其浓度随燃烧的进行逐渐下降，并且表现出在急燃期快速降低，缓燃期和后燃期变化较小的趋势。
The trend of the C-H got lower and lower, and it decreased rapidly at the starting of the combustion but slowly afterwards.
结果表明，随着生物柴油体积分数的增加，滞燃期呈现先减小后增大的趋势，但所有混合燃料的滞燃期都低于普通柴油。
The results show that with the increase of the biodiesel concentration, ignition delays of blend fuels decrease at first and then increase, but all the delays are shorter than that of diesel.
传感器检出的信号送入信号处理电路后，经滤波、放大、整形及合成，成为等效于滞燃期的数字脉冲信号。
The signal read out of the sensor is to be filtered, amplified, shaped and synthesized and then transformed into a digital pulse one, which is equivalent to the ignition time delay.
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