沥青发泡腔内多相流场解析与试验的对比评价

Comparative Evaluation for Analysis and Experiment of Multiphase Flow Field in Asphalt Foaming Chamber

为制定沥青发泡腔结构设计的评价机制,提出了基于沥青发泡腔内多相流场解析与试验的对比评价方法,即建立沥青发泡过程动力学模型,以解析不同发泡腔结构下的多相流场分布.通过解析结果与试验数据的对比,验证了上述模型的有效性;进而建立发泡腔结构设计的评价指标,与试验数据进行对比分析后,得到了沥青发泡腔结构设计的评价机制,且在一定程度上揭示了沥青发泡机理,即发泡腔内沥青与水的混合均匀度越差、温度波动越大、水蒸气越少,则沥青发泡效果越好,发泡腔结构设计越合理.

To establish evaluation mechanism for structural design of asphalt foaming chamber, compara-tive evaluation method for analysis and experiment of multiphase flow field in asphalt foaming chamber was proposed. Modeling the＇asphalt foaming process, analyzing multiphase flow field distribution in different foaming chambers, comparing analytical results with experimental data, validity of the model was verified. Evaluation index of foaming chamber was built and compared with the experimental data. Evaluation mechanism for structural design of asphalt foaming chamber was obtained and to a certain extent mechanism of asphalt foaming was revealed. It is concluded that uniformity between asphalt and water is smaller and temperature fluctuation is bigger and water vapor is less, structural design of asphalt foaming chamber and foaming result is better. The method is valuable for structural design of foaming chamber and engi- neering applications of foamed asphalt.