Abstract
Fuels have important effects on the quality parameters of engines such as noise pollution and vibration. Diesel fuel are used in wide range of applications especially in compression ignition engines. The objective of the present research is evaluation of the noise emitted from a single-cylinder diesel engine using magnetized biodiesel-diesel fuel blends. In general, samples were provided with different percentages of the biodiesel-diesel blends as diesel (100, 95, 90, and 80%) and biodiesel (0, 5, 10, and 20%) by applying magnetic field (0, 5300 and 7000 G) to fuel line known as DxByMz. The measurements were done on a power tiller engine at a 10 cm distance from driver ear with three replications. The statistical approach in time domain and signal processing in frequency domain were applied for data analysis. The results of the variance analysis approved significant differences between the studied fuel blends and magnetic levels at 1% probability level. The highest and lowest average value of sound pressure level was corresponded to D100B0M0 and D80B20M5300, respectively. The results in frequency domain showed that the maximum sound pressure level values were in the frequency range of 31.5–200 Hz for all fuel blends and magnetic levels. The frequencies related to the maximum sound values varied by changing biodiesel percent and magnetic level.
Highlights
The role of self-propelled machines equipped by diesel engine significantly increased during the recent decades in different countries (Karthikeyan et al, 2020a)
In the present research after data acquisition and analysis there was specified that both main factors, biodiesel fuel and magnetic field intensity, and the interaction between those, had significant effect on the sound pressure level of the studied power tiller in the present research at 1% probability level
The maximum sound level was corresponded to pure diesel (B0) with average value of 80.80 dB without using magnetic field (M0) that can be due to combustion knock and the minimum sound pressure level (SPL) value was belonged to B20 and B10 with magnetic field intensity of 5300 G (M5300) and B10 with magnetic field intensity of 7000 G (M7000) as 75.59, 76.29, and 76.25 dB, respectively
Summary
The role of self-propelled machines equipped by diesel engine significantly increased during the recent decades in different countries (Karthikeyan et al, 2020a). Due to the development of the electronics industry and its application in engine, diesel engines are used in self-propelled machines more than before. There are two issues in this aspect, reduction of fossil fuel resources and environmental pollutions that causes to change the climate (Mirzajanzadeh et al, 2015; Karthikeyan et al, 2020b). The decrease of fossil fuel sources and increase of the prices of fossil fuels in the world caused to use of renewable energy sources in diesel engines as an alternative fuels. Environmental pollution emitted by ignition of fossil fuels more emphasized on the use of renewable energies (Zoldy, 2011; Ghobadian et al, 2009; Khoobbakht et al, 2019)
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