Numerical study on flow field and separation performance of swirl-vane separator under rolling motion conditions

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Annals of Nuclear Energy Pub Date : 2024-11-16 DOI:10.1016/j.anucene.2024.111050

Li Liu , Yamin Li , Hanyang Gu

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Abstract

Swirl-vane separator is essential in marine nuclear SG for separating liquid droplets from gas flow. This study conducts 3D numerical simulations to investigate the impact of rolling amplitude (θ_m) and rolling period (T) on flow field and separation performance under rolling motion, incorporating additional inertia forces through a UDF. Results indicate that non-axisymmetric patterns in vapor velocity and total pressure fields exhibit periodic fluctuations, lagging approximately one-quarter period behind the separator’s movement due to inertia forces. The fluctuation of liquid volume fraction resembles a sinusoidal periodic pattern. Separation efficiency fluctuates in an “M” pattern within 10° < θ_m < 40° and 4 s < T < 8 s, and in a “W” at θ_m = 40° and 30°, with T = 2 s. Pressure loss fluctuation follows a “W” pattern. Increasing rolling amplitude and decreasing period intensify liquid film thickness variability near separator walls, reducing separation efficiency, increasing pressure loss.

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滚动运动条件下漩涡叶片分离器流场和分离性能的数值研究

漩涡叶片分离器是船用核安全气囊中必不可少的分离气流中液滴的装置。本研究进行了三维数值模拟，研究滚动幅度（θm）和滚动周期（T）对滚动运动下流场和分离性能的影响，并通过 UDF 加入了额外的惯性力。结果表明，由于惯性力的作用，蒸汽速度和总压力场的非轴对称模式表现出周期性波动，大约滞后于分离器运动的四分之一周期。液体体积分数的波动类似于正弦周期模式。分离效率在 10° < θm < 40° 和 4 s < T < 8 s 内呈 "M "型波动，在 θm = 40° 和 30° 时呈 "W "型波动，T = 2 s。滚动幅度的增加和周期的减小加剧了分离器壁附近液膜厚度的变化，降低了分离效率，增加了压力损失。

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来源期刊

Annals of Nuclear Energy 工程技术-核科学技术

CiteScore

4.30

自引率

21.10%

发文量

632

审稿时长

7.3 months

期刊介绍： Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.