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Environmentally speaking, simultaneous reduction of smoke and NOx with minimal effects on the fuel economy has been an ideal goal for diesel engine designers. In the past decade several in-cylinder approaches were proposed with various degrees of success in operation. Here, we consider one promissing technique called as double (split) or staged injection. A single-cylinder compression-ignition two-stroke research engine with optically-accessible head, mounted on a high-speed CFR engine crankcase, was used to investigate the combustion and emission characteristics of a dual-injector injection system. The injection system produces two separate independently-controlled sprays with a good degree of adjustability with regard to their fuel quantities and injection timings. Results are presented to show the effects of the varied injection system characteristics on the combustion and exhaust emissions ( NOx and smoke).

In the past decade many in-cylinder approaches were proposed for simultaneous reduction of NOx and smoke with various degrees of success in operation. In this paper, results from a novel and promising technique referred to as Interacting-Sprays injection concept is presented. A single-cylinder compression-ignition two-stroke research engine with optically-accessible head, mounted on a high-speed CFR engine crankcase was used to investigate the combustion and emission characteristics of this injection system. The Interacting-Sprays injection system produces two separate independently-control led sprays with a good degree of adjustability with regard to their fuel quantities and injection timings. The impingement schedule of the two sprays on each other at the right time and place in the combustion chamber is the key to the success of the Interacting-Sprays system.