Effect of Exhaust Gas Velocity and Particle Size on Initial Filtration Efficiency and Pressure Drop of Gasoline Particulate Filter
排気ガスの流速と粒径がガソリン車用PMフィルタの初期捕集率と圧損に及ぼす影響
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- Publication code
- 20224468
- Paper/Info type
- JSAE Transaction
Vol.53 No.4
- Pages
- 764-770(Total 7 p)
- Date of publication
- Jul 2022
- Publisher
- JSAE
- Language
- Japanese
Detailed Information
| Category(J) | 研究論文 Translation |
|---|---|
| Category(E) | ResearchPaper |
| Author(J) | 1) 山本 和弘, 2) 青井 智弥 |
| Author(E) | 1) Kazuhiro Yamamoto, 2) Tomoya Aoi |
| Affiliation(J) | 1) 名古屋大学, 2) 名古屋大学 |
| Abstract(J) | ガソリン車用PMフィルタ（GPF）の隔壁構造をX線CTにより取得し，格子ボルツマン法を用いて3次元スス堆積シミュレーションを行った．スス凝集体の粒径と排気ガスの流速を変化させ，流れ場と圧損を調べた．GPFにおいて重要な特性となる初期捕集率を求めるモデルを提案し，粒径と流速に対する依存性を検討した． Translation |
| Abstract(E) | In comparison with port fuel injection (PFI) engines, gasoline direct injection (GDI) engines have higher fuel efficiency. However, there are more particulate matters (PMs) including soot in the exhaust gas. Then, we need gasoline particulate filters (GPFs) with high filtration efficiency for the future stringent PM emission regulations. In this study, we simulated the filtration process on the pore-scale of the filter wall by a lattice Boltzmann method (LBM). The structure of filter wall was obtained by an X-ray CT technique. We discussed pressure drop and initial filtration efficiency, which are important characteristics of GPFs, by changing the inlet velocity of exhaust gas and soot particle size. Results show that, as the soot particle size is smaller, the thicker soot cake layer is formed on the surface of the filter wall, resulting in the smaller pressure drop. The initial filtration efficiency is higher as the particle size is smaller due to the Brownian diffusion. Moreover, when the particle size is larger, the interceptional effect is dominant, and the initial filtration efficiency is higher. As the inlet velocity is smaller, the thicker soot cake is formed on the surface of the filter wall due to the higher filtration efficiency. The pressure drop decreases as the inlet velocity is smaller. |
