Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (12): 3314-3325.doi: 10.13229/j.cnki.jdxbgxb.20221346

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Simulation analysis of influencing factors of flash boiling spray collapse of porous injector

Fang-xi XIE1(),Shi-jie ZHAO1,Zi-sen WANG1,Shuang LIU2,Xiao-ping LI1(),Cheng ZHANG3   

  1. 1.College of Automotive Engineering,Jilin University,Changchun 130022,China
    2.FAW-Volkswagen Automotive Co. ,Ltd. ,Changchun 130011,China
    3.China FAW Group R&D Institute Co,Ltd. Powertrain Development Department of New Energy Development Institute,Changchun 130013
  • Received:2022-10-21 Online:2023-12-01 Published:2024-01-12
  • Contact: Xiao-ping LI E-mail:xiefx2011@jlu.edu.cn;lixp2008@jlu.edu.cn

Abstract:

The Converge was used to study the spray characteristics of porous injectors under different fuel temperature conditions, and the influence on the spray collapse degree was studied by changing the number of nozzles, ambient pressure and temperature, oil beam injection direction and radial spacing of adjacent nozzles. The results show that with the increase of fuel temperature, the degree of flashing phenomenon is more violent, the spray cone angle and spray width increase, the spray center is difficult to exchange with the external gas, so that the low pressure condition of the spray center is difficult to improve, and the oil beam gathers to the middle under the action of pressure difference, and finally evolves into spray collapse. By changing the ambient pressure and temperature, it can be found that after appropriately increasing the environmental pressure, the spray collapse phenomenon will become violent, and increasing the ambient temperature has no obvious effect on the degree of spray collapse; Changing the oil beam spacing by changing the number of nozzle holes, the direction of the oil beam and the radial spacing of the spray holes has a significant effect on the degree of spray collapse.

Key words: spray characteristics, flash boiling, spray collapse, numerical simulation

CLC Number: 

  • TK411

Fig.1

Spray G injector"

Fig.2

Injector angle setting"

Table 1

Eight-hole injector parameters"

参数数值及说明参数数值及说明
燃料异辛烷喷孔直径(测量)/mm0.175
环境气体纯氮喷孔长度/mm0.16~0.18
喷油器类型德尔福电磁阀启动阶梯孔直径(设定)/mm0.388
喷孔类型阀盖孔板(VCO)阶梯孔直径(测量)/mm0.400
喷孔数8(平均分布)喷孔方向(与轴线夹角)/(°)37
喷孔形状阶梯式全外喷角/(°)80
喷孔直径(设定)/mm0.165

Table 2

Spray G experimental data"

参数数值参数数值
喷射压力/105 Pa200喷射质量/mg10
燃料温度/K293 363喷射脉宽/ms0.78
环境温度/K293 333氮气体积分数/%100
环境压力/105 Pa0.5氧气体积分数/%0

Fig.3

Constant volume bomb model"

Table 3

Selection of calculation models"

模型类别选用模型名称
气态状态方程Redlich-Kwong
求解器PISO(基于密度)
分布类型均匀分布
湍流扩散模型O’Rourke
碰撞模型NTC
碰壁模型Wall Film
破碎模型KH-RT(KH-ACT修正)
湍流模型RNG k-ε
蒸发模型Frossling(闪沸工况Flash modeling模型)

Fig.4

Test for grid independence and mesh encryption situation"

Fig.5

Comparison of experimental and simulation images of transitional flash boiling spray"

Fig.6

Simulation and experimental comparison of cold spray penetration distance"

Fig.7

Simulation and experimental comparison of transitional Flash boiling spray penetration distance"

Fig.8

Distribution of different number of spray holes"

Fig.9

Simulation of injector spray at different fuel temperatures"

Fig.10

Gas phase mass fraction cloud at different fuel temperatures"

Fig.11

Plot of gas phase mass fraction at different fuel temperatures"

Fig.12

Velocity vector nephogram of spray at different fuel temperatures"

Fig.13

Cloud map of constant volume bomb pressure distribution at different fuel temperatures"

Fig.14

Comparison of porous spray collapse under different environmental pressures"

Fig.15

Comparison of severe flash boiling spray at different ambient temperatures"

Fig.16

Schematic diagram of spray spacing between different nozzle numbers of severe flash boiling"

Fig.17

Simulation of spray diagram of severe flash boiling under different spray angles"

Fig.18

Spray at 30° and 37° oil beam angles runs through the distance 2D"

Fig.19

Simulation of spray diagram of severe flashing under different radial nozzle distances"

Fig.20

Mass fraction of severe flash boiling spray vapor phase at different radial orifice spacing"

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