Abstract
The effects of fuel injection parameters, such as injection pressure and nozzle hole diameter, on NOx 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 NOx mass accompanying delayed hot flame. In this case, the NOx reduction trend is enhanced by lowering oxygen concentration. Under a fixed nozzle hole size condition, final NOx 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 NOx mass per released heat NOx/qt, while promotion of mixing hardly affects NOx/qt when the quantity of injected fuel exceeds a certain level.
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