Effect of Pilot Injection with Various Starts of Second Injection Command (SOIC2) and Fuel Injection Pressures on Gasoline Compression Ignition Combustion

Table 2

Physical properties of gasoline, biodiesel, and GB20.

Property	Unit	Test method	Gasoline	GB20	Biodiesel
Density at 15°C	kg/m^3	KS M ISO 12185:2003	712.7	757.1	882.3
Lubricity	μm	KS R ISO 12156-1:2012	548	236	189
Cloud point at 15°C	°C	KS M ISO 3015:2008	−57	−16	3
Pour point	°C	ASTM D6749:2002	<−57	<−8	<1
Kinematic viscosity at 40°C	mm^2/s	KS M ISO 3104:2008	0.735	1.4338	4.229
Heating value	MJ/kg	ASTM D240:2009	45.86	43.6	39.79
Surface tension at 20°C	mN/m	ASTM D971:2009	21.56	21.53	31.7
Stoichiometric air-fuel ratio	—	—	14.7	14.276	12.58
Blend ratio	—	—	1.0	0.2	—