Paper 21: Simulation of an Injection System with Delivery Pipe Cavitation Using a Digital Computer

Abstract

If a suitable computer program is available the specification of a projected fuel injection system may be examined at the design stage. As a development tool, the computer may be used to indicate trends and to supplement experimental data by providing operational details which cannot economically be measured. Such a program has been developed for a system comprised of a jerk pump with an atlas delivery valve, connected to a multi-hole nozzle by means of an unrestricted small bore pipe. Cavitation has been considered and the mathematical model is shown to be sound. As an example of the use of the program the results of an investigation to ascertain the influence of certain design parameters on the duration of the injection period in a small system operating at 1500 rev/min are reported.