The Experimental And Numerical Study Of Cyclone Vortex Core Broken Wings

Being a typical gas-solid separation equipment, Cyclone separators’working mechanism mainly dependens on the density difference between the airflow and dust particles that causes speed slip and make the dust particles separated from the gas movement eventually. Early on, the cyclone sepatator was only widely used in industry,whereas it increasingly has been tremendously popular worldwide among various industry professionals at present. Currently, miniature cyclone separators have been gradually expanded to air purification, food separation, biology, medicine, and other precision industries. Cyclone separator has got unprecedented optimization in performance,cost and operational environment as its development year by year. The cognitive ability of people toward cyclone separators has been transformed from a simple qualitative performance analysis to quantitative analysis of the flow field characteristics so as to further optimize the performance. However, the phase flow varies unusually in the cyclone separator, many scholars have to consider the negative impact of the increased pressure drop as studying a variety of optimized cyclone separator Models to achieve high efficiency.This topic suggests a novel device for reducing the pressure drop in cyclone separator-blade, consider cyclone separators’characteristics of moderate efficiency and high pressure drop, trying to optimize the cyclone separator to ensure its purpose of " Keep effective while reduce pressure drop". Considerable previous research has been read to acquire a deep understanding of cyclone separator,we make use of computational fluid dynamics software (CFD) to simulate flow patten features and performance of traditional Lapple type cyalone separator and another one with drag equipment, which including three-dimensional speed pressure, vorticity, turbulence of flow field.Firstly, the subjects has established a physical Model,which include geometry of the various components, Model drawing, mesh generation and so on. At the same time, the numerical simulation theoretical Model should be set up,so do the initial conditions. Previous experimental results should be used to verify the above selected Model and operating parameters.Secondly, new drag reduction devices have been put forward based on the experimental results.The subject in the laboratory are traditional Lapple type cyelone separator and the ones with five groups of blade of different lengths,as the purpose is to get the actual value of main performance index——collection efficiency(η) and pressure drop. Reynolds stress Model (RSM) has been choosen as the numerical simulation method, the distribution of gas flow field, pressure distribution and flow field turbulence structure by calculating and analyzing the numerical results.The mechanism of blade length which influence the performance of cyclone separator has been studied and analyzed initially. Then,we use DPM discrete Model which based on Euler-Lagrange method to simulate distribution and motion within the separator of particles with different size on the basis of the single-phase flow field calculation. The force acted on individual particles in both traditional Model and optimized Model shoule be calculated for comparison, at the same time,the composite force of the centrifugal force and radial force of drag force (Fc+Fr) of multiple different size particles should be calculated in order to illuminate the particles’final trend.Finally, a large number of process variables need to be investigated to get fairing optimized design and confirm the main area of the pressure drop loss.The study on different parameters (density, width, grop etc.) of the drag blade which exert an influence on separation performance of cyclone separator based on the blade of 100mm has been conducted to analyze the mechanism of drag reduction. Then,the parameters of vortex finder have been studied and analyed to get a optimum cyclone separator design.