A Complex Evaluation and Optimization Approach for Oxygen-Enriched Combustion Characteristics of Blended Fuels Based on Response Surface Methodology

Table 10

The variance of combustibility index using different models.

Source of variance	Quadratic sum	Degree of freedom	Mean square	F-value	Probability > F	Scheme selection
Quadratic sum	15973.686	1	15973.686
Linear model	1298.897	3	432.9657	6.3769	0.0059
2FI	368.196	3	122.732	2.4367	0.1213
Quadratic equation	356.962	3	118.9873	8.896	0.0078	Recommended
Cubic equation	96.981	3	32.327	137.234	0.0002	Poor
Residual deflection	0.924	4	0.231
Grand total	18095.65	17	1064.45