Abstract
In this study, engine performance, combustion and emissions a diesel engine used for driving an electrical generator was investigated with LPG fumigation into the manifold of the engine as secondary fuel. Tests were carried out in 4 cylinders, 4 strokes water-cooled and direct-injection diesel engine generator. According to the test results; cylinder pressure, average gas temperature and peak values of heat release rate were increased as amount of LPG was increased. However, brake specific fuel consumption and mass fuel consumption were higher. Generally, with LPG addition, CO and HC emissions were found higher. Up to 40% LPG addition, CO 2 emissions were lowered and over 40% LPG addition, CO 2 emission increased. With increasing LPG ratio, there was a decrease in NOx emission values. On the other hand, generally, as LPG content was increased, O 2 emissions were decreased significantly. Generally, the usage of LPG until certain levels found to be possible as secondary fuel in diesel engines. However, its usage in the engine up to certain levels resulted in considerable negative changes in performance, combustion and emissions changes. Over 55% LPG fumigation resulted in quite high flame velocity and propagation which eventually resulted in the accelerated pressure increase for per crank angle. This condition may be accepted as the starting of the knock. Therefore, only certain low amounts of LPG usage as secondary nonreactive fuel in diesel engine were found to be possible.
Highlights
Petroleum supplies most of the energy needs so as to be used as fuel in the world
Over 55% Liquefied Petroleum Gas (LPG) fumigation resulted in quite high flame velocity and propagation which eventually resulted in the accelerated cylinder pressure for per crank angle
Engine performance, combustion and emissions a diesel engine used for driving an electrical generator was investigated with LPG fumigation into the manifold of the engine as secondary fuel
Summary
Petroleum supplies most of the energy needs so as to be used as fuel in the world. As a result of extreme use of petroleum, the oil reserves are reducing. Due to gradual increase in reserve usage and exhaust emissions, it is forced humanity to face with air pollution and the scarce of the existing energy resources. An attempt has been made to discover the alternative fuels [1,2]. The extreme usage of fuels in the world lead to considerable levels of smoke and particulate emissions to the atmosphere. The increased number of diesel engines has led to alternative fuel searches
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