正戊醇/汽油层流扩散火焰碳烟生成动力学

Two-dimensional soot concentration distribution in the n-pentanol/gasoline laminar diffusion flames were measured by TC-LII technique. The effect of n-pentanol blending ratio on soot formation was investigated. The semidetailed pentanol-TRF-PAH mechanism was constructed, and the pathways and sensitivity of soot precursors were analyzed with CHEMKIN 0-D constant pressure reactor. The results show that the n-pentanol addition can significantly inhibit the soot formation. The soot concentration decrease linearly with the increasing of n-pentanol ratio. Compared with pure gasoline, the peak soot of P20, P40, P60 and P80 decreases by 21.4%,, 45.3%,, 64.9%, and 84.5%, respectively. The kinetic analysis shows that the mole fraction of A1-A4 decreases with the increasing of n-pentanol content. The n-pentanol addition does not change the main production and consumption pathways of A1. For the P100, A1 is generated by the reactions of C ₃ +C ₃ and C ₄ +C ₂ , and the rate of Al formation is much smaller than that of toluene containing fuel(P0-P80). The reduction of soot by n-pentanol addition is mainly due to the dilution effect of aromatics. In addition, the A1 formation process was controlled by the chemical reaction processes of HO ₂ , OH, CH ₃ and H. The sensitivity of desensitization of H ₂ O ₂ and HO ₂ is enhanced.