发泡条件对基质沥青发泡膨胀率的影响

韩跃杰; 丁智勇; 吴优; 李俊

doi:10.19818/j.cnki.1671-1637.2019.03.003

发泡条件对基质沥青发泡膨胀率的影响

doi: 10.19818/j.cnki.1671-1637.2019.03.003

韩跃杰¹,
丁智勇^2, ,,
吴优²,
李俊²

1.
长安大学特殊地区公路工程教育部重点实验室, 陕西西安 710064
2.
长安大学道路施工技术与装备教育部重点实验室, 陕西西安 710064

基金项目:

国家重点研发计划项目 2016YFC0802208

详细信息

作者简介:
韩跃杰(1978-), 男, 山东潍坊人, 工学博士, 从事道路材料研究

通讯作者:
丁智勇(1977-), 男, 陕西西安人, 长安大学副教授, 工学博士

中图分类号: U414
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- 被引次数: 0
出版历程
- 收稿日期: 2018-12-08
- 刊出日期: 2019-06-25

Influence of foam condition on foam expansion rate of base asphalt

1.
Key Laboratory of Special Region Highway Projects of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Key Laboratory of Road Construction Technology and Equipment of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China

More Information

Author Bio:
HAN Yue-jie (1978-), PhD, 337931500@qq.com

Corresponding author: DING Zhi-yong(1977-), associate professor, PhD, dzy@chd.edu.cn

摘要

摘要: 通过建模软件Solidworks对沥青发生装置进行三维建模, 采用有限元仿真软件Fluent分析了不同参数条件下基质沥青的发泡过程, 并对比了试验结果和仿真结果, 分析了应用有限元仿真技术研究基质沥青发泡膨胀率的可靠性; 对发泡腔和发泡腔内各流体材料进行有限元仿真, 利用Fluent中的后处理功能得到了发泡腔的温度、速度、压力和各相的分布云图。仿真结果表明: 在整个发泡过程中, 基质沥青温度的增大使沥青黏度下降, 发泡腔内水蒸汽增加, 当基质沥青温度从120℃升高到160℃时, 基质沥青的发泡膨胀率从4增大到11, 说明基质沥青温度的变化对其发泡膨胀率的影响很大; 基质沥青流量的增大起到增加发泡腔内基质沥青总量和减少基质沥青之间相互接触时间和接触面积的作用, 当基质沥青入口流量从60 g·s^-1增大到120 g·s^-1时, 基质沥青的发泡膨胀率为7~11, 表明基质沥青流量的变化对其发泡膨胀率的影响很大; 当用水量从2.0%增大到3.5%时, 基质沥青的发泡膨胀率基本不变, 说明用水量对基质沥青发泡膨胀率的影响不大; 仿真得到的最低发泡膨胀率为3.57, 此时发泡条件参数分别是基质沥青流量为120 g·s^-1, 基质沥青温度为120℃, 发泡用水量为3.0%。
- 路面工程 /
- 基质沥青 /
- 发泡腔 /
- 分布云图 /
- 发泡膨胀率 /
- 用水量
Abstract: A 3 D modeling of asphalt generator was carried out by the modeling software Solidworks. The finite element simulation software Fluent was used to simulate the base asphalt foaming processes under different parameters, and the results from the experiment and the simulation were compared. The reliability of finite element simulation technology on the study of base asphalt foam expansion rate was analyzed. The finite element simulation was performed on the foaming cavity and fluid materials inside the foaming cavity. The distributed cloud images of temperature, velocity, pressure, and various phases in the foaming cavity were investigated by using the Fluent post-processing function. Simulation result shows that during the whole foaming process, the increase of base asphalt temperature results in the decrease of asphalt viscosity and the increase of water vapor in the foaming cavity. When the base asphalt temperature rises from 120 to 160 ℃, the foam expansion rate of base asphalt increases from 4 to 11, revealing a great impact of base asphalt temperature on the foam expansion rate. The increase of base asphalt flow rate serves to the increase of total amount of base asphalt in the foaming cavity and reduces the contact time and area between the base asphalts. When the entrance flow rate of base asphalt increases from 60 to 120 g·s^-1, the foam expansion rate of base asphalt fluctuates between 7 and 11, indicating that the change of base asphalt flow rate has a great impact on its foam expansion rate. When the water consumption increases from 2.0% to 3.5%, the foam expansion rate of base asphalt remains the same basically, indicating that the water consumption has little effect on the foam expansion rate of base asphalt. The lowest foam expansion rate obtained by the simulation is 3.57. At this time, the base asphalt flow rate is 120 g·s^-1, the base asphalt temperature is 120 ℃, and the water consumption is 3.0%.
- pavement engineering /
- base asphalt /
- foaming cavity /
- distributed cloud image /
- foam expansion rate /
- water consumption

HTML全文

图 1 基质沥青发泡实体

Figure 1. Base asphalt foaming entity

下载: 全尺寸图片幻灯片

图 2 发泡腔模型

Figure 2. Foaming cavity model

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图 3 发泡腔网格划分

Figure 3. Grid division of foaming cavity

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图 4 网格质量检查

Figure 4. Grid quality inspection

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图 5 基质沥青发泡过程模型

Figure 5. Base asphalt foaming process model

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图 6 基质沥青发泡过程网格划分

Figure 6. Grid division of base asphalt foaming process

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图 7 腔体内部温度分布

Figure 7. Temperature distribution inside cavity

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图 8 腔体内部速度分布

Figure 8. Velocity distribution inside cavity

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图 9 腔体内部的压力分布

Figure 9. Pressure distribution inside cavity

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图 10 腔体内部各相分布

Figure 10. Distributions of each phase inside cavity

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表 1 仿真试验初始参数

Table 1. Initial parameters in simulation experiment

初始参数	气压/MPa	水压/MPa	含水量/%	沥青温度/℃	入口直径/mm	出口直径/mm	喷射时间/s
数值	0.3	0.4	2	160	4	8	5

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表 2 仿真试验中材料参数

Table 2. Material parameters in simulation experiment

材料类型	水	空气	热沥青
温度/K	298.15	298.15	433.15
动力黏度/ (Pa·s)	1.789 4×10^-5	1.003 0×10^-3	0.220 0
密度/ (kg·m^-3)	998.00	3.53	1 050.00

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表 3 基质沥青材料参数

Table 3. Material parameters of base asphalt

参数	密度/ (kg·m^-3)	比热容/[J· (kg·K)^-1]	热导率/[W· (m·K)^-1]
数值	1 050	1 340	0.17

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表 4 基质沥青发泡膨胀率试验数据

Table 4. Experimental data of base asphalt foam expansion rate

基质沥青流量/ (g·s^-1)	80	100	120
发泡膨胀率	7.15	10.23	10.42

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表 5 基质沥青发泡膨胀率仿真结果

Table 5. Simulation data of base asphalt foam expansion rate

基质沥青流量/ (g·s^-1)	80	100	120
发泡膨胀率	6.95	11.14	9.28

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表 6 仿真与试验结果的相对误差

Table 6. Relative errors between simulation and experiment results

基质沥青流量/ (g·s^-1)	仿真发泡膨胀率	试验发泡膨胀率	相对误差/%
80	6.95	7.15	2.8
100	11.14	10.23	8.9
120	9.28	10.42	10.9

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表 9 基质沥青发泡初始条件

Table 9. Initial condition of base asphalt foaming

参数	气压/MPa	基质沥青流量/ (g·s^-1)	基质沥青温度/℃	发泡用水量/%
数值	0.3	60、80、100、120	120、130、140、150、160	2.0、2.5、3.0、3.5

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表 10 基质沥青流量为60 g·s^-1时的发泡膨胀率

Table 10. Foam expansion rates when base asphalt flow rate is 60 g·s^-1

用水量/%	不同基质沥青温度(℃) 下的发泡膨胀率
用水量/%	120	130	140	150	160
2.0	7.17	8.15	9.18	9.21	9.26
2.5	7.17	8.15	9.16	9.21	9.26
3.0	7.17	8.14	9.13	9.20	9.25
3.5	7.17	8.13	9.12	9.20	9.23

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表 11 基质沥青流量为80 g·s^-1时的发泡膨胀率

Table 11. Foam expansion rates when base asphalt flow rate is 80 g·s^-1

用水量/%	不同基质沥青温度(℃) 下的发泡膨胀率
用水量/%	120	130	140	150	160
2.0	5.38	6.12	6.85	8.05	6.95
2.5	5.38	6.12	6.84	8.04	6.95
3.0	5.37	6.11	6.82	8.04	6.93
3.5	5.37	6.11	6.82	8.04	6.93

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表 12 基质沥青流量为100 g·s^-1时的发泡膨胀率

Table 12. Foam expansion rates when base asphalt flow rate is 100 g·s^-1

用水量/%	不同基质沥青温度(℃) 下的发泡膨胀率
用水量/%	120	130	140	150	160
2.0	4.36	6.43	8.22	9.61	11.15
2.5	4.35	6.43	8.22	9.63	11.16
3.0	4.35	6.46	8.21	9.72	11.07
3.5	4.35	6.42	8.21	9.61	11.05

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表 13 基质沥青流量为120 g·s^-1时的发泡膨胀率

Table 13. Foam expansion rates when base asphalt flow rate is 120 g·s^-1

用水量/%	不同基质沥青温度(℃) 下的发泡膨胀率
用水量/%	120	130	140	150	160
2.0	3.59	5.36	6.85	8.14	9.29
2.5	3.58	5.36	6.85	8.13	9.29
3.0	3.57	5.35	6.83	8.12	9.28
3.5	3.57	5.33	6.82	8.12	9.24

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