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Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
2021, 17-20 December, IIT Madras, Chennai, India

Numerical study of combustion and emission performance on a multi-holed gasoline direct injection engine with and without flash boiling spray

Get access DOI: 10.1615/IHMTC-2021.810
pages 539-545

Abstract

In case of SI engines using Gasoline Direct Injection systems, the heat transfer between cylinder head and fuel injector leads to a rise in fuel temperature inside the injector up to 90°C. When such a heated liquid fuel is injected into an environment (when engine runs part-load condition) where the fuel's saturation pressure is higher than the ambient pressure, it will be in a thermodynamically superheated state. Due to this, the fuel will undergo rapid vaporization called flash boiling. Flashing may change the spray behavior, and the spray plumes may merge and collapse for a multi-hole injector. Due to this, the air-fuel distribution inside the cylinder will vary. Thus, it provides a unique challenge to understand the charge distribution and the resultant performance and emissions for a particular GDI engine. The experimental investigations on a GDI engine combustion under the flash boiling conditions are limited. As a result, numerical studies providing insights into such phenomena are highly warranted. This study presents numerical analysis of the combustion and emission performances for GDI systems with and without flashing phenomena. It is expected from this study that by using the flashing model, the spray breakup will change resulting in variations in spray pattern and the performance of the engine.
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