Temporal Flow Characteristics of Three-Dimensional Centrifugal Impeller Suction System at Vacuum Conditions

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2023-12-01 DOI:10.47176/jafm.16.12.1875

Y. Li, B. Zhang, Y. Chen, Z. Wang, H. Yang, Y. Wei

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Abstract

Temporal flow characteristics of a 3D centrifugal impeller suction system were numerically studied in vacuum conditions. The blockage of the high-speed rotating impeller appeared, which greatly dropped the suction of the layer suction device. The temporal flow characteristics of the 3D centrifugal impeller suction system were worthy of attention in vacuum conditions. Separation vortices were generated near the blade suction surface. The blocking mechanism of the passage was further analyzed at different extremely low flow rates through the time-space evolution of the streamline. The Q-criteria was introduced to analyze the vortex evolution within the fluid domain of the impeller. Vortex evolution law was captured—the vortices always generated near the suction surface of the blade and moved to the pressure surface of the adjacent blade in the same passage and disappeared. The uniform distribution of three stall cells was captured through the diagram of turbulent kinetic energy. The flow rate increased, and the vortex evolution period gradually decreased. The comparison of pressure fluctuations in different conditions further demonstrated the flow mechanism at the vacuum flow rate was different from that at low flow rates. The sharp increase of pressure fluctuations near the blade pressure surface was consistent with the phenomenon near the suction surface. The pressure fluctuation at extremely low flow was mainly composed of scattered fluctuations caused by fluid separation. The steady and unsteady characteristics described the internal flow characteristics of this suction system at vacuum-flow rates. Theresults provide a profound design for vacuum cleaners.

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真空条件下三维离心叶轮抽吸系统的时间流动特性

对三维离心叶轮吸力系统在真空条件下的时间流动特性进行了数值研究。高速旋转叶轮出现堵塞，大大降低了层吸装置的吸力。三维离心叶轮抽吸系统在真空条件下的时间流动特性值得关注。在叶片吸力面附近产生分离涡。通过流线的时空演化，进一步分析了不同极低流量下通道的阻塞机理。引入q准则分析了叶轮流体域内的涡演化。捕获了涡的演化规律，涡总是在叶片吸力面附近产生，并在同一通道内移动到相邻叶片的压力面后消失。通过紊流动能图捕捉了三个失速单元的均匀分布。流量增大，涡演化周期逐渐缩短。通过对不同工况下压力波动的比较，进一步证明了真空流量下的流动机理与低流量下的流动机理不同。叶片压力面附近压力波动的急剧增加与吸力面附近的现象一致。极低流量压力波动主要由流体分离引起的分散波动组成。定常和非定常特性描述了该抽吸系统在真空流速下的内部流动特性。研究结果为真空吸尘器的设计提供了深刻的启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .