분사펌프의 흡인관 경사와 구동관로 위치변화에 대한 유동특성

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분사펌프|흡인관 경사|구동관로 위치변화
A jet pump is a fluid carrying device which spouts fluid of high pressure from a driving engine pipe and absorbs fluid of high pressure whose pressure is increased through exchange of momentum with surrounding gas of low pressure.
It is applied for various types of industries such as heat engines, water power and thermal power plants, ducts for air conditioning, chemical and petroleum chemistry, food and environment industry in that it provides smooth operation in absorbing solid as well as fluid and gas.
Vapor-vapor jet pump are widely used for absorption, mixing and dehydration in industrial fields and fluid-gas jet pumps have been considered most important for air conditioners to control a variety of harmful gases and to create pleasant environment of structures.
Jet pumps can be easily constructed and installed irregardless of size of systems, can be easily used at the places involved in fluid and have little need of maintenance, and its expense is reasonable.
This study is to identify floating characteristics of jet pumps, mean velocity, distribution of total pressure through CFD analysis. For the purpose, it changed the ends of driving duct with diameter ratio of 1 : 3.21, 1 : 2.25, and 1 : 1.86, found optimal points of driving engine ducts in each diameter ratio and conducted the analysis through PIV experiment. The results are presented as follows:
(1) We define the highest fluid efficiency case for the suction pipe of angle was 45° suction pipe angle, as increase an entrance condition of velocity was fast and fluid efficiency suck in suction pipe was more high.
(2) When the ends of each driving duct with diameter ratios of 1 : 3.21, 1 : 2.25 and 1 : 1.86 were placed in 1.333, 1.213 and 1.133, the largest effect of absorption was found, but the effect was not related to velocity change.
(3) For velocity distribution of the main duct when driving duct were placed at optimal points according to diameter ratios, more than 33% the velocity at the wall increased.
(4) When the end of driving duct was located in the center of the absorption duct, average 11% of efficiency decreased compared to the case that it was placed at the optimal point. When it was extended over optimal point, mean 23% of efficiency deceased. As the driving duct was longer, flow quantity efficiency was lower, and when the end of driving duct was placed at optimal point, flow quantity efficiency was the best.
(5) When a diameter condition of driving duct was 1 : 3.21, the efficiency was the best, and as inlet velocity was faster, the efficiency increased, The flow quantity efficiency of 1 : 3.21 was 32% higher than that of 1 : 2.25, and the flow quantity efficiency of 1 : 3.21 was 46% higher than that of As the ratio of the expanded duct to driving duct increased, the efficiency decreased.
Alternative Title
Flow Characteristics a Jet Pump by Inclined Suction Pipe and Change the Position of Driven Pipe
Alternative Author(s)
Kim, Noh-Hyeong
조선대학교 대학원
일반대학원 기계공학과
Awarded Date
Table Of Contents
第1章 序論 = 1
第1節 연구 배경 = 1
第2節 연구의 목적 = 4
第2章 理論的 背景 = 7
第1節 Jet Pump의 이론식 = 7
1. Jet Pump 내의 유동 지배방정식 = 7
第2節 CFD 이론적 배경 및 이론식 = 10
1. CFD 이론적 배경 = 10
2. 유한체적법 = 11
第3節 PIV 실험의 이론적 배경 및 이론식 = 19
1. PIV를 이용한 속도장 측정 = 19
第3章 數値解析 = 29
第1節 CFD 실험 = 29
1. 경사진 흡입관 실험 = 29
2. 구동관로 실험 = 32
第2節 CFD 해석 = 35
1. 경사진 흡입관의 각도변화에 대한 해석 = 35
2. 구동관로의 위치변화에 대한 해석 = 61
第3節 PIV 계측실험 = 101
第4節 PIV 결과 및 고찰 = 105
1. 경사진 흡입관의 각도변화에 대한 PIV 결과 및 고찰 = 105
2. 구동관로의 위치변화에 대한 PIV 결과 및 고찰 = 112
第4章 流量效率 = 118
第1節 각도변화에 대한 경사진 흡입관의 유량효율 = 118
第2節 위치변화에 대한 구동관로의 유량효율 = 119
第5章 結論 = 121
조선대학교 대학원
김노형. (2008). 분사펌프의 흡인관 경사와 구동관로 위치변화에 대한 유동특성.
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General Graduate School > 3. Theses(Master)
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