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Blockage of the Deep-Sea Mining Pump Transporting Large Particles with Different Sphericity

China Ocean Engineering 2023年第2期37卷 343-352页

作者： TENG Shuang KANG Can LI Ming-hui QIAO Jin-yu DING Ke-jin School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013China Zibo Product Quality Testing Research Institute Zibo 255063China Shanghai Marine Equipment Research Institute Shanghai 200031China

The present study aims to plumb blockage of the deep-sea mining pump transporting large particles with different shapes. A numerical work was performed through combining the computational fluid dynamics(CFD) technique and the discrete element method(DEM). Six particle shapes with sphericity ranging from 0.67 to 1.0 were selected. A velocity triangle is built with the absolute, relative, and circumferential velocities of particles. velocity triangles with absolute velocity angles ranging from 90° to 180° prevail in the first-stage impeller. With declining sphericity, more particles follow the velocity triangle with absolute velocity angles ranging from 0° to 90°, which weakens the ability of particles to pass through the flow passage. Furthermore, the forces acting on the particles traveling in the impeller passage are analyzed. Large particles, especially non-spherical ones, suffer from high centrifugal force and therefore move along the suction surface of the impeller blades. Non-spherical particles undergo great drag force as a result of large surface area. The distribution of drag force angles is featured by two peaks, and one vanishes due to *** particle sphericity declines, both magnitude and angle of the pressure gradient force decrease. Variation of the drag force and the pressure gradient force causes clockwise deflection of the centripetal force, resulting in deflection and elongation of particle trajectory, which increases the possibility of blockage.

关键词： deep-sea mining pump particle sphericity velocity triangle force angle particle trajectory blockage

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Aerodynamics Design of Two-stage Vane-less Counter-rotating Turbinec

引用

Journal of Thermal Science 2011年第5期20卷 406-412页

作者： Yang Zhou Huoxing Liu Wei Li Jun Zeng National Key Lab. on Aero-Engines Aero-Engines Simulation Research Center Beijing Univ. of Aero. ＆ Astro. Beijing 100191 China Zhuzhou Aviation Powerplant Research Institute Zhuzhou 412002 China China Gas Turbine Establishment Chengdu 610500 China

It is one of the most efficient ways to greatly improve aero-engines' performance by utilizing vaneless counterrotating turbine(VCRT) *** supply sufficient power,VCRT turns to be high Mach number,large flow angle at high-pressure turbine(HPT) rotor exit,and low blade camber angle,which increase difficulties to turbine *** the axial velocity ratio of HPT rotor is much larger than the conventional ones,the optimal selection of VCRT velocity triangles based on theoretical analysis is developed,and how the efficiency varied by HPT stator/rotor exit flow angle is also figured *** key points to design a high efficient practicable VCRT are to select velocity triangles that are characterized by low flow coefficient,high outlet flow angle and large axial velocity ratio of HPT ***,performance comparison between convergent blade and convergent-divergent blade shows the latter is more appropriate for VCRT.

关键词： counter-rotating turbine vaneless velocity triangle aerodynamic design

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