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

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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.
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汽车空气马达分配器线轴空气总截面积的计算
研究了活塞发动机气体动力学领域的一个实际问题,即结构参数和状态参数对气体通过配气机构流动过程的影响的分析估计。双缸发动机的气体交换过程是通过开启和关闭排气窗或带有活塞的滑阀来完成的。提出了一种计算汽车气动发动机滑阀配气器通流面积总平面的方法。利用r函数理论对滑阀空气分布器的入口和出口开口的预设面积进行了数学描述。研究了滑阀式空气分布器通流面积计算机计算程序的编制算法。所提出的算法已用于开发软件应用程序,用于计算由滑阀的入口和出口开口构成的区域,考虑其不同的可能配置。通过计算这些开口的流通面积,可以确定气动发动机气流分配系统中的空气损失,并确定压缩空气进出口的具体尺寸。在汽车气动发动机工作过程计算的通用动力学模型中,在确定滑阀配风器的速度、温度和风量时,将配风系统的计算结果和压缩进气参数作为一个单独的块给出。与内燃机相比,气动发动机在低转速下更经济、更环保。
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