The optimal control of aeroengine acceleration and deceleration processes is deeply investigated.

The idle deceleration process simulation of the engine is studied by using the CFD(Computational Fluid Dynamics)software and virtual prototyping software,and the deceleration process of the engine in different blow-by gas leak is stimulated,and it is validated by real-vehicle experiment.

Combining with the physical model of deep bed filtration and using conception of filtration bed cells, mathematic model of filtration resistance and filtration velocity of deep bed filtration under constant pressure is established.

In this paper based on operation of bag precipitator,the suitable operation factors is determined,as filtration velocity etc.

Both theorectical and experimental results show that the relation of the pressure drop and the filtration velocity is linear and follows Dacy law.

The present paper comprehensively introduced the difference between extruded ceramic filter and foam filter through filtration efficiency, consistent flow rate, good strength, high capacity and costs.

the present paper comprehensively introduced the difference between extruded ceramic filter and foam filter through filtration efficiency,consistent flow rate,good strength,a high capacity and costs.

The test results showed:(1)Using the suitable aid can increase the filtering rate effectively and the yield of dewaxing oil,decrease the oil content of slack wax and improve the quality of slack wax,without influenc.