Abstract
The measurement of combustion pressure relies on connecting a pressure sensor to a four-stroke marine engine cylinder by a channel led out from the engine cylinder. The geometry of the channel distorts the results of combustion pressure measurements. The purpose of the work is to create a model of combustion processes in engine cylinders. The model uses a mathematical description of the indicator channel on one of the engine cylinders. The input data to the model and the data necessary for its verification came from the direct measurements on the research facility. The test object was a four-stroke Sulzer 3AL25/30 engine loaded by an electric power generator. During calculations, different diameters and lengths of measurement channel were simulated. The obtained results allowed to formulate the conclusion that the geometry of the measurement channel has a significant impact on the measurement results. The increase of the length of the measuring channel as well as the diameter of the channel causes disturbances in the measurement of the maximum pressure.
Highlights
Measurement of combustion pressure is a very important parameter in the diagnosis of marine Diesel engines
The paper presents the results of calculations of the pressure in the indicator channel in a four-stroke marine engine, using CFD
There is a possibility that in the indicator channel pressure accumulation occurs, possibly caused by wave phenomena, which are the effect of compressibility of gases
Summary
Measurement of combustion pressure is a very important parameter in the diagnosis of marine Diesel engines. For measuring the combustion pressure in medium and low speed marine engines, a drainage channel is used from the piston engine cylinder ended with an indicator cock, later called the indicator channel. The main task of the channel is to remove water and impurities from the engine cylinder during initial engine rotation and blowdown. This channel is used to measure the combustion pressure. Such assembly causes the sensor to be removed from the cylinder This assembly reduces the cost of combustion pressure measuring. The Kistler company, which produces piezoelectric pressure sensors, already indicates the problem of combustion pressure measurement, caused by the shape of the channel resulting from the natural frequency of the indicator channel. The combustion pressure was registered in all engine cylinders using Kistler 6613CG1 sensors coupled to a voltage amplifier. Each observation involved 7 revolutions of the crankshaft with a sampling rate of 720 measurements per crankshaft rotation
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