On Discharge Capability and Swirl Generation Capability of Swirler
Fuel-air mixing process is one crucial key to determine the performance of a diesel engine, and it is crucially determined by swirl within cylinder. For generating strong swirl within the cylinder, a new device named swirler has been propounded. In the present paper, four swirlers have been employed to experimentally study the performance on both the discharge capability and swirl generation capability. The steady flow test bench was employed to study the both capabilities in macro-level. Then, a water-flow model was employed to observe the flow motion within the cylinder via the tested swirlers. The results indicate that adopting swirler with a suitable configuration could generate strong swirl without remarkable discharge capability loss.
Effect of the incylinder forced swirls on performance and emission of diesel engine
The combustion process plays the important role to improve performance and emission of diesel engine. To improve the rate of combustion process, the fuel-air mixing process should be accelerated. In this paper, based on the Double Swirl combustion chamber, from the macroscopic characteristics and simulation analysis, the effect of the incylinder forced swirls on performance and emission of diesel engine was studied. The results indicated that due to the incylinder forced swirls, the distribution of fuel concentration is more uniform, and the combustion process was improved. The performance of indicated heat efficiency in diesel engine had been increased by 2%, and the NO and soot emissions had been also decreased by 2% and 35% respectively.
Development of new 4-valve/cylinder small DI diesel engine
Abstract Nitrous oxide (NO x ) and the particulate matter contained in the exhaust given off by diesel powered vehicles have been identified as elements responsible for polluting the atmosphere. As such, these emissions have been the targets of increasingly strict emission control regulations. Plans are underway to introduce regulations that are even stricter some time early in the next century. The advanced thermal efficiency offered by diesel engines is a feature clearly desired for its potential contribution toward energy conservation and the reduction of global warming. Research and development on the highly thermal-efficient direct-injection diesel engine are progressing at a rapid pace in Europe where introduction of a carbon dioxide tax is under consideration.