Influence of fish oil and waste cooking oil as post mixed binary biodiesel blends on performance improvement and emission reduction in diesel engine

[Display omitted] •Effect of fish oil and waste palm cooking oil biodiesel a blends were investigated.•PMBD20 blend physio-chemical properties depict close resemblance to diesel.•BTE, BSFC, and EGT for PMBD20 are 2.06%↓; 1.82%↑, and 6.31%↑ than diesel fuel.•Smoke intensity, CO and HC were 15.4%↓, 18.2%↓ and 23.4%↓ lower for diesel.•NOx was 10.66%↑ higher for PMBD20 than fossil diesel at highest load of 5.02 kW.•CP and HRR showed diminishing values of 1.13%↓ and 1.06%↓ than diesel fuel. The expanding and escalating of natural and non-renewable resources at a very faster rate has caused a serious threat to environmental pollution and humanity, has compelled the scientist, environmentalist and other researchers to look out for an alternative means to meet the growing requirements. Present paper briefly elaborates the performance, combustion and emission characteristics of a single-cylinder four-stroke, direct injection diesel engine fueled with fish oil biodiesel and waste palm cooking oil biodiesel via. Transesterification process in different volume proportionate (PMBD10, PMBD20, WBD10, WBD20, FBD10, FBD20, WBD100 and FBD100) obtained very easily from the boy’s hostel of KIIT University. In addition, fish oil was collected from the Falcon Marine Exports, Bhubaneswar at very low price. During experimentation, various engine parameters were modified and kept constant throughout the experimentation, i.e., the advanced compression ratio (18:1), injection timing (24°bTDC), injection pressure (230 bar), modified piston head geometry (Toroidal re-entrant chamber) and the speed at 1500 m−1. Results depicted PMBD20 to showcase close resemblance to diesel fuel. Moreover, it depicts higher specific fuel consumption and lower thermal efficiency of 1.82%↑ higher and 2.06%↓ lower than diesel. Similarly, carbon monoxide, hydrocarbon and smoke intensity were diminished by 18.2%↓, 23.4%↓ and 15.4%↓ lower, but at the cost of higher oxide of nitrogen i.e. 10.66%↑ higher, in contrast to diesel fuel for better environmental sustainability and security.