Even though the average air-fuel ratio is lean, if proper care is not taken in the design process, regions of the combustion chamber can be fuel rich and lead to excessive smoke emissions. It is rather heated during combustion and exhausted-causing diesel exhaust to be lean. Yet, this extra air does not enter into the combustion process. Combustion Chamber Geometry Design Considerationsĭiesel combustion is known to be very lean with A/F ratios of 25:1 at peak torque, 30:1 at rated speed/maximum power conditions, and over 150:1 at idle for turbocharged engines. This paper discusses some aspects related to combustion chamber geometry, in-cylinder flow and compression ratio.
In all combustion systems, these factors must work together to ensure that the combustion process, whether conventional or advanced, achieves the required performance and emissions goals.
This paper discusses some aspects related to combustion chamber geometry, in-cylinder flow and compression ratio.Ĭombustion systems incorporate multiple factors that impact the combustion process. Abstract: Combustion systems incorporate multiple parameters that impact the combustion process.
