이젝터의 흡입관 경사와 위치변화에 따른 유동특성에 대한 연구

Abstract

ABSTRACT

A Study on the Flow Characteristics an Ejector by Inclined Suction Pipe and Change of Position of Driven Pipe

Jhung Hyung-Kyu Advisor : Prof. Lee Haeng-Nam Mechanical & Metallurgical Education Chosun University Graduate School of Education

The ejector is generally used to get a low pressure and improved the flow efficiency. It is applied to a lot of industry field like a heat engine, a fluid instrument power plant, petroleum chemistry, food industry, environment even it is mixed with a any kind of liquid, gas, and solid. This study is to identify floating characteristics of Ejectors, mean velocity, distribution of total pressure through CFD(Computational Fluid Dynamics) analysis. For the purpose, it changed the ends of driving duct with diameter ratio of 1 : 3.75, 1 : 2.64, and 1 : 1.79, found optimal points of driving engine ducts in each diameter ratio and conducted the analysis through PIV(Particle Image Velocimetry) experiment. The results are presented as follows:

(1) At 45° , when it was found that eddy flow increased due to increased absorption speed, this study suggests that the condition of curvature design for absorption tube in respect to further speed conditions should be considered important.

(2) When turbulence momentum energy increased, dissipation value also increased and energy loss was found. To decrease the energy loss, this study suggests that we have to find a configuration of nozzle and optimal points from the points when energy value of turbulence movement increased.

(3) This study analysed PIV at optimal points according to diameter ratios of Ejector and found that CFD flowing is consistent with PIV flowing.

(4) When the ends of each driving duct with diameter ratios of 1:3.75, 1:2.64 and 1:1.79 were placed in 1.3, 1.2 and 1.1, the largest effect of absorption was found, but the effect was not related to velocity change.