Browse Publications Technical Papers 2019-26-0340
2019-01-19

Insight Into Effect of Blow-By Oil Mist Deposits on Turbocharger Performance Deterioration in a Diesel Engine 2019-26-0340

Stringent exhaust gas emission legislation boosts the significance of emission reduction through crankcase ventilation systems in combustion engines. Oil mist separation, which is a part of the Closed Crankcase Ventilation (CCV) systems, directly impacts the emissions of diesel engines. The CCV systems retains the oil with soot & carbon particles and returns them to the oil sump. CCV reduces significant amount of oil entering combustion chamber, thus reduces engine out emission compounds. Contemporary technology enables usage of highly efficient CCV systems. However, filtration efficiency of CCV system is limited to ensure Crankcase pressure is under limits. Oil particles which escape from CCV systems result in soot deposits on turbocharger compressor leading to deterioration of turbocharger performance. Performance variation of Turbo charger has substantial impact on engine emissions. Therefore, it is important to understand effect of CCV system design and different engine operating conditions which accelerate the Oil mist deposits on Turbocharger Compressor. This paper discusses, the impact of oil mist deposits on Turbocharger airflow drop. Effect of CCV filtration efficiencies, age of CCV filter, compressor housing surface temperature, engine airflow and compressor outlet temperature was studied. Various proposals to avoid oil soot formation on compressor housing were explored.

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