Fuel injection nozzle used on small bore diesel engine with swirl combustion chamber

The paper analyses the present conditions of the domestic small bore diesel engine with swirl combustion chamber, and points out that a single kind of nozzle cannot match with the swirl chamber diesel engine with different piston swept volumes, through theoretic analysis and calculation. In order to optimize power performance, fuel economy, exhaust emission, noise and reliability, diesel engine must have reasonable injection duration, and diesel engine with the different piston swept volumes should match the nozzle with different flux. Relationship between needle flux section, volume caused by needle's movement, section volume and fuel delivery per cycle per cylinder and their effect on injection and performance of diesel engine were analysed. A designing scheme for a series of needle nozzles according to domestic actual conditions, and experiment elementary with the sample were given. The test results show that the fuel economy and smoke of diesel engine are better and the whole performance is improved.