Abstract
The present work investigated the NOSUBx/SUB reduction effect that can be obtained by periodically changing the local equivalence ratio by repeatedly controlling the fuel flow. When there was no pressure pulsation of the fuel, the NOSUBx/SUB emission was 30.3 ppm (O₂ vol.11%), and the NOSUBx/SUB emission was reduced from 4% to 30% according to the pulsation variables. Since it is difficult to directly measure the instantaneous mass and volumetric flow rate during a periodic change on a 103-millisecond scale in an industrial-scale experiment, the measured pressure was used to calculate the mass and volumetric flow rate. The fuel and air supply pressure was fixed at 700 mmH₂O, and when flow pulsation occurred in the fuel pipe, the pressure was changed within the range of 150 to 694 mmH₂O. As a result of calculation through the one-dimensional model, it had a local equivalence ratio range of 0.108 to 0.776. In the chemical equilibrium domain of methane, the relationship between the local equivalence ratio change and combustion products according to the operating characteristics of the fuel-flow pulsation valve was discussed.
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