Combustion of Waste Rapeseed Oil and Jet Propellant‐8 Blends in a CI Engine

ABSTRACT The study examines the potential of blending waste rapeseed oil (WRO) with Jet Propellant‐8 (JP‐8) as a fuel for compression ignition (CI) engines. The research evaluates the physicochemical properties, combustion characteristics, and emissions performance of WRO/JP‐8 blends under various engine operating conditions. The direct use of WRO in CI engines is challenged by its high viscosity, glycerine content, and potential combustion instability. These challenges can be partially addressed by blending WRO with JP‐8 and applying the CR injection system. The results show that WRO blended with JP‐8 can be burnt efficiently. However, a higher WRO content shifted the combustion mechanism from a premixed‐dominated phase to diffusion combustion. Emission analysis revealed significant benefits of WRO/JP‐8 blends. Higher oxygen content in WRO reduced total hydrocarbon (THC) and particulate matter (PM) emissions compared to JP‐8 and diesel oil. The blend with 80% WRO content exhibited the lowest NO x emissions. The study confirms the possibility of applying WRO into fuel blends with JP‐8 for CI engines, particularly in combined heat and power (CHP) applications.