The energy for combustion is contained in the hydrocarbon fuel droplet. However, the available fuel is only on the periphery of the droplet. Also, the fuel droplet is a little ball in the bigger air charge volume.
The effectiveness of combustion is dependent on the mating of oxygen molecules to hydrocarbon molecules. The spark flame developed by standard-configuration spark plugs progresses randomly to lower the electric potential between emitter and groun. However when the spark creates a coupled ultrasonic vibration, the flame is collated with spin accoustic pressure. Therefore, the cylinder air/fuel charge is homogenized to enhance combustion. But importantly, the ultrasonic action changes rapidly when accrued flame pressure shatters the fuel droplets. This provides a greater availability of active fuel molecules for combustion. While the total fuel mass is identical in both systems, the ultrasonic flam increases the mass action in the cylinder.
As the ultrasonic flame progresses through the cylinder, it forms a flame front with the non combusted air/fuel. Along the line of the flame front, the vibration intensity of the flame is amplified, and on a fuel droplet, the vibration pressure rapidly changes from a very high pressure, (2000 psi ) to zero, and back strongly increasing the mass action.
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