key Lab Power Machinery & Engn, Shanghai 200240, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MULTIPHASE FLOW | 2015年 / 75卷

基金：

中国国家自然科学基金;

关键词：

Flash-boiling atomization; Twin-orifice atomizer; High-speed shadow imagery; R134a; DME; Multi-threshold; R-134A;

D O I：

10.1016/j.ijmultiphaseflow.2015.06.002

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

This work is to investigate the internal flow pattern and macroscopic spray characteristics of R134a discharged through twin-orifice atomizers. Two inlet orifices with the diameters of 0.6 mm and 3.0 mm were subsequently implemented and connected to the supply line of R134a to find the influence of the inlet orifice geometry on flow and spray characteristics. Transparent atomizers were manufactured to study the effects of different diameters of discharge nozzles on the internal flow and atomization. An injection pressure of 6.0 MPa was operated to produce "stable" flash-boiling sprays vertically, and the ambient condition was atmospheric. Internal flow in the expansion chamber and external liquid atomization were observed simultaneously during the actuation. The relationship between the internal boiling flow in the expansion chamber and external flash-boiling spray were analyzed. A "sudden" gas-liquid transition was observed when the inlet/discharge orifice ratio is one. This work provides a guide and reference for the volatile or liquefied material discharged through a twin-orifice atomizer. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：224 / 236

页数：13

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