Cyclic variation characteristics of dual coal fuels diesel engine under various compression ratios
Dual coal fuels diesel engine with different compression ratios were tested on engine bench,and the cyclic variation characteristics of F-T diesel pilot igniting methanol homogeneous charge engine were investigated under three compression ratios.The result shows that the correlation coefficient of IMEP (pi) and maximum pressure (Pmax) could up to 0.90.The greater compression ratio,the smaller coefficient of variation (CoV) of pi and pmax under 1 200 r/min and the greater CoVPi and CoVPmax under 1 600 r/min and 2 000 r/min.The Pi disperses most and the engine appears knock under medium load,n=2 000 r/min,ε=16.90.Using the discrete time Fourier transform (DTFT) can accurately determine the extent of the engine cyclic variation,the sine wave components in frequency domain could be further studied and to explore the inner influence factors of the signal.
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