Study on the effect of Combustion Chamber Structure on Performance and Emissions of Equivalent Heavy-duty Natural Gas Engines
To study the impact of different combustion chamber designs on the performance of a heavy-duty natural gas engine compatible with China 6 emission standards,a bench test was conducted to analyze the effects of two types of combustion chamber structures,necked-in and bowl-shaped,on engine combustion,performance,and emissions under the same compression ratio.The engine bench test results showed that compared to the necked-in combustion chamber structure,the bowl-shaped combustion chamber structure exhibited faster flame propagation during the initial combustion phase,resulting in a shorter flame development and rapid combustion period,and an earlier combustion phase.However,due to asymmetric flame surface development,the combustion duration was prolonged.Additionally,the improved com-bustion speed reduced the time for the flame to propagate to the end of the mixed gas,thereby widening the detonation boundary.At a low speed of 1100r/min,compared to the necked-in combustion chamber structure,the engine with a bowl-shaped combustion chamber showed a 2.15%reduction in gas consumption rate,a 23%decrease in CH4 emissions,and a 2%drop in turbine inlet temperature.At a high speed of 1700r/min,there was a 2.65%decrease in gas consump-tion rate,a 16%reduction in CH4 emissions,and a 5.8%decline in turbine inlet temperature.
Stoichiometric natural gas engineCombustion chamber structureCombustion characteristicsEngine performance
NETL
NSTL
万方数据
