Prognostic Assessment of the Performance Parameters for the Industrial Diesel Engines Operated with Microalgae Oil

A study conducted on the high-speed diesel engine (bore/stroke: 79.5/95.5 mm; 66 kW) running with microalgae oil (MAO100) and diesel fuel (D100) showed that, based on Wibe parameters (m and φ_z), the difference in numerical values of combustion characteristics was ~10% and, in turn, resulted in close energy efficiency indicators (${\eta }_i$) for both fuels and the possibility to enhance the NO_x-smoke opacity trade-off. A comparative analysis by mathematical modeling of energy and traction characteristics for the universal multi-purpose diesel engine CAT 3512B HB-SC (1200 kW, 1800 min⁻¹) confirmed the earlier assumption: at the regimes of external speed characteristics, the difference in P_me and η_i for MAO100 and D100 did not exceeded 0.7–2.0% and 2–4%, respectively. With the refinement and development of the interim concept, the model led to the prognostic evaluation of the suitability of MAO100 as fuel for the FPT Industrial Cursor 13 engine (353 kW, 6-cylinders, common-rail) family. For the selected value of the indicated efficiency ${\eta }_i$ = 0.48–0.49, two different combinations of φ_z and m parameters (φ_z = 60–70 degCA, m = 0.5 and φ_z = 60 degCA, m = 1) may be practically realized to achieve the desirable level of maximum combustion pressure P_max = 130–150 bar (at α~2.0). When switching from diesel to MAO100, it is expected that the ${\eta }_i$ will drop by 2–3%, however, an existing reserve in P_max that comprises 5–7% will open up room for further optimization of energy efficiency and emission indicators.