车载高效离心风机内部流动的数值模拟
发布时间：2018-07-23 11:05
【摘要】：车载离心风机要求结构紧凑、重量轻、出口压力相对较高,但传统设计方法精度低、参数取值范围大,往往不能满足风机优化设计的要求,这就需要对离心风机内部微观流动进行分析,提高风机的设计精度。论文分析了目前风机的设计方法以及理论研究现状,以离心风机为研究对象运用SOLIDWORKS软件建立了离心风机的几何模型,调入GAMBIT进行网格化分和边界条件设置,用FLUENT软件对风机流场进行了数值计算,得到了风机内部流场分布,并研究了风机结构参数对风机性能的影响。 通过研究表明,除叶片出口安装角之外,叶片进口安装角对风机性能的影响较显著。在进一步的研究中,分析了进口安装角、出口安装角、叶轮宽度、蜗壳出口扩压角以及叶片数量等结构参数对风机的性能的影响。随着叶片出口安装角、叶轮宽度、叶片数的增加,风机的全压都增加;随着风机叶片进口安装角的增加,风机全压先增加,然后减小,存在一个极值;随着蜗壳出口扩压角度的增大,风机全压有所增加,但当扩压角超过一定值后全压增加缓慢。基于研究结果对风机结构进行了优化,对结构优化风机流场的数值模拟结果显示风机设计合理、全压达到使用要求,静压裕量为7.12%。论文研究结果为离心式通风机的优化设计提供了一定的理论依据和参考。
[Abstract]:Truck centrifugal fan requires compact structure, light weight, relatively high outlet pressure, but the traditional design method has low precision and wide range of parameters, so it can not meet the requirements of fan optimization design. In order to improve the design precision of centrifugal fan, it is necessary to analyze the micro flow inside the centrifugal fan. This paper analyzes the design method and the current research situation of the centrifugal fan. The geometry model of the centrifugal fan is established by using SOLIDWORKS software, and the grid division and boundary condition setting are carried out with gambit. The flow field of the fan is numerically calculated with fluent software, and the distribution of the flow field inside the fan is obtained, and the influence of the structure parameters of the fan on the performance of the fan is studied. The results show that the influence of blade inlet installation angle on fan performance is significant except for blade outlet mounting angle. In the further study, the influence of the structural parameters such as inlet installation angle, outlet installation angle, impeller width, volute outlet diffuser angle and the number of blades on the performance of the fan are analyzed. With the increase of blade outlet angle, impeller width and number of blades, the total pressure of the fan increases, and with the increase of the inlet angle of the fan blade, the total pressure of the fan first increases and then decreases, and there is an extreme value. With the increase of expanding angle at the outlet of volute, the total pressure of fan increases, but when the angle of expansion exceeds a certain value, the total pressure increases slowly. Based on the research results, the fan structure is optimized. The numerical simulation results of the fan flow field show that the fan design is reasonable, the full pressure meets the operational requirements, and the static pressure margin is 7.12. The research results provide some theoretical basis and reference for the optimization design of centrifugal fan.
【学位授予单位】：中国石油大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH432
本文编号：2139198
[Abstract]:Truck centrifugal fan requires compact structure, light weight, relatively high outlet pressure, but the traditional design method has low precision and wide range of parameters, so it can not meet the requirements of fan optimization design. In order to improve the design precision of centrifugal fan, it is necessary to analyze the micro flow inside the centrifugal fan. This paper analyzes the design method and the current research situation of the centrifugal fan. The geometry model of the centrifugal fan is established by using SOLIDWORKS software, and the grid division and boundary condition setting are carried out with gambit. The flow field of the fan is numerically calculated with fluent software, and the distribution of the flow field inside the fan is obtained, and the influence of the structure parameters of the fan on the performance of the fan is studied. The results show that the influence of blade inlet installation angle on fan performance is significant except for blade outlet mounting angle. In the further study, the influence of the structural parameters such as inlet installation angle, outlet installation angle, impeller width, volute outlet diffuser angle and the number of blades on the performance of the fan are analyzed. With the increase of blade outlet angle, impeller width and number of blades, the total pressure of the fan increases, and with the increase of the inlet angle of the fan blade, the total pressure of the fan first increases and then decreases, and there is an extreme value. With the increase of expanding angle at the outlet of volute, the total pressure of fan increases, but when the angle of expansion exceeds a certain value, the total pressure increases slowly. Based on the research results, the fan structure is optimized. The numerical simulation results of the fan flow field show that the fan design is reasonable, the full pressure meets the operational requirements, and the static pressure margin is 7.12. The research results provide some theoretical basis and reference for the optimization design of centrifugal fan.
【学位授予单位】：中国石油大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH432
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