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Experimental study on the boiling criterion of the fuel film formed from spray/wall impingement

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Abstract

The vaporization of the fuel film after spray/wall impingement dramatically affects the combustion and emission behaviors in engines. In this study, the formation and vaporization characteristics of the fuel film were investigated by injecting diesel fuel from a single-hole injector onto a high-temperature, rough wall. The film thickness was measured using the refractive index matching (RIM) technique. The influence of fuel injection duration, injection pressure, and wall temperature on the film vaporization process was discussed based on the measurements. The results indicated that when the wall temperature reached a critical value, the nucleate boiling of the fuel film appeared. The boiling intensity dramatically increased and the boiling duration decreased with the increasing wall temperature. It was also found that the boiling phenomenon of the wall film was closely associated with the thickness of the residual fuel film on the wall and the film temperature, while it was nearly independent on the fuel injection conditions. Based on the theoretical analysis, it was revealed that there was a critical bubble radius for the bubble nuclei growing in a certain thickness of the fuel film within a conical pit.

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Abbreviations

h :

Film thickness

h cri :

Critical film thickness for boiling

h fg :

Latent heat of vaporization of liquid

I :

Intensity of the scattered light

p inj :

Rail pressure

P l :

Pressure within the liquid film

P v :

Vapor pressure of liquid

R :

Radius of bubble within film

R c :

Critical bubble radius of liquid boiling

t inj :

Injection duration

T boil :

Boiling point of liquid

T film :

Liquid film temperature

T l :

Liquid temperature

T s :

Liquid saturation temperature

T w :

Wall temperature

x, y :

Horizontal, vertical directions

β :

Cone angles of groove

δ l :

Liquid depth in pit

θ film :

Dimensionless film temperature

σ :

Surface tension of liquid

cri:

Critical

film:

Film

inj:

Injection

ref:

Reference

W:

Wall

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Acknowledgements

The work was financially supported by the National Natural Science Foundation of China (Grant Nos. 91641117 and 51961135105) and Key Laboratory of High Efficiency and Low Emission Engine Technology, Ministry of Industry and Information Technology, Beijing Institute of Technology. Dr. Yanzhi Zhang also thanks the financial support from Natural Science Foundation of Jiangsu Province, China (Grant No. SBK2019040799).

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Authors and Affiliations

  1. Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Hong Liu, Jianxiang Wang, Huiquan Duan, Chang Cai & Ming Jia

  2. Institute for Energy Research, Key Laboratory of Zhenjiang, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    Yanzhi Zhang

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  1. Hong Liu
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  2. Jianxiang Wang
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  3. Huiquan Duan
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  4. Chang Cai
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  5. Ming Jia
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  6. Yanzhi Zhang
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Correspondence to Ming Jia.

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Liu, H., Wang, J., Duan, H. et al. Experimental study on the boiling criterion of the fuel film formed from spray/wall impingement. Exp Fluids 60, 179 (2019). https://doi.org/10.1007/s00348-019-2829-8

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  • DOI: https://doi.org/10.1007/s00348-019-2829-8

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