Calculation of the total cross-sectional area of the spool air of the distributor of an automobile air motor

Abstract

One of actual issues in the field of gas dynamics of piston engines which concerns the analytical estimation of influence of structural and regime parameters on the processes of flowing of gases through gas distribution mechanisms is examined. Gas interchange process in two-tact engines is performed by means of opening-closing of blow-off windows or slide-valve with a piston. The method of calculating the total plane of the flow area of slide-valve air distributor for a motor-car pneumatic engine is proposed. The mathematical descriptions of the pre-set areas of the entry and exit openings of slide-valve air distributor have been performed with the help of the theory of R-functions. The algorithm for creating the computer calculating program for determining the flow area of slide-valve air distributor is considered. The proposed algorithm has been used for developing the software application intended for calculating the areas which are formed by the entry and exit openings of slide-valve accounting for their different possible configurations. The calculations of flow area of these openings allow determining the air losses in the air distributive system of pneumatic engine and defining the specific size for the inlets and outlets of the compressed air. The results of calculations of the air distribution system and the parameters of the compressed air intake is presented as a separate block in the general dynamic model of calculations of working processes of the motor-car pneumatic engine, when determining the speed, temperature and air flow of the slide-valve air distributor. The motor-car pneumatic engine is more economical and environmentally friendly in comparison with the internal combustion engine at the low revolutions.