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| Flow characteristics of solid-liquid two-phase pipes with swirl valve under different particle properties |
| MA Guangfei1,2,3*, JI Jiankang1, DING Peng1, MAO Wei4, FANG Yong1 |
| 1. Standard & Quality Control Research Institute, Ministry of Water Resources, Hangzhou Machine Design & Research Institute, Ministry of Water Resources, Hangzhou, Zhejiang 310012, China; 2. National Joint Engineering Laboratory of Fluid Transfer System, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China; 3. Key Laboratory of Fluid and Power Machinery(Xihua University), Ministry of Education, Chengdu, Sichuan 610039, China; 4. Bray(China)Control System Co., Ltd., Hangzhou, Zhejiang 311200, China |
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Abstract The Euler-Lagrangian method was used to carry out three-dimensional numerical simulation of the self-designed swirl valve, and the analysis was focused on the flow characteristics inside the swirl valve, the outlet flow of the pipeline and the pressure loss coefficient at different particle densities(1 900, 2 300, 2 650 kg/m3)when two kinds of small particles(10 μm)and large particles(200 μm)coexisted. The results show that the flow field inside the swirl valve will generate an eccentric swirl velocity field and a pressure field that deviate from the center of the base circle, and a local low pressure will form at the center of the eccentric pressure field. As the pressure energy decreases, the velocity of the fluid increases, resulting in swirling acceleration. The existence of the swirl valve causes vortexes of different sizes to be generated in the entire pipeline. At the exit of the swirl valve and the extension area of the swirl vortex, the content of particles is reduced. The smaller the particle size, the greater the speed at which particles are obtained from the fluid; the greater the particle density, the greater the drag coefficient, and the greater the energy loss. The higher swirl speed reduces the content of particles in the pipeline and helps the pipeline particle migration. Through experimental tests, we found that due to the existence of the swirl valve, a swirl gas column was formed in the interior; in the swirl valve and its system, the impurities contained in the swirl valve would rotate under the action of the swirl; this verifies the low pressure distribution and the swirl acceleration cha-racteristics of cyclone valve in the numerical simulation to a certain extent.
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Received: 08 April 2020
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