Staring down a nozzle

Researchers analyze the flow pattern inside a diesel engine injection nozzle to determine the relationship between various flow parameters and the occurrence of cavitation.

To understand the breakup process of a diesel spray, researchers from Huazhong University of Science and Technology set about to determine the phenomena that lead to primary and secondary breakup caused by interaction with the dense gas phase and collision with other liquid elements.

Knowledge of the spray-forming phenomena is essential to allow predictions of the spray behavior and the mixture preparation during the injection process. To reach future emissions standards, the fuel distribution inside the combustion chamber and the droplet size distribution must be controlled appropriately.