Title: ANALYSIS OF PERFORMANCES OF A DUAL-FUEL TURBOCHARGED COMPRESSION IGNITION ENGINE
Abstract:The paper describes research work on a full-scale dual-fuel 4-cylinder turbocharged compression igni tion engine. Compressed natural gas ( CNG) was applied as the main fuel. Selfignition of the air-fu...The paper describes research work on a full-scale dual-fuel 4-cylinder turbocharged compression igni tion engine. Compressed natural gas ( CNG) was applied as the main fuel. Selfignition of the air-fuel mixture wa s initiated from a diesel oil dose injected by a common r ail system. The re search was aimed to establish maximum C NG share in th e mixture delivered into the cylinder. An excessive CNG share may result in “hard” engine operation. It may also lead to the occurrence of vibrations of piston-crank construction parts resulting in failure o f this mechanism. These vibra tions may originate from knocking combustion (selfignition of the air-fuel mixture in the zone of non-combusted mixture) or vibration excitation as a result of rapid pressure rise after selfignition. Boundary values of the CNG energy share were determined by analysing parameters related to the rate of pressure rise and rate of heat release a s well as the en gine head vibration amplitude represented by the voltage signal generated by the knock sensor. Boundary values of the above mentioned parameters were determined on the basis of measurements done on the engine fuelled in a standard mode. These parameters were registered at operating points corresponding to the maximum power and load. Then, there were done measurements o f basic engine operating parameters at dual fuelling in chosen points of the load characteristic for the engine speed at which the e ngine fuelled in a standard mode had maximum torque. Load characteristics were done for three various diesel oil doses (constant over the whole range of engine load). Load changes were realized by changes of CNG energy share in the fuel charge. Analysis of combustion process parameters and engine head vibrations showed that CNG energy share may reach 60%. Maximum torque is possible to obtain at 45% CNG energy share. 15% decrease of maximum torque was obtained.Read More
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 12
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