Blow-by Gases Coalescing Separation: Performances on Passenger Car Engines

2009-01-0869

04/20/2009

Event
SAE World Congress & Exhibition
Authors Abstract
Content
In reciprocating internal combustion engines, the gas that leaks at the piston, rings and liner system is usually called blow-by. The blow-by is a complex mixture of air, burned and unburned gases and oil mist. In order to avoid external pollution, the blow-by is recycled in the air intake system. This is called Closed Crankcase Ventilation (CCV). The CCV is the cause of major issues as air intake system fouling, oil consumption and contribution to the exhaust catalyst poisoning phenomena. During the recent decades a quite simple oil separation system based on baffles was acceptable. Emissions regulations are now tougher and a more efficient blow-by separation system is required.
  • Knowledge of the engine parameters and of the blow-by characteristics, including droplets size distribution, oil mass flow and chemical composition is mandatory.
  • Several separation principles are known, all have advantages and drawbacks. A suitable and efficient means to achieve a good separation is to use the coalescence principle through a specific media.
  • A wide range of media technologies has been evaluated on the test bench. Then selected solutions have been evaluated on the engine test stand. Coalescing separators giving acceptable pressure drop have been tested on the road to verify their behaviour versus real life conditions.
  • The coalescing separation principle is flexible. It allows integration to existing parts and association of functions as the pressure regulation valve.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-0869
Pages
7
Citation
Candy, J., and Guerbe, L., "Blow-by Gases Coalescing Separation: Performances on Passenger Car Engines," SAE Technical Paper 2009-01-0869, 2009, https://doi.org/10.4271/2009-01-0869.
Additional Details
Publisher
Published
Apr 20, 2009
Product Code
2009-01-0869
Content Type
Technical Paper
Language
English