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Gas-liquid two -phase jet calculations and experimental research

Author: CongWen
Tutor: ZhangBo
School: Dalian University of Technology
Course: Thermal Power Engineering
Keywords: Gas-liquid two -phase jet Main steam nozzle Simulation Outlet pressure
CLC: O359.1
Type: Master's thesis
Year: 2011
Downloads: 283
Quote: 0
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Abstract


Gas-liquid two-phase jet is a use of high pressure steam to drive the cryogenic liquid, so that the main steam pressure is increased from below to above the main steam pressure of a no-moving parts of the device. Gas-liquid two-phase jet is now being widely used in many fields, especially in the two-stage ejector refrigeration cycle system booster and used as nuclear reactor emergency cooling device. Gas-liquid two-phase jet purpose is to obtain a higher fluid outlet pressure. By gas-liquid two-phase jet nozzle throat cross-sectional area of ​​the main steam, the main steam nozzle position and a cross-sectional area of ​​the mixing chamber throat factors such as size and the main steam pressure and working pressure fluid ejector parameters. Mixing chamber is the gas-liquid two-phase gas-liquid two-phase jet direct contact with the part, involves a complex mass, momentum, and energy exchange. According to the gas-liquid two-phase jet theory, this paper experimentally studied its performance. And on the gas-liquid flow mixing chamber was simulated, the gas-liquid two-phase flow mechanism and flow characteristics are discussed. The main contents are as follows: (a) in the gas-liquid two-phase jet, based on mathematical analysis, this paper establishes a two-phase gas-liquid ejector mathematical model. According to the mathematical model of the injector, this paper proposes to R141b as the refrigerant liquid two-phase jet design methods. And by calculation of the main steam nozzle and the mixing chamber throat cross-sectional area and other major dimensions. In this paper, visual basic preparation of gas-liquid two-phase ejector design process, and affect the performance of the main steam ejector pressure, temperature of the liquid ejector and flow were calculated and analyzed. (2) in the gas-liquid two-phase ejector mixing chamber, the complex between the gas and liquid mass, momentum and energy exchange. In this paper, two-phase gas-liquid flow pattern determined on the basis of gas-liquid two-phase flow field were analyzed. Proposed a new two-phase flow ejector mathematical model and mathematical models for solving the finite difference discretization. Through simulation, the obtained two-phase flow mixing chamber pressure, speed, and void fraction distribution in the radial direction and the velocity distribution along the axis. Further validation phase flow inside the ejector mixing condensation mechanism. (3) This built-liquid two-phase jet to the core of the jet used to study the effect of boosting bench. In order to gain insight into the mixing chamber of the mixing mechanism and condensation shock generating mechanism, this paper designed a mixed diffusion chamber 16 pressure taps. This 16 gauge 5 rows of holes, evenly distributed in the mixed diffusion chamber. Then the structures needed bench generators, condensers and other experimental equipment and tank pressure sensors, temperature sensors, pressure gauge and measurement equipment for the selection. According to experimental gas-liquid two-phase ejector system diagram will be selected laboratory equipment, measurement equipment, and piping, etc. were installed. Before the injector for gas-liquid two-phase study, based on the gas-liquid two-phase jet impact properties of the main steam pressure boost, liquid flow ejector, the ejector pressure, the position of the main steam nozzle and the main steam nozzle size studied experimentally.

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CLC: > Mathematical sciences and chemical > Mechanics > Fluid Mechanics > Multiphase flow > Liquid, gas (vapor) two-phase flow
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