Response Analysis of an Experimental Study on the Effect of Speed and Premixed Fuel Ratio on Performance and Emissions in RCCI Engine

Table 4

Estimated model coefficients for SNR.

Term	Coeff	SE coef	T	value
Constant	6.3988	0.7713	8.296	0.001
Speed 2200	−5.7546	1.0908	−5.276	0.006
Speed 2600	0.7647	1.0908	0.701	0.522
PMF ratio	−3.7985	1.0908	−3.482	0.025
PMF ratio 25/75	2.9879	1.0908	2.739	0.052

PMF ratio: premixed fuel blend ratio; SNR: signal-to-noise ratio; SE coef: significant error coefficient; Coeff; coefficient; : statistical significance; S = 2.3139; R-Sq = 92.05%; R-Sq(adj) = 84.09%.