Assessment of injector-flow characteristics of additised and renewable diesel blends through high-speed imaging

The influence of additives inducing viscoelasticity in diesel fuel, on the in-nozzle cavitation evolution and expelled spray morphology has been quantified by high-speed, diffused back-light schlieren imaging applied to two single-hole true-scale transparent injectors straight tapered orifice layouts (so-called Spray C D engine Combustion Network), as well a five-hole configuration (Spray M). More specifically, cavitating flow its effect near-nozzle formation non-Newtonian fuel sample treated with Quaternary Ammonium Salt (QAS) exhibiting viscoelastic effects, biodiesel (FAME), are compared against conventional for first time. operating conditions corresponded injection ambient pressures range 500–900 bar 1–20 bar, respectively. It was found that an overall suppressing wall-attached, or so-called geometrical, cavitation. Furthermore, investigation revealed action capability enhance magnitude well-established longitudinal vortices, subsequent after-effect leading increased cone angles spray. On contrary, it tends suppress turbulence-induced transient instabilities manner similar turbulence suppression.