Experimental study and numerical simulation of the characteristics of a percussive gas

Wu, X., Wang, X., & Zhou, Y. (2018). Experimental study and numerical simulation of the characteristics of a percussive gas–solid separator. Particuology, 36, 96-105. https://doi.org/10.1016/j.partic.2017.04.007

Experimental study and numerical simulation of the characteristics of a percussive gas–solid separator

Xuecheng Wu, Xiao Wang, Yonggang Zhou ^*

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

10.1016/j.partic.2017.04.007

Volume 36, February 2018, Pages 96-105

Received 11 July 2016, Revised 8 February 2017, Accepted 19 April 2017, Available online 24 August 2017, Version of Record 22 December 2017.

E-mail: trooper@zju.edu.cn

Highlights

• Particle trajectories in the separator were measured using particle-trajectory imaging method.

• Changes of particle characteristic angles under different conditions were analysed based on DPM.

• The characteristics of particle motion within the separator were modelled.

• Changes in separation efficiency, pressure loss and exhaust gas flow rate were calculated.

Abstract

The presence of solid particles in the flow of hypersonic wind tunnels damages the appearance of the experiment models in the wind tunnel and influences the accuracy of experimental results. The design of a highly efficient gas–solid separator was therefore undertaken. Particle trajectory imaging methods were used to measure trajectories under different conditions. The flow field and particle movement characteristics for different head angles (HAs) and separation tooth angles (STAs), inlet velocities, and the exhaust gas outlet pressures in the separator, were calculated using simulations based on the discrete phase model. The particle separation efficiency, pressure loss, and flow loss resulting from different structural parameters were also studied. In line with experimental observations, the characteristic angle of particle movements in the separator and the separation efficiency of the separator were found to increase with decreasing HA and with increasing STA. Separation efficiency improves with increasing inlet velocity and with increasing negative pressure of the exhaust gas outlet; however, the corresponding pressure loss and the flow rate of the waste gas also increased.

Graphical abstract

Keywords

Gas–solid separation; Trajectory imaging; Collision of particles; Numerical simulation; Efficiency of separation

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