Numerical Study of an I4 Engine Oil Ejection During an Accidental Cap-off Running Condition for Two Baffle Designs
2022-01-0472
03/29/2022
- Event
- Content
- Three-dimensional transient numerical simulations are conducted to mimic the operating conditions of a four-cylinder internal combustion engine running without its engine-oil cap on. Navier-Stokes equations are solved together with the multiphase Volume of Fluid (VOF) model and the k-ϵ turbulence model. The engine crank shaft is mechanically connected to two cam shafts through a chain, which operates below the oil-cap open boundary. A baffle is located between the chain and the oil-cap opening to minimize oil spills. The chain geometry and dynamics are captured accurately through volume remesh and conformal mapping techniques. The motion of the four pistons, crank shaft, and two cam shafts is also considered. Retaining all these mechanical and geometrical details in the simulations is essential to obtain accurate oil ejection results. The crank shaft rotates at 1200 RPM and the study is conducted for two different baffle designs. Experimental results indicate a steady-state oil ejection rate of 100 g/h for baffle 1, and 30 g/h for baffle 2. Quick turn-around-time results from numerical simulations yield rates of 108 g/h for baffle 1, and 40 g/h for baffle 2, demonstrating good agreement in magnitude and trend for an application previously considered impractical in Computational Fluid Dynamics while using the VOF method.
- Citation
- Jorda Juanos, A., Schlautman, J., Parsons, N., and Pandey, A., "Numerical Study of an I4 Engine Oil Ejection During an Accidental Cap-off Running Condition for Two Baffle Designs," SAE Technical Paper 2022-01-0472, 2022, .