Comparative CFD-Fluent fluid simulation was performed of the inside flow and pressure fields of two types of flame arrester: the flat and corrugated. The results show that the corrugated flame arrester performs better in reducing exhaust backpressure than the flat one and it ensures explosion proof effectiveness. The bench testing of TY4100QFB diesel engine equipped with flat or corrugated flame arresters of equivalent flow area was conducted to analyze the effect of exhaust backpressure on the power

economy and emissions of the engine at full speed and full load. The test results show

on account of large porosity ratio

the corrugated flame arrester has a significant effect on reducing exhaust backpressure

optimizing combustion and reducing NOx

CO and PM

with the average reductions of CO

NOx

PM emissions being 8.5%

4.6% and 11.45% respectively

but output power and fuel consumption have no obvious change. Moreover

the corrugated flame arrester is smaller and lighter.