道路清掃車的改進外文文獻及翻譯--道路吸塵清掃車吸嘴的顆粒去除性能的數(shù)值模擬研究

1、中文 中文 9040 字出處： 出處：Powder Technology, 2010, 200(1): 16-24附錄ⅡNumerical study on particle removal performance of pickup head for a street vacuum sweeperSim-Lin Lau, Michael K. StenstromABSTRACTThe purpose of this paper is

2、to investigate the particle removal performance of pickup head for a street vacuum sweeper numerically. An integrated 3D numerical model was constructed based on particle suction process in computational fluid dynamics (

3、CFD) software. The airflow through the pickup head was treated as a continuum, while particles were modeled as dispersed phase. The Reynolds stress model (RSM) and discrete particle model (DPM) were chosen in order to pr

4、edict the air and particles flow accurately. The numerical simulation results show that the sweeper-traveling speed and the pressure drop across the pickup head have great effects on the particle removal performance. The

5、 removal efficiency of particles increases with the lower sweeper-traveling speed or the higher pressure drop, and small size particles have higher grade efficiency than that of large size particles under the same opera

6、ting conditions. Moreover, the removal mass flow rate of particles increases with the higher sweeper-traveling speed. Therefore, a trade-off should be considered among high removal efficiency, low energy consumption, and

7、 high removal mass flow rate. Through the numerical simulation, the effectiveness of street vacuum sweeper for removing particles from road surface is evaluated, and an optimal operating condition is obtained. Besides,

8、 more information is generated to better understand the particle suction process of the pickup head.Keywords: Pickup head; Particle removal performance ;CFD ;Sweeper-traveling speed Pressure drop1.IntroductionCurrently,

9、there is a widespread concern over the pollution of particle matter. Dust and silt are the major sources of particle matter pollution, the removal of which therefore attracts considerable attention [1]. Street sweeping i

10、s typically practiced to With the rapid development of the computer technology, the computational fluid dynamics (CFD) has been successfully adopted to study various industrial pneumatic conveying processes [9,10]. Altho

11、ugh many works have studied the particle removal performance by experiments over the past decades, few works considered the particle removal performance of pickup head using CFD. Xu et al. [11] conducted a 3D numerical s

12、imulation on the flow field of pickup head and gas system for a highway mechanical sweeper. They analyzed the interaction between the pickup system and the filter system, and optimized the combined system based on numeri

13、cal results. Zeng et al. [12] employed the CFD technology to simulate the flow field of pickup head. The study showed that the performance of street sweeping was improved significantly by changing the structure of pickup

14、 head, and the numerical simulation proved that the CFD was an effective tool to calculate the flow field characteristics of pickup head. However, these works did not account for the influence of particles on the flow fi

15、eld during the investigation, so the particle removal efficiency and the particle removal mass flow rate cannot be obtained. More importantly, influences of the sweeper-traveling speed and the pressure drop, which are th

16、e most important parameters, should not be neglected while modeling the performance of pickup head. Gas cyclone is the device that utilizes centrifugal force to separate particles from carrier gas, whereas pickup head fo

17、r a street vacuum sweeper is the device that employs vacuum pressure to suck up particles from road surface. Therefore, the particle removal performance of pickup head will be also calculated by using the CFD approach, w

18、hich has been validated by the successful investigation of the particle collection performance of gas cyclones [13,14]. The aim of the present study is to investigate the particle removal performance of pickup head under

19、 various sweeper-traveling speeds and pressure drop using commercial CFD program Fluent 6.3. The numerical CFD model is verified by sweeping field experiments. Based on the numerical results, the balance among the partic