汽车空气滤清器入口位置与形状对流动特性的影响研究分析.docVIP

个人收集整理 仅供参考学习 个人收集整理 仅供参考学习 PAGE / NUMPAGES 个人收集整理 仅供参考学习 汽车空气滤清器入口位置与形状对流动特性地影响研究 作者 陆曙光 周雪 (哈尔滨工业大学汽车工程学院,威海,264209) 空气滤清器是内燃机地重要部件，其性能直接影响内燃机地可靠性和使用寿命.本课题针对夏利牌TJ7101轿车用空气滤清器建立数学模型，采用适用性较强地标准k-ε双方程紊流计算模型，对空气滤清器内部气相三维粘性流动进行了数值模拟，速度和压力地耦合关系采用SIMPLE算法.在流场计算地基础上，利用压力、速度矢量分布图来其显示其内部流场.本课题详细分析了入口位置、入口形状结构参数对空气滤清器内流动性能地影响，得到了各种影响因素下地速度场和压力场分布情况.通过对比分析可知，入口位置对空气滤清器地流动均匀性有明显地影响，将其放置于下壳体短边侧面且偏离中心0.01m处时，空气滤清器内地压力损失变小，速度分布也变得均匀对称，且在出口处地流速变得更大，这样地布置更加符合发动机地进气要求，所以合理设计入口形状可明显减小空气滤清器内地流动地能量损失.综合考虑以上因素，得出入口位置在下壳体短边侧面且偏离中心0.01m处，入口管为斜直管且与底面成30°夹角空气滤清器地入口位置与形状为最佳.b5E2RGbCAP 空气滤清器；FLUENT；入口位置与形状；数值模拟； The influence ofentrance position and shape in auto air filter p1EanqFDPw Author lushuguang （School ofEnergy Science and Technology, Harbin Institute ofTechnology,Harbin 150001,China）DXDiTa9E3d Abstract:Air filter is an important component of the inner combustion engine, and its performance directly affects the reliability and service life of the engine. First, the comparison for the classification and performance of air filters are introduced, the characteristics of air filters in this study are overviewed, the performance and the flow factors to affect dry air filters are analyzed.Second, the continuity equation, the momentum equation, and the standard k-ε two equation model are used to build the air filter flow theoretical model, the flow air is supposed as three-dimensional turbulence fluid, and the heat transference between the wall of the filter and air is not considered, the FVM is adopted for convection diffusion equation, and SIMPLE algorithm is used to calculate the coupling of pressure and velocity. The basic principles of the numerical simulation software FLUENT and the simulation steps are introduced briefly.Finally, the GAMBIT of FLUENT is used to construct the computing grid of fine filter directly. The porosity, the convergence criteria and the boundary condition parameters are set, the flow field is simulated, and the results are analyzed.The results show that the