The Thesis describes the design and operation of a piezo-electric indicator with associated photographic equipment and its application to the recording of certain characteristics of a Bosch Thjection System.
The Injection Process is explained on a basis of wave transmission of pressure and discharge characteristics in association ,eith needle.-valve lift are examined through- out a fairly wide range of operating conditions.
Important conclusions to be drawn from the investigations may be briefly summarised as follows:
(I) Djscharge increases with in-crease in pump speed and decreases with increasing needle tension, the decrease being relatively greater with longer pipe length.
(2) Initiation and termination Of discharge vary with pump speed, pipe length and needle tension, the former being largely affected by the residual pressure in the fuel line.
(3) Residual pressures fluctuate throughout the load and speed range examined and are of relatively high value with longer pipes at lower speeds.
(4) Injection occurs under pressures varying with pump speed and needle tension but relatively unaffected by pipe length.
(5) Injection at the lower speeds is characterised by irregular discharge under comparatively low nresaires. with increasing pump sneed, discharge occurs with increasing regularity under higher pressures and consecuent improvement in atomisation.
(6) post-Injection phenomena were not observed under the conditions investigated with normal delivery-valve setting.