Swirl Measurements and Modeling in Direct Injection Diesel Engines

880385

02/01/1988

Event
SAE International Congress and Exposition
Authors Abstract
Content
A simple, but useful method is described for predicting the swirl speed during the compression process in a direct injection diesel engine. The method is based on the idea of dividing the combustion chamber into two volumetric regions and computing the variation of the angular momentum in each region.
Laser doppler velocimeter measurements in a motored engine proved the validity of the idea that the volume in the combustion chamber should be treated as two regions, that is, the cylindrical volume inside the piston-cavity radius, and the annular volume outside the piston-cavity radius. Distributions of tangential velocities were measured for different conditions, including the intake port configuration, the piston cavity shape, the compression ratio and the engine speed. These results were integrated in the two regions and provided the measured “two volume-regions” swirl ratio. At the same time, the computation was carried out for the same experimental conditions.
Good agreement between the computed results and the measured results was obtained for the variation of the swirl speed with crank angle during compression, verifying the validity of this model.
Meta TagsDetails
DOI
https://doi.org/10.4271/880385
Pages
24
Citation
Murakami, A., Arai, M., and Hiroyasu, H., "Swirl Measurements and Modeling in Direct Injection Diesel Engines," SAE Technical Paper 880385, 1988, https://doi.org/10.4271/880385.
Additional Details
Publisher
Published
Feb 1, 1988
Product Code
880385
Content Type
Technical Paper
Language
English