Evaluation of Spray/Wall Interaction Models under the Conditions Related to Diesel HCCI Engines
Evaluation of Spray/Wall Interaction Models under the Conditions Related to Diesel HCCI Engines
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DOI：
10.4271/2008-01-1632
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发表时间：
2008-06
影响因子：
1
通讯作者：
M. Jia;Z. Peng;M. Xie;R. Stobart
中科院分区：
文献类型：
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作者：
M. Jia;Z. Peng;M. Xie;R. Stobart
柴油机早期喷射均质压燃(HCCI)发动机会产生严重的喷雾/壁面撞击现象，严重影响燃油效率和排放。本文对现有的喷雾/壁面相互作用模型进行了综述，总结了模型的特点，包括喷雾撞击制度、飞溅阈值、二次液滴的质量分数、尺寸和速度。然后在KIVA-3V程序中实现了ORourke和Amsden(OA)模型、BAI和Gosman(BG)模型和han，Xu and Trigui(HXT)模型，并在柴油机均质压燃发动机相关条件下用最新文献中的实验数据进行了验证。通过将喷雾形态、液滴质量、撞击后的大小和速度、壁膜厚度和汽相分布与实验数据进行比较，对三种模型的性能进行了评价。结果表明，考虑气体密度的影响，HXT模型预测的平均液滴直径与实测值吻合较好。然而，喷雾/壁面相互作用模型对壁区附近的油膜厚度和燃油蒸汽分布影响不大，所有模型的预测结果都与实验结果有较大差异。
Diesel homogeneous charge compression ignition (HCCI) engines with early injection can result in significant spray/wall impingement which seriously affects the fuel efficiency and emissions. In this paper, the spray/wall interaction models which are available in the literatures are reviewed, and the characteristics of modeling including spray impingement regime, splash threshold, mass fraction, size and velocity of the second droplets are summarized. Then three well developed spray/wall interaction models, ORourke and Amsden (OA) model, Bai and Gosman (BG) model and Han, Xu and Trigui (HXT) model, are implemented into KIVA-3V code, and validated by the experimental data from recent literatures under the conditions related to diesel HCCI engines. By comparing the spray pattern, droplet mass, size and velocity after the impingement, the thickness of the wall film and vapor distribution with the experimental data, the performance of these three models are evaluated. The results indicated that the predicted mean droplet diameters by HXT model are in better agreements with measurements due to the consideration of the gas density. However, the film thickness and fuel vapor distribution near the wall region are not significantly affected by the spray/wall interaction models, and all the models present inaccurate predictions relative to the experimental results.