| Abstrakt: |
Purpose: The current study focuses on measuring the level of vibration and noise produced by a direct injection diesel engine when running on a mixture of molybdenum trioxide (MoO3) nanoparticles and Calophyllum inophyllum biodiesel (B20). Methods: The nanoparticles were used in an amount of 75 ppm and mixed with a surfactant and dispersant. In addition, the prepared fuel samples were tested on a diesel engine to investigate the vibration and noise characteristics by changing the injection pressures to 200 bar, 220 bar and 240 bar. Results and conclusion: The addition of nanoparticles to B20 has significantly reduced vibration and noise, especially when using nanofuel enriched with dispersants. In addition, the increased pressure during fuel injection resulted in reduced vibration and noise levels. Using B20 + MoO3 75 ppm + Dispersant 75 ppm fuel blend gave the most favourable results regarding RMS velocity and noise levels compared to the base diesel fuel. The progressive reduction in vibration and noise levels was seen as a result of the increased injection pressure. At a pressure of 240 bar, the B20 + MoO3 75 ppm + dispersant 75 ppm has shown a lower vibration and noise intensity than diesel and other fuel samples. The RMS velocity of RMS noise of B20 + MoO3 75 ppm + dispersant 75 ppm are 0.591 m/s, 0.568 m/s, and 0.491 m/s at 200 bar, 220 bar and 240 bar while the RMS noise is 68.266 dB (A), 66.283 dB (A), and 65.857 dB (A) respectively. The most decrease in vibration and noise was 28.76% and 9.78%, respectively compared to regular diesel for B20 + MoO3 75 ppm + dispersant 75 ppm at 240 bar. Finally, the kurtosis and skewness of the vibration data are within the normal range, which indicates that the distribution corresponds to the ideal normal distribution. [ABSTRACT FROM AUTHOR] |
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