关键词: 汽车加油管；轻量化；CFD 仿真；液体密封；国六排放标准；波纹管；加油性能

Abstract: A lightweight multi-layer plastic fuel filler pipe is designed which meets China VI regulation. The overall weight of the fuel filler pipe is reduced 28 % by carrying out the lightweight material selection. Based on the existing production line, the extrusion of multi-layer bellows is realized by adding corrugated adsorption mold. Based on ANSYS Fluent, the computational fluid dynamics (CFD) simulation model of the fuel pipe is established, and the fluid flow analysis of the fuel pipe is carry out. The results show that the bellows can slow down the internal fluid flow and facilitate the formation of liquid seal. The refueling test bench is established, and the refueling test and ORVR test of common refueling guns are carried out. The test results show that the performance of the fuel pipe is good, and there will be no splash, reverse spray and early jump gun problems during refueling. The evaporated emission value is 7 mg/day, the refueling emission result is 3.5 mg /L, which meet design requirements.

Key words: Automotive refueling pipes; Lightweight; CFD simulation; Liquid sealing; China VI regulation; Bellows; Refueling performance