MMH凝胶液滴蒸发与燃烧过程的数值仿真

doi:10.13229/j.cnki.jdxbgxb.20230049

Abstract

Abstract:

The combustion of monomethylhydrazine （MMH）gel droplet under a nitrogen tetroxide （NTO） environment are simulated considering chemical kinetics. At first， the one-dimensional counterflow and zero-dimensional ignition of the MMH/NTO mixture are conducted. The results show that MMH will decompose into CH₃NNH and H₂ immediately under the current condition， and MMH/NTO mixture has a two-stage ignition. Then， single MMH/NTO droplet combustion under the pressure of 0.5 MPa and temperature of 1 000 K is carried out. The gel formation， expansion and fragmentation， as well as the mutual diffusion of the MMH vapor with NTO and forming a non-premix flame surface are found. Due to the physical process of gel formation， expansion and fragmentation， the temporal evolution of droplet radius is oscillating. Between the sequential gel fragmentation， the temperature at the flame surface will gradually decrease due to the consumption of MMH. With the advance of time， the frequency of gel droplet expansion and break-up increases， leading to a rising in the gas-liquid interface temperature. In addition， it is also found that there are two ignition phenomena for the single MMH gel droplet， and the temperature in the surroundings decreases due to the decomposition of NTO. Finally， the effects of initial temperature and pressure on the combustion process are compared. The higher initial temperature in the surroundings results in the faster the droplet expansion break-up frequency， and the shorter lifetime of the gel droplet. As the pressure increases， the flame surface is closer to the droplet， which is similar to the conventional droplet evaporation combustion process.

Key words: power machinery and engineering, gel droplets, droplet evaporation, droplet combustion, MMH

CLC Number:

V231

Fan ZHANG,Ning HAN,Qing DU,Jing-qi BU,Zhi-jun PENG. Numerical simulation of evaporation and combustion of MMH gel droplets[J].Journal of Jilin University(Engineering and Technology Edition), 2024, 54(11): 3114-3124.

Figures/Tables 13

Fig.1

Table 1

Detailed kinetic mechanism of MMH/NTO［16］"

编号	化学反应	A/（cm³·mol^-1·s^-1）	n	E/（kJ·mol^-1）
1	$M M H + N O 2 → C H 2 N N H 2 + H O N O$	1.96E+28	-3.80	12 840.00
2	$C H 3 N N H 2 + N O 2 → C H 3 N N H + H O N O$	2.20E+11	0.00	6 700.00
3	$C H 3 N N H + N O 2 → C H 2 N 2 + H O N O$	1.00E+08	2.00	0.00
4	$M M H → C H 3 N N H + H 2$	2.20E+11	0.00	6 700.00
5	$H O N O + M → N O + O H + M$	3.26E+13	0.00	18 700.00
6	$N T O + M → N O 2 + N O 2 + M$	8.40E+12	0.00	17 000.00
7	$N O 2 → N O + O$	7.60E+18	-1.27	73 290.00
8	$N O 2 + H → N O + O H$	3.50E+14	0.00	1 500.00
9	$C H 3 N 2 → C H 3 + N 2$	3.00E+06	0.00	0.00
10	$H 2 + O H → H 2 O + H$	2.16E+10	1.51	0.00
11	$C H 3 + O → H + C H 2 O$	8.43E+13	0.00	0.00
12	$C H 2 O + O → O H + H C O$	3.90E+13	0.00	3 540.00
13	$H C O + O → H + C O 2$	3.00E+13	0.00	0.00
14	$C H 3 + N O → H C N + H 2 O$	9.60E+13	0.00	288 000.00
15	$H C N + M → H + C N + M$	1.04E+29	-3.30	126 600.00
16	$C N + H 2 → H C N + H$	2.10E+13	0.00	4 710.00
17	$N H 2 + H → N H + H 2$	4.00E+13	0.00	3 650.00
18	$N H + N O → N 2 + O H$	2.16E+13	-0.23	0.00
19	$H 2 + O → H + O H$	5.06E+04	2.67	6 290.63
20	$H C N + O H → N H 2 + C O$	1.60E+02	2.56	9 000.00

Table 1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Table 2

Fig.11

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环境压力/MPa	环境温度/K	液滴寿命/ms
0.5	1 400	1.702
0.5	1 200	1.781
0.5	1 000	1.866
0.1	1 000	3.623
1.0	1 000	1.349

Numerical simulation of evaporation and combustion of MMH gel droplets

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