Atomization Characteristics Analysis and Structure Optimization of an Aviation Fuel Nozzle

doi:10.16183/j.cnki.jsjtu.2021.256

Abstract

Abstract:

Fuel atomization plays an important role in premixed combustion of aero-engine. In order to improve the atomization characteristics of an aviation fuel nozzle and optimize its structural parameters, the volume of fluid (VOF) interface capture algorithm and orthogonal experimental design were used to study the influence of internal flow and structural parameters (expansion angle, length of straight section, rise angle of swirl groove, and number of swirl groove) on the atomization characteristics. The results show that the local vortex on the swirl groove affects the fuel flow in the nozzle, and the local pressure loss can be eliminated by changing the structure of the swirl groove inlet. The number of swirl grooves has the most significant effect on Sauter mean diameter (SMD), the expansion angle is the biggest factor affecting the atomization cone angle, there is an optimal swirl groove elevation angle to minimize the oil film thickness, and the length of straight section has relatively little effect on the atomization characteristics. When the expansion angle is 60°, the length of straight section is 0.25 mm, the rising angle of swirl groove is 45°, the number of swirl grooves is 2, and the optimization effect is the best. After optimization, the oil film thickness decreases by 43.68%, the atomization cone angle increases by 3.70%, and the SMD decreases by 14.79%.

Key words: aviation fuel nozzle, atomization characteristics, volume of fluid (VOF), orthogonal experiment, Sauter mean diameter (SMD), structure optimization

CLC Number:

TH122

BAI Qingsong, WU Yang, HOU Li. Atomization Characteristics Analysis and Structure Optimization of an Aviation Fuel Nozzle[J]. Journal of Shanghai Jiao Tong University, 2023, 57(1): 84-92.

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网格数量	θ/(°)	q_m/(g·min^-1)
97万	65.13	67.24
131万	65.62	67.75

水平	因素
水平	A/(°)	B/mm	C/(°)	D
1	30	0.75	40	2
2	45	0.50	45	3
3	60	0.25	50	4

试验	参数组合	评价指标
试验	参数组合	δ/μm	θ/(°)	SMD/μm
1	A₁B₁C₁D₁	108	51.23	34.256
2	A₁B₂C₂D₂	89	54.36	32.641
3	A₁B₃C₃D₃	123	57.25	36.229
4	A₂B₁C₂D₃	112	63.65	35.727
5	A₂B₂C₃D₁	81	55.34	31.837
6	A₂B₃C₁D₂	106	67.11	35.369
7	A₃B₁C₃D₂	89	65.56	33.506
8	A₃B₁C₁D₃	128	77.24	37.882
9	A₃B₃C₂D₁	49	68.36	28.379

分析参数	A	B	C	D
K₁₁	107.67	103	114	79.33
K₁₂	99.67	99.33	83.33	94.67
K₁₃	88.67	92.67	97.67	121.00
R₁	19.00	10.33	30.67	41.67
最优水平	A₃	B₃	C₂	D₁
主次顺序	D>C>A>B

分析参数	A	B	C	D
K₂₁	54.28	60.15	65.19	58.31
K₂₂	62.03	62.31	62.12	62.34
K₂₃	70.39	64.24	59.38	66.05
R₂	16.11	4.09	5.81	7.74
最优水平	A₃	B₃	C₁	D₃
主次顺序	A>D>C>B