Abstract
The main purpose of this study is to observe the effects of compression ratio (CR) on the performance and emission characteristics of a single-cylinder diesel engine operating with fuels obtained by adding methanol and Al2O3 nanoparticles to diesel fuel. For this purpose, Diesel RK software was used and a simulation model was created. The simulation model created was verified with the previous experimental study and a maximum error of 6.5% was obtained. After the model was validated, analyses were performed at different compression ratios as 16.5, 17.5 and 18.5. Analyses were carried out at 1500 rpm constant engine speed and full load. In the results, it was observed that the brake specific fuel consumption (BSFC) and NOx values increased as the compression ratio increased for all test fuels. The minimum BSFC value was obtained in diesel fuel as 219 g/kWh at a compression ratio of 16.5. The minimum NOx value was obtained in M15A100 (test fuel obtained by adding 100 ppm Aluminium oxide nanoparticles to the test fuel called M15, which consists of 15% methanol, 85% diesel fuel by volume) fuel as 651 ppm at a compression ratio of 16.5.
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