Abstract
The purpose of this study is to realize high-efficient dual fuel combustion with natural gas and diesel fuel. Diesel fuel was injected directly into combustion chamber of a single cylinder diesel engine. And diesel fuel was injected through micro-hole nozzle with a common rail system. The natural gas was injected at an intake port as premixed gas. In order to distribute diesel fuel spray in combustion chamber, one diesel injection event was split into twice ones, where diesel fuel was injected earlier than usual and around TDC. In this study exhaust emissions and heat release characteristics were investigated. The result show that a timing and an amount of 1^<st> injection significantly influence on unburned emissions and thermal efficiency. And it seems that precise control of diesel fuel distribution has a great importance to combustion performance of natural gas with diesel fuel.
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