Statistical Analysis of Experimental Results on Emission Characteristics of Biodiesel Blended Fuel

바이오디젤 혼합연료의 배기특성 실험결과에 대한 통계학적 해석

Yeom, Jeong Kuk;Yoon, Jeong Hwan

  • Received : 2015.02.23
  • Accepted : 2015.10.05
  • Published : 2015.12.01


In this study, the exhaust gas of a diesel engine operating on biodiesel(BD) fuel(a mixture of diesel and soybean oil) was investigated for different fuel mixing ratios in the range of BD3 to BD100. The experiments were conducted using injection pressures of 400, 600, 800, 1000, and 1200 bar. The Pearson correlation coefficient and Spearman rank-order correlation coefficient were used to quantify the NOx and Soot emissions based on the fuel mixing ratio and injection pressure. Consequently, the Pearson correlation coefficient obtained for NOx and Soot emissions according to the mixing ratio and injection pressure was -0.811 and the corresponding Spearman rank-order correlation coefficient was -0.884, which indicated that the correlation of the NOx and Soot emissions was linear. Thus, the NOx and Soot have a trade-off relationship. Moreover, at each injection pressure, the Pearson correlation coefficient was a negative number, which indicated an inversely proportional relationship between NOx and Soot.


Biodiesel Fuel;Pearson Correlation Coefficient;Spearman Rank-Order Correlation Coefficient;Trade-Off


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