等离子体化学效应在激光点火过程中的作用机制与评估

doi:10.7527/S1000-6893.2026.33221

Abstract

Abstract:

Laser ignition technology has received widespread attention in aerospace power systems due to its flexible positioning， high energy density， and fast heat release rate. It mainly relies on the aerodynamic， thermal， and chemical effects of plasma. This article is based on laser ignition experiments conducted in a constant volume combustion chamber of methane/air mixture. The focus is on studying the flame propagation characteristics of single pulse laser-induced ignition， analyzing the influence of laser pulse energy on ignition and flame propagation characteristics， and conducting numerical simulation studies to evaluate the influence of plasma chemical effects. Research has found that the initial flame nucleus exhibits a “three lobed structure”， which is very similar to the vortex ring structure formed by laser-induced air breakdown， verifying the important role of plasma aerodynamic effects in ignition and thermonuclear development. Further comparative analysis was conducted on the development characteristics of ignition flame nuclei with and without chemical effects. The results showed that compared to the aerodynamic and thermal effects of plasma， chemical effects had little effect on the development of flame nuclei.

Key words: laser ignition, plasma, flame propagation, air ionization, chemical effects

CLC Number:

V211

Mu LI, Liguo LIN, Feng GUI, Hong YAN, Fuzhen CHEN, Fan LIU. Mechanism and evaluation of plasma chemical effects in laser ignition process[J]. Acta Aeronautica et Astronautica Sinica, 2026, 47(13): 533221.

Figures/Tables 16

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Table A1

Mechanism of 20 step ionization reaction of 11 components in air

基元反应	A/（cm³·（mol·s）^-1）	b	E_a/（cal·mol^-1）
O₂+I₁⇔2O+I₁	3.61×10¹⁸	-1.00	59 400
N₂+I₂⇔2N+I₂	1.92×10¹⁷	-0.50	113 100
N₂+N⇔2N+N	4.15×10²²	-1.50	113 100
NO+I₃⇔N+O+I₃	3.97×10²⁰	-1.50	75 600
NO+O⇔O₂+N	3.18×10⁹	1.00	19 700
N₂+O⇔NO+N	6.75×10¹³	0	37 500
N+O⇔NO⁺+e^-	9.03×10⁹	0.50	32 400
O+e^-⇔O⁺+e^-+e^-	3.60×10³¹	-2.91	158 000
N+e^-⇔N⁺+e^-+e^-	1.10×10³²	-3.14	169 000
O+O⇔O $2 +$ +e^-	1.60×10¹⁷	-0.98	80 800
O+O $2 +$ ⇔O₂+O⁺	2.92×10¹⁸	-1.11	28 000
N₂+N⁺⇔N+N $2 +$	2.02×10¹¹	0.81	13 000
N+N⇔N $2 +$ +e^-	1.40×10¹³	0	67 800
N₂+O₂⇔NO+NO+e^-	1.38×10²⁰	-1.84	141 000
NO+I₄⇔NO⁺+e^-+I₄	2.20×10¹⁵	-0.35	108 000
O+NO⁺⇔NO+O⁺	3.63×10¹⁵	-0.60	50 800
N₂+O⁺⇔O+N $2 +$	3.40×10¹⁹	-2.00	23 000
N+NO⁺⇔NO+N⁺	1.00×10¹⁹	-0.93	61 000
O₂+NO⁺⇔NO+O $2 +$	1.80×10¹⁵	0.17	33 000
O+NO⁺⇔N⁺+O₂	1.34×10¹³	0.31	77 270

Table A1

Table A2

References 33

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基元反应	A/（cm³·（mol·s）^-1）	b	E_a/（cal·mol^-1）
O+H₂⇔H+OH	0.315 819 6×10⁵	0.252 178 5×10	0.740 817 2×10⁴
O+CH₃⇔H+CH₂O	0.602 333 8×10¹⁴	0.173 711 4	-0.443 896 1×10³
H+O₂+M⇔HO₂+M	0.332 195 6×10¹⁹	-0.792 327 5	-0.451 776 9×10³
H+O₂⇔O+OH	0.293 712 2×10¹⁷	-0.702 733 8	0.168 057 9×10⁵
2H+M₁⇔H₂+M₁	0.114 043 3×10¹⁹	-0.814 723 8	-0.331 032 9×10³
H+ОH+M₂⇔H₂O+M₂	0.247 527 9×10²³	-0.184 024 4×10	-0.393 352 6×10³
H+HO₂⇔O₂+H₂	0.430 739 9×10¹⁴	-0.719 366 5×10^-2	0.106 663 7×10⁴
H+HO₂⇔2OH	0.977 250 9×10¹⁴	0.294 893 0×10^-1	0.556 776 5×10³
H+CH₃（+M₃）⇔CH₄（+M₃）	0.150 890 3×10¹⁷	-0.456 857 8	0.530 308 9×10³
H+CH₄⇔CH₃+H₂	0.652 011 6×10⁹	0.162 138 8×10	0.106 332 4×10⁵
H+HCO⇔H₂+CO	0.652 939 0×10¹⁴	0.761 251 5×10^-1	0.250 207 0×10³
H+CH₂O⇔HCO+H₂	0.503 933 5×10⁸	0.197 388 7×10	0.313 873 1×10⁴
OH+H₂⇔H+H₂O	0.213 300 9×10⁹	0.161 649 8×10	0.346 420 2×10⁴
2OH⇔O+H₂O	0.376 204 8×10⁵	0.228 679 8×10	-0.238 347 0×10⁴
OH+HO₂⇔O₂+H₂O	0.167 710 2×10¹⁴	0.907 382 0×10^-1	-0.553 369 6×10³
OH+CH₄⇔CH₃+H₂O	0.106 393 2×10⁹	0.162 575 5×10	0.298 493 4×10⁴
OH+CO⇔H+CO₂	0.512 983 8×10⁸	0.124 924 7×10	0.704 339 1×10²
OH+CH₂O⇔HCO+H₂O	0.402 114 0×10¹⁰	0.128 922 0×10	-0.504 729 9×10³
HCO+M⇔H+CO+M	0.183 603 9×10¹⁸	-0.869 677 4	0.142 103 7×10⁵

Mechanism and evaluation of plasma chemical effects in laser ignition process

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