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Intake Valve Thermal Behavior During Steady-State and Transient Engine Operation
Technical Paper
1999-01-3643
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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Citation
Cowart, J. and Cheng, W., "Intake Valve Thermal Behavior During Steady-State and Transient Engine Operation," SAE Technical Paper 1999-01-3643, 1999, https://doi.org/10.4271/1999-01-3643.Also In
References
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