Abstract
The Ship uses the MTU 16V956 TB 92 propulsion engine with a piston-type Mexican Hat combustion chamber. In general, the crown is used on machines with large torque. Besides that, the crown shape in the combustion chamber is also very influential on the formation of a mixture of fuel and air before the combustion process occurs. So it is necessary to know about the spray pattern of biodiesel fuel of enviromental things (castor, coconut, used cooking oil/MGB) in the Mexican Hat combustion chamber. In this study, using the Mexican Hat-shaped piston crown simulation method, the first step was to test the spray pattern of the three types of biodiesel (castor, coconut, used cooking oil) by simulating a tube with an injection pressure of 350 bar gauge pressure inside a barometric pressure tube. While the completion in the Mexican Hat combustion chamber with a chamber pressure of 35 bar gauge and injection pressure of 350 bar gauge was completed with the CFD program, Fluent 6.2, and the results of the three biodiesels were compared. From the CFD simulation results obtained spray patterns of the three types of biodiesel (castor, coconut, used cooking oil). At the same injection pressure and chamber pressure, used cooking biodiesel has the longest penetration length, followed by castor biodiesel and coconut biodiesel. The spray angle of coconut biodiesel is the largest, followed by castor biodiesel and used cooking oil biodiesel. SMD coconut biodiesel is the smallest, followed by castor biodiesel and used cooking oil biodiesel.
Highlights
In the Indonesian National Armed Forces environment, the Navy, especially the Republic of Indonesia Navy Ships A, uses a propulsion engine with the MTU type 16V956 TB 92
Visualization on Mexican Hat From the simulation results, a spray image can be obtained as shown in the following Figure: Figure 4 Enviromental Biodiesel Spray at a pressure of Pi= 350 bar pc = 35 bar in a Mexican Hat Combustion Chamber
The spray angle of coconut biodiesel (B100) is greater than that of used cooking oil biodiesel and castor biodiesel. This is because the density of coconut biodiesel is smaller than that of used cooking oil and castor biodiesel
Summary
In the Indonesian National Armed Forces environment, the Navy, especially the Republic of Indonesia Navy Ships A, uses a propulsion engine with the MTU type 16V956 TB 92. The four types of emissions have direct (short-term) effects on humans. While the long-term effects caused by emissions are those that affect the atmosphere. Concentrations, CH4, and NOx in the global atmosphere have increased due to human activities since 1750. Levels in the atmosphere, the main cause is the emission of exhaust gases from combustion in the combustion engine. Fossil fuels will eventually run out because fossil fuels cannot be renewed This has made various groups in the country aware that dependence on fossil fuels needs to be gradually reduced, coupled with the bad effect of burning fossil fuels. On the environment, it is a driving factor in the search and development of alternative energy sources, non-fossil fuels
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