Research On Test And Filtration Theory Of Engine Air Filter Element Formed With Micron Wood Fiber

At present, the air filter element sold on the marketplace is mainly made up of filter paper impregnated by resin, the shortcomings of which are short service life and high operational costs. Meanwhile, the working performance is unreliable under the bad condition and the waste paper filter is difficult for disposal. In this paper, the micron wood fiber is developed by precision machinery processing planing technology based on innovative design idea, which breaks through the traditional processing technology of wood raw material. Furthermore, replying on foaming and definite proportion mould pressing technology, the engine air filter element with micron wood fiber can be manufactured.In this paper, present situation of engine air filter element and micro wood fiber are introduced, the feasibility and the future demand of air filter element with micron wood fiber are analyzed, the classification of the engine air filter element and aerosol is expatiated, the main performance index which affects the air filter element of the engine is analyzed and test method for air filter element of engine is described. Furthermore, mathematical description basis of the fiber filtration is founded and inertial effect, blocking effect and diffusion effect of single fiber in the Kuwabara flow field are combined in order to obtain mathematical description of the overall filtration efficiency of micron wood air filter element of engine. Meanwhile, the mathematical expression of filtration resistance is given. In succession, the three-dimensional model of air filter element with random distribution fiber is set up and the filtration process is simulated by FLUENT software, so the filtration efficiency curve and the resistance curve can be obtained. Comparing filtration efficiency and filtration resistance obtained by mathematics describe with the result obtained by three-dimensional virtual simulation and revising, based on which, analyze the influence factor of filter performance of micron wood fiber air filter element. The result that filtration efficiency and resistance will raise with the increase of filter thickness and filling rate, which will lay a solid theoretical foundation for our study on the micron wood air filter element of engine.In this paper, production process and key technologies for produing filter element is researched by theoretical and experimental method and the optimization design about critical parts and assemblies that produce micron wood fiber is conducted. Meanwhile, the micron wood fiber is manufactured and the process parameters that the filter element with micron wood fiber is hot compressed in lab is concerned initially. Furthermore, the image recognition of the specimen geometry parameters is made by minimum-squared-error method and the engine filter element with micron wood fiber is prepared based on theory and test.Lastly, according to the engine air filter monitoring indicators, the exhaust fan and the dust ejector are designed, and the sensors and data acquisition module etc. are choiced, so the engine air filter detection system is formed. At the same time, the program whose error and precision meets with the demand of concerned standard is set up by KingView6.5 software. Using this detection system above mentioned to measure the micron wood fiber filter element, the result shows that the detected filter element can meet the demand of QC/T 32-2006 national industry standards and JB/T 9747-2005 corporate standards. Besides, it can be indicated clearly that by comparing the micron wood fiber filter element with the original paper filter of automobile, that the former has slightly better dynamic and more fuel-efficient than the latter.