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Abstract
The aim of this research was to investigate the mass, substance and energy flow through two-stroke low speed Diesel engines. For this reason, a zero-dimensional model of the combustion in the engine was developed with a calculated amount and composition of exhaust gases. Due to the large amount of oxygen in the exhaust gases, a ratio of real air consumption and stoichiometric amount of air required for combustion of injected fuel was set. The calculated ratio showed that the engine consumed four times more air than needed for combustion in AFRstoich. In this work, this was called the Air Consumption Factor or Ratio, and has not previously been mentioned in scientific literature. The air consumption ratio is defined as a factor of dry or humid air. To be more comprehensive, a modified diagram of the composition of the flow in and out of a two-stroke fuel injection engine and the cylinder was made.
Highlights
Low speed, two-stroke, turbocharged diesel engines are the most common marine propulsion engines used today
This work developed a 0D model of combustion in a diesel engine. It was applied on a 6S70MC-C7 low speed engine, and by using the NIST program, thermodynamic parameters of air and fuel at the inlet of the engine and parameters of the exhaust gases were obtained
The obtained data show that the composition of exhaust gases did not change significantly in the range of 50 to 100% specified maximum continuous rating (SMCR)
Summary
Two-stroke, turbocharged diesel engines are the most common marine propulsion engines used today. These engines are the most efficient among others, exhibiting 50% efficiency. 50% of the energy released from combustion of fuel is lost to the atmosphere as waste heat. At the beginning of the development of the internal combustion engine, it was recognized that its improvement would be a lengthy and expensive process. Even by the late 1930s, there were established methods to calculate a large number of physical processes in the engine. There were calculation methods developed that enabled the analysis of the influential parameters of the working processes in the engine, and provided data for the development of new and improved engine construction methods
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