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

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

Abstract

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

CLC Number:

U414

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 Edition), 2025, 53(4): 81-89.

Figures/Tables 12

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计算域	所属边界	边界类型
热沥青入口计算域	热沥青入口边界	速度进口
热沥青入口计算域	热沥青流动壁面边界	壁面
发泡水入口计算域	发泡水入口边界	速度进口
发泡水入口计算域	发泡水流动壁面边界	壁面
泡沫沥青喷口计算域	泡沫沥青喷口边界	压力喷口
泡沫沥青喷口计算域	泡沫沥青喷口壁面边界	壁面
发泡腔内部表面计算域	发泡腔体壁面边界	壁面

单元尺寸/mm	网格数量/10⁵个	单元质量	偏斜系数	正交质量系数	喷口压力/Pa	质量流量/（kg·s^-1）
2.0	2.55	0.822	0.245	0.753	38 780.63	0.120 3
2.5	1.37	0.820	0.247	0.751	39 398.35	0.120 5
3.0	0.84	0.819	0.250	0.748	39 191.56	0.120 4

试验方案	泡沫沥青喷口个数	M₁/（kg·s^-1）	M₂/（kg·s^-1）	M₃/（kg·s^-1）
1	0.88d	0.122 558 821	0.120 435 880	0.112 477 307
2	0.31d	0.343 192 017	0.341 421 768	0.299 314 318
3	0.31d	0.337 445 941	0.331 903 514	0.321 705 200
4	0.88d	0.220 253 660	0.215 547 760	0.208 703 654
5	0.31d	0.341 384 683	0.339 985 845	0.315 814 858
6	0.88d	0.124 912 350	0.118 824 900	0.111 536 547
7	0.88d	0.122 410 910	0.121 365 442	0.117 296 458
8	0.31d	0.340 132 236	0.325 589 383	0.321 640 512
9	0.56d	0.190 729 438	0.189 251 290	0.178 109 889
10	0.56d	0.188 636 534	0.187 553 671	0.179 844 318
11	0.56d	0.192 089 861	0.185 681 959	0.180 591 853
12	0.56d	0.185 877 964	0.183 186 318	0.181 590 669
13	0.56d	0.192 089 861	0.185 681 959	0.180 591 853
14	0.56d	0.195 039 795	0.183 004 009	0.177 252 217
15	0.13d	0.107 798 784	0.104 634 938	0.103 436 888
16	0.56d	0.188 167 531	0.183 124 272	0.182 956 925

序号	x₁	x₂	x₃	x₄	p/Pa	Q₁/%	Q₂/%	Q₃/%
1	0.91a	0.75b	0.9c	0.88d	2 331	1.73	6.61	8.23
2	0.91a	0.75b	0.5c	0.31d	826 393	0.52	12.33	12.79
3	0.91a	0.58b	0.9c	0.31d	41 315	1.64	3.07	4.66
4	0.91a	0.58b	0.5c	0.88d	189 186	2.14	3.18	5.24
5	0.63a	0.75b	0.9c	0.31d	43 397	0.41	7.11	7.49
6	0.63a	0.75b	0.5c	0.88d	102 740	4.87	6.13	10.71
7	0.63a	0.58b	0.9c	0.88d	5 464	0.85	3.35	4.18
8	0.63a	0.58b	0.5c	0.31d	863 309	4.28	1.21	5.44
9	a	0.75b	0.7c	0.56d	39 029	0.77	5.89	6.62
10	0.55a	0.75b	0.7c	0.56d	33 225	0.57	4.11	4.66
11	0.77a	b	0.7c	0.56d	39 986	3.34	2.74	5.99
12	0.77a	0.5b	0.7c	0.56d	38 413	1.45	0.87	2.31
13	0.77a	0.75b	c	0.56d	8 207	3.34	2.74	5.99
14	0.77a	0.75b	0.4c	0.56d	680 594	6.17	3.14	9.12
15	0.77a	0.75b	0.7c	d	12 585	2.93	1.14	4.05
16	0.77a	0.75b	0.7c	0.56d	38 734	2.68	0.09	2.77

序号	沥青管径/mm	发泡水管径/mm	泡沫沥青喷口直径/mm	泡沫沥青喷口个数	p/Pa	Q₁/%	Q₂/%	Q₃/%
1	0.74a	0.58b	0.6c	d	47 240	3.77	0.97	2.85
2	0.74a	0.42b	0.5c	0.94d	63 630	4.00	1.73	3.87
3	0.76a	0.42b	0.5c	0.94d	36 570	3.83	2.40	4.50
4	0.76a	0.42b	0.5c	0.94d	53 480	4.10	2.50	4.70