Influence of the inlet cross-sectional shape on the performance of a multi-inlet gas cyclone

The effect of the two types vortex finder on the performance of the single and double inlet cyclone separators was experimentally investigated. In particular, the collection efficiency, pressure drop, and overall performance of single inlet cyclone separator with a cylindrical vortex finder, single inlet cyclone separator with an inverted-cone vortex finder, double inlet cyclone separator with a cylindrical vortex finder, and double inlet cyclone separator with an inverted-cone vortex finder were obtained and compared. The results show that the increasing diameter of the vortex finder would decrease the collection efficiency and pressure drop of the double inlet cyclone separators and increase the overall performance. It also found that inverted-cone vortex finder provides higher collection efficiency and pressure drop. Furthermore, when the vortex finder shape of the single inlet and double inlet cyclone separator changed, the variation of the collection efficiency and pressure drop was different, which is the same as changing the cyclone from a single inlet to double inlet.

Experimental study of large-scale single and double inlet cyclone separators with two types of vortex finder

An Overview of Numerical Simulations on Gas-Solid Cyclone Separators with Tangential Inlet

Development of an integrated multichannel inlet for improved particle classification in hydrocyclones

It has been shown that tangential inlet return cyclones are commonly used for inlet air filtration of off-road vehicle engines. The wear of the engine elements, and thus their durability, is determined by the efficiency and accuracy of the inlet air filtration. It has been shown that the possibilities of increasing the separation efficiency or decreasing the pressure drop of a cyclone by changing the main dimensions of the cyclone are limited, because any arbitrary change in one of the dimensions of an already operating cyclone may cause the opposite effect. A literature analysis of the possibility of increasing the filtration efficiency of cyclones by modifying the design of selected cyclone components was conducted. In this paper, three modifications of the cyclone design with a tangential inlet of the inlet air filter of a military tracked vehicle were proposed and performed. The symmetrical inlet of the cyclone was replaced with an asymmetrical inlet. The cylindrical outlet tube was replaced with a conical tube, and the edges of the inlet opening were given an additional streamlined shape. The modification process was carried out on three specimens of the reversible cyclone with a tangential inlet. After each modification, an experimental evaluation of the modifications was carried out. The influence of the modifications on the cyclone’s efficiency characteristics and pressure drop was examined. Subsequent modifications of the cyclone were performed on the same specimen without removing the previous modifications. Tests were performed in the air flow range QG = 5–30 m3/h. Polydisperse “fine” test dust with grain size dpmax = 80 µm was used for testing. The dust concentration at the cyclone inlet was set at 1 g/m2. The performed modifications caused a slight (about 1%) increase in separation efficiency in the range of small (up to QG = 22 m3/h) flux values and about 30% decrease in pressure drop in the whole range of the QG flux, which positively influences the increase in engine filling and its power. There was a noticeable increase in filtration accuracy in the range of low and high values of QG flux, which results in a decrease in the wear of engine components, especially the piston-piston ring-cylinder (P-PR-C) association, and an increase in their durability.

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Experimental Investigation of Possibilities to Improve Filtration Efficiency of Tangential Inlet Return Cyclones by Modification of Their Design

In solid particle separation process, cyclone separators are commonly used due to their simplicity and low-cost manufacture. A reference design S1 and two novel designs C4, N4 of four-inlet cyclone separator have been investigated computationally using the Reynolds Stress Model for turbulent flow and the Discrete Phase Model for tracking the particles. The numerical model has been validated and confirmed to be a reasonable good candidate for the investigation. The results show that, the design S1 provides the lowest average Euler number (4.415) and the design C4 provides the smallest average cut-off diameter (1.399 μ m ). As comparing the performances using weighted sum method, both two novel designs provide the better performance than the reference design S1. The innovative design N4 delivers the best performance which is 1 % and 0.1 % better in performance than S1 and C4, respectively.

Numerical investigation on the performance and flow pattern of two novel innovative designs of four-inlet cyclone separator

Multi-objective optimization of a novel vortex finder for performance improvement of cyclone separator

Cyclone separators are widely used in many industries to separate solid particles from the fluid flow. As same as separation efficiency, pressure drop is considered as a primary parameter to evaluate performance of cyclone separators. Computational Fluid Dynamics (CFD) is a powerful method to predict the pressure drop of cyclone separators. However, it is indisputable that CFD technique is mathematically complicated and computationally expensive. This study has proposed a more accurate, computationally efficient hybrid method to predict cyclone pressure drop by merging CFD and Deep Learning algorithms. Its generalization has been validated by k-fold cross validation. The proposed hybrid method has also been proved to be more superior than the DNN regression method. The results verify that the proposed method not only predicts cyclone pressure drop accurately (with a maximum error less than 5% in comparison with experimental data), but also requires less computational time than traditional CFD. In other words, it leverages the potential of novel approaches to decrease CFD computational cost while increasing the accuracy level. 

Dang Khoi Le

Papers

Numerical investigation on the performance and flow pattern of two novel innovative designs of four-inlet cyclone separator

Multi-objective optimization of a novel vortex finder for performance improvement of cyclone separator

A hybrid CFD – Deep Learning methodology for improving the accuracy of pressure drop prediction in cyclone separators

Numerical investigation on the swirling vortical characteristics of a Stairmand cyclone separator with slotted vortex finder

A Hybrid Cfd – Deep Learning Methodology to Improve the Accuracy of Cut-Off Diameter Prediction in Coarse-Grid Simulations for Cyclone Separators