摘要
对轴入式旋风子通过数值模拟和试验测试分析其阻力性能与效率性能。将气体相作为连续介质,采用κ-ε湍流模型,对流场进行数值模拟;将颗粒相作为离散体系,采用随机轨道模型,根据已算出的流场来计算颗粒轨道,分析其阻力与效率性能。计算时选用不同粒径的颗粒相进行模拟,从而得到不同工况下的阻力性能与效率性能。试验测试时,通过改变风速,测定不同风速下多管旋风的阻力损失以及额定流量下的除尘效率。并对模拟结果与试验作比较分析,阐明了利用数值模拟在工程设计实施前或产品生产(改造)前预测方案的实际效果与产品性能的可行性。
In this paper we would like to report the results of our investigation on axis-in type of cyclone and our analysis of its structure, which is quite different from the traditional ones. It was found that the axis-in type of cyclone comes not in tangential flow-in, rather in an axial inflow from the cyclone-tube. The process of a cyclone air-particle separation makes use of the centrifugal force of inertia on the role of the dust while it is rotating in the process of flow, so that the dust can be separated from the gas phase. Actually, the airflow in the cyclone turns to turbulent and very complicated in its moving direction, including radial, axial and tangential and some other forms of a typical three-dlmensional movement. It is just for this feature of multi-directional cyclone movement that it is popularly used for the train ventilation. In this paper, we have made simulation of this type of cy- clone movement, in which, κ - ε turbulence model is used for the intended simulation while the gas phase is seen as a continuous phase. In so doing, the random orbit model has been used to calculate the particle track for analyzing the resistant performance and efficiency on the basis of the flow field. In addition, particle phase can be taken as a discrete phase. Furthermore, different resistance losses of the multi-cyclone movement can be regained by changing the wind speed and the dust efficiency under the rated flow of 300 m^3/h, while the pressure loss of the 331 Pa of the axis-in cyclone derived from the numerical simulation can be expected to get closer to 315 Pa from the test. At the same time, the efficicneies of 40μm particle and 5 μm particle can be expected to reach 92.44% and 67.38% from the simulation and 91.46% , or 65.66% from the test. Thus, it can be concluded that the results of testing and the numerical simulation from the comparative analysis prove to be highly agreeable to each other. Through numerical simulation and experimental testing for this type of multi-cyclone, it is highly recommended to find research results from the production practice with necessary economic value.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2009年第1期58-62,共5页
Journal of Safety and Environment
