内燃机工程2017，Vol.38Issue(2)：101-106,6.DOI:10.13949/j.cnki.nrjgc.2017.02.018
水平布置水下排气管倒流界限试验及分析
Experiment and Analysis of Water Backflow Mechanism of Horizontal Exhaust Pipe Under Water
马有福 1岳荣 1郭雪岩 1王治云 1杨斌 1杨丽娟1
作者信息
- 1. 上海理工大学 能源与动力工程学院,上海 200093
- 折叠
摘要
Abstract
An experiment and analysis of the water backflow mechanism of a submerged horizontal exhaust pipe was conducted to make marine diesel engine exhaust under water without seawater backflow accident.According to the current studies of the counter current flow limitation (CCFL), the ratio of gas phase inertial force to liquid phase gravity was the main physical mechanism of water backflow in underwater exhaust pipe.To this end, a verification test was carried out by putting an exhaust pipe with inner diameter of 90mm in the place of 3m underwater.Results show that:the critical superficial gas velocities in exhaust pipe to prevent water backflow is within a certain range related to the length of water remaining in exhaust pipe.With the remaining water length increasing from 0.3m to 1.8m, the critical superficial gas velocity decreases from 13.0m/s to 7.8m/s, and accordingly the critical gas phase Wallis number decreases from 0.72 to 0.55.Then, based on the exhaust parameters of a real diesel engine, the effects of the key factors such as the exhaust pipe diameter, underwater depth of exhaust outlet and exhaust temperature on the critical superficial gas velocity were calculated and analyzed according to the critical gas phase Wallis number of 0.60.Results indicate that the critical superficial gas velocity increases with the increasing exhaust pipe diameter, meanwhile, the underwater depth of exhaust outlet and the exhaust temperature also have a certain effect on the critical superficial gas velocity because they are related with the exhaust density.关键词
内燃机/船用柴油机/气液两相流/气液逆向流动极限/水下排气/水倒流Key words
IC engine/marine diesel engine/gas-liquid flow/counter current flow limitation/submerged exhaust/water backflow分类
能源科技引用本文复制引用
马有福,岳荣,郭雪岩,王治云,杨斌,杨丽娟..水平布置水下排气管倒流界限试验及分析[J].内燃机工程,2017,38(2):101-106,6.
