Extending Lean Operating Limit and Reducing Emissions of Methane Spark-Ignited Engines Using a Microwave-Assisted Spark Plug

Table 2

Engine operating conditions.

Compression ratio	10 : 1
Engine speed	1200 RPM
Coolant temperature	75.0±1.00°C
Intake pressure	100.0±0.5 kPa
Intake temperature	28.0±1 °C
Fuel	Methane
Throttle position	100%