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A model of fuel combustion process in the marine reciprocating engine work space taking into account load and wear of crankshaft-piston assembly and the theory of semi-Markov processes

Girtler J.

Polish Maritime Research

2016

nr 3

50--57

The article analyses the operation of reciprocal internal combustion engines, with marine engines used as an example. The analysis takes into account types of energy conversion in the work spaces (cylinders) of these engines, loads of their crankshaft-piston assemblies, and types of fuel combustion which can take place in these spaces during engine operation. It is highlighted that the analysed time-dependent loads of marine internal combustion engine crankshaftpiston assemblies are random processes. It is also indicated that the wear of elements of those assemblies resulting from their load should also be considered a random process. A hypothesis is formulated which explains random nature of load and the absence of the theoretically expected detonation combustion in engines supplied with such fuels as Diesel Oil, Marine Diesel Oil, and Heavy Fuel Oil. A model is proposed for fuel combustion in an arbitrary work space of a marine Diesel engine, which has the form of a stochastic four-state process, discrete in states and continuous in time. The model is based on the theory of semi-Markov processes.

Valuation method for operation of cranshaft-piston assembly in combustion enginesin energy approach

Girtler J.

Journal of Polish CIMAC

2011

Vol. 6, no 1

89-98

The paper presents a proposal for evaluation (quantification) of operation of any crankshaft-piston assembly in a diesel engine, in which energy interactions proceed at a defined time. This operation is understood as energy transfer to a receiver at a fixed time during which the energy is converted and transferred in the forms of work and heat. Valuation of operation of crankshaft-piston assemblies in diesel engines, as proposed by the author of this paper, consists in equating the operation of this type of engines to a physical quantity whose the unit of measurement is the joule second [joule„esecond]. The crankshaft-piston assembly operation leading to execution of a power stroke by piston has been presented with regard to that the piston connected to the engine crankshaft through a connecting rod moves flat.