Intake valve thermal behavior was observed across a wide range of operating conditions while running an engine on both propane and gasoline. Compared to the gaseous fuel, the liquid fuel operation has cooler valve temperatures (∼50-100C difference) and there is significant temperature gradient across the valve surface due to liquid fuel impinging on the front quadrant of the valve. The valve warm-up time is largely determined by the effective thermal inertia of the valve (∼valve body plus 1/3 of stem mass) and the thermal resistance to the seat. The valve is heated up by the combustion chamber; the dominant cooling paths are through the seat contact and the liquid fuel evaporation. Just after starting, very little fuel evaporates from the cold valve until there is a substantial increase in valve temperature in a period of approximately 10-20 seconds.
Intake Valve Thermal Behavior During Steady-State and Transient Engine Operation
Sae Technical Papers
International Fuels & Lubricants Meeting & Exposition ; 1999
1999-10-25
Conference paper
English
Intake valve thermal behavior during steady-state and transient engine operations
Automotive engineering | 1999
|Steady-State and Transient Operation Simulation of a ``Downsized'' Turbocharged SI Engine
British Library Conference Proceedings | 2007
|Steady-State and Transient Operation Simulation of a “Downsized” Turbocharged SI Engine
SAE Technical Papers | 2007
|British Library Conference Proceedings | 2012
|SAE Technical Papers | 2012
|