定容燃焼容器内に模擬した直噴PCCI燃焼におけるNO_x生成に及ぼす混合の影響(熱工学,内燃機関,動力など)

概要

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The effects of fuel injection parameters, such as injection pressure and nozzle hole diameter, on NO_x formation in direct-injection Premixed Charge Compression Ignition (PCCI) combustion were investigated using a constant volume vessel and a total gas-sampling device. The results show that promotion of fuel-air mixing reduces final NO_x mass accompanying delayed hot flame. In this case, the NO_x reduction trend is enhanced by lowering oxygen concentration. Under a fixed nozzle hole size condition, final NO_x mass is reduced with increasing injection pressure, and smaller nozzle hole size promotes this effect. Enhanced mixing and reduced oxygen concentration provide longer mixing periods leading to lower NO_x mass per released heat NO_x/qt, while promotion of mixing hardly affects NO_x/qt when the quantity of injected fuel exceeds a certain level.
社団法人日本機械学会の論文
2006-04-25