Fuel-Injection System Calculations

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Abstract
A simplified method of calculating injection system performance has been developed for the use of applications engineers. It is particularly relevant to the problem of avoiding secondary injection and dribble. The calculation of the complete behaviour of injection systems has been programmed for a digital computer. Agreement with experiment is satisfactory and confirms that all important factors have been taken into account. These factors are quoted and the methods used for dealing with compression waves in the pipes are described in detail. Viscous friction and voids in the fuel are taken into account. As an example of the use of the programme, an approach to the problem of stroke to stroke variations of delivery in one line is described. A longer term objective is the reduction of the time required to match injection equipment to engines by using this and other computer programmes instead of experimental methods, up to the final trial stage.

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