Experimental investigation of the thermal and diluent effects of EGR components on combustion and NOx emissions of a turbocharged natural gas SI engine

•We report the thermal and diluent effects of, EGR gases including CO2 and N2.•Ar was introduced to the test to define the diluent effect of EGR gases.•The thermal effect of CO2 is often larger than the diluent effect on NOx reduction.•The thermal effect of N2 is often less than the diluent effect o...

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