Abstract
A series of experiments was carried out to compare the fuel consumption and emissions characteristics of a diesel engine using sharp inlet and round inlet nozzle holes. The inlet condition is known to affect the cavitation and the turbulence in the nozzle and subsequently the spray. The nozzles were tested at a high and a low load condition at 1200 rpm over a given timing swing. The engine used is a 2 liter, 4 valve, single-cylinder diesel engine based on a Volvo production engine, equipped with an electronically controlled unit injector with variable injection timing. The sharp inlet nozzle showed higher smoke emissions at low load and a delayed combustion at high load.