Journal of South China University of Technology(Natural Science) >

2025 , Vol. 53 >Issue 4: 81 - 89

DOI: https://doi.org/10.12141/j.issn.1000-565X.240300

Mechanical Engineering

Optimized Design of Foamed Asphalt Spraying Device Considering Viscosity Change and State Change

  • CHENG Haiying ,
  • LI Nanxi ,
  • MA Dengcheng ,
  • WU Wenxia
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  • 1.School of Construction Machinery，Chang’an University，Xi’an 710064，Shaanxi，China
    2.Engineering Research Center of Ministry of Education of Construction and Maintenance Equipment and Technology of Expressway，Xi’an 710064，Shaanxi，China
程海鹰（1973—），女，博士，教授，主要从事筑养路高端装备优化设计研究。E-mail： chy@chd.edu.cn

Received date: 2024-06-11

  Online published: 2024-10-25

Supported by

the National Natural Science Foundation of China(52065051);the Natural Science Basic Research Program of Shaanxi Province(2022JZ-26)

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Abstract

As the key equipment of asphalt pavement regeneration construction, the cold recycling machine can realize cold in-place recycling and improve the construction efficiency. The cold recycling machine faces the issue of asphalt accumulating easily at the nozzle when spraying foamed asphalt, as well as uneven flow rates across the nozzles. To solve the above problems, it is necessary to increase the pressure of foamed asphalt nozzle to reduce asphalt accumulation and balance the flow of each nozzle. This article first started from the essence of asphalt foa-ming behavior, and based on the multiphase flow mixing theory, considered the viscoelasticity of asphalt and phase changes of water during the asphalt foaming process. The viscosity-temperature characteristic function of asphalt and the phase change function of water were introduced into the calculation model to modify the fluid volume (VOF) model and establish a control model for asphalt foaming behavior. Next, numerical simulations were conducted and the results were compared with experimental data. It was found that the errors of the asphalt foaming behavior control model in terms of nozzle pressure and flow rate were 9.2% and 7.7%. Based on the aforementioned asphalt foa-ming behavior model, a numerical simulation model for the foamed asphalt spraying device was then constructed, simulating the foamed asphalt spraying process according to the designed experimental scheme. Based on the simulation results, a Kriging surrogate model was constructed on the Isight platform, and a multi-objective optimization model was established with the goal of improving outlet pressure and reducing the mass flow rate difference of each nozzle. The multi-objective optimization model was solved by the NSGA-Ⅱ algorithm. Finally, a Pareto solution set was obtained and analyzed. The results show that when the asphalt pipe diameter is 0.74a, the foaming water pipe diameter is 0.58b, the foamed asphalt nozzle diameter is 0.6c, and the number of foamed asphalt nozzles is d, the performance of the foamed asphalt spraying device is optimal. By considering the characteristics of asphalt foaming behavior, the performance of the foamed asphalt spraying device is enhanced by adjusting the nozzle pressure and balancing the flow rates across the nozzles.

Key words： foamed asphalt; spraying device; multiphase flow; VOF model; multi-objective optimization

Cite this article

CHENG Haiying , LI Nanxi , MA Dengcheng , WU Wenxia . Optimized Design of Foamed Asphalt Spraying Device Considering Viscosity Change and State Change[J]. Journal of South China University of Technology(Natural Science), 2025 , 53(4) : 81 -89 . DOI: 10.12141/j.issn.1000-565X.240300

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