Here you will find geometrical and boundary condition data for the small-bore, swirl-supported diesel research engine. The cylinder head is from a GM 1.9L, light-duty diesel engine. Two piston geometries are available, as are valve lift curves and flow coefficients. Spray targeting is defined for two different sets of experiments.
CFD geometry files
Conventional piston bowl, flat top
Conventional piston bowl, flat top, cleaner version of closed portion of cylinder:
Conventional piston bowl, with valve cutouts
Conventional piston bowl, with valve cutouts, cleaner version of closed portion of cylinder:
Stepped-lip piston bowl, flat top
Valve Lift and Flow
Spray targeting is changed based on the study. Validation data are available for two studies. Note that tip penetration and nozzle hole position are not the same! For the bowl geometry study, the vertical distance between the nozzle holes and the fire deck are as follows:
- Conventional bowl: 1.06 mm
- Stepped-lip bowl: 1.35 mm
For the pilot-main dwell study, the vertical distance between the nozzle holes and the fire deck is 0.41 mm.
These two files provide additional spray targeting information.
Descriptions of the geometry can be found in the following sources:
Perini, K. Zha, S. Busch, E. Kurtz, R. Peterson, A. Warey, R.D. Reitz, “Piston geometry effects in a light-duty, swirl-supported diesel engine: flow structure characterization”, Int J Engine Res, under review, 2016;
Perini, P.C. Miles, R.D. Reitz, “A comprehensive modeling study of in-cylinder fluid flows in a high-swirl, light-duty optical diesel engine”, Computers & Fluids 2014(105):113-124, doi:10.1016/j.compfluid.2014.09.011.
Perini, K. Zha, S. Busch, P.C. Miles, R.D. Reitz, “Principal Component Analysis and study of port-induced swirl structures in a light-duty optical diesel engine”, SAE Technical Paper 2015-01-1696, SAE 2015 World Congress and Exhibition, Detroit, MI, Apr 21-23, 2015.
Some of our experiences with simulation approaches and the the flows/spray-wall interactions in this engine. We’ve able to achieve qualitative agreement with optical combustion image velocimetry data only with a full engine mesh.
Perini, F., Busch, S., Kurtz, E., Warey, A., Peterson, R. C. and Reitz, R., “Limitations of Sector Mesh Geometry and Initial Conditions to Model Flow and Mixture Formation in Direct-Injection Diesel Engines.” SAE Technical Paper 2019-01-0204, 2019, DOI: https://doi.org/10.4271/2019-01-0204.