Abstract
Gaseous fuels such as natural gas and propane butane mixtures are currently the most popular fuels for dual fuel internal combustion engines. Gaseous fuels are more resistant to knocking than conventional liquid fuels they mix better with air. There have been many published works on the use of gaseous fuels but the problem of the combustion noise, as a very important source of acoustic discomfort is not getting enough attention. Combustion noise occurs in a direct and indirect form. It is transmitted throughout the engine block as a vibration at a different spectrum of frequencies. In this study an attempt has been made to correlate the combustion noise with the operating parameters of an engine fueled with LPG, CNG and CNG-hydrogen mixtures as compared to petrol fueled engine. Signals of multiple resonance in the combustion chamber and corresponding vibration signals of the cylinder block of engine have been considered for one combustion cycle. A four cylinder, 1.6 dm3 spark-ignition engine converted to run on LPG, CNG and CNG-hydrogen mixtures has been tested in the project. A well known diagnostic parameter was used for comparison of the engine noise for its operation on gasoline and alternative fuels. A new non-dimensional indicator has also been proposed for the engine vibration estimation purposes the Increase Wavelet Ratio C’ab, precisely described in the paper.
Highlights
The main goal of the research program connected with the combustion process validation was to design a real time combustion process control system using vibration analysis methods
According to the research that has already been done [1, 2], there is a close correlation between combustion process represented by means of indicated pressure, and engine block vibrations
The variation of those shocks complicates the analysis of the combustion process based on the vibration signals
Summary
The main goal of the research program connected with the combustion process validation was to design a real time combustion process control system using vibration analysis methods. In-cylinder transformation of chemical energy into mechanical energy is a complicated process. Direct indicated pressure measurements are very expensive. According to the research that has already been done [1, 2], there is a close correlation between combustion process represented by means of indicated pressure, and engine block vibrations. Vibration processes that are common for engine operation, constitute a cycle of repeated sequences in time. The following sequence does not match the previous one when the field phenomenon components are taken into account
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