|Table of Contents|

Flow field characteristics of catalytic muffler for medium-heavy duty truck(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2015年05期
Page:
65-71
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Flow field characteristics of catalytic muffler for medium-heavy duty truck
Author(s):
XU Xiao-ming JIANG Hao-bin GONG Ran
School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
Keywords:
vehicle engineering catalytic muffler flow field characteristics air inlet uniformity total pressure difference between inlet and outlet air inlet structure
PACS:
U464.134
DOI:
-
Abstract:
Aiming at catalytic mufflers with different air inlet structures and shapes of medium-heavy duty truck, the air inlet uniformity of carrier front face and the total pressure difference between the inlet and outlet were calculated by Fluent software, and the flow field characteristics were analyzed. Calculation result indicates that the flow field characteristics of catalytic muffler are related to engine exhaust. The air inlet uniformity of carrier front face and the total pressure difference between the inlet and outlet are very important for analyzing the flow field characteristics. The air inlet uniformity and the total pressure difference increase after adding baffle, and the flow field characteristics are best after adding erect baffle. The flow field characteristics are good when inlet pipe diameter shrinks by 40 mm and outlet pipe diameter expands by 40 mm. After optimizing catalytic muffler, the air inlet uniformities of carrier front face respectively increase by 1.2% and 1.6%, and the total pressure differences between the inlet and outlet respectively decrease by 57.5% and 63.9% compared to the values before optimization when engine rotation speeds are 900 r·min-1 and 1 900 r·min-1 respectively, which shows that structure optimization significantly decreases the total pressure difference. Compared to barrel shape catalytic muffler, the air inlet uniformity of carrier front face for box shape catalytic muffler increases. Spatial arrangement and utilization efficiency should be considered as well for choosing catalytic muffler. 13 tabs, 16 figs, 20 refs.

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Last Update: 2015-10-20