Experimental Study On Injection Characteristics Of Hydrotreated Vegetable Oil-Diesel Blends Using Common Rail System
EXPERIMENTAL STUDY ON INJECTION CHARACTERISTICS OF HYDROTREATED VEGETABLE OIL-DIESEL BLENDS USING COMMON RAIL SYSTEM.
Hydrotreated Vegetable Oil (HVO), a modern paraffinic fuel, is seen as a promising substitution for petroleum fuel. This paper focused on the analysis of the physical and chemical properties of HVO-commercial diesel fuel blends. Then, the influence of fuel properties to injection characteristics was investigated under Zuech method. Experiment was carried out at 1000bar injection pressure, constantly 40bar back pressure, 2.5ms energizing time using common rail fuel injection system with single hole injector. The experimental results indicated that the analyzed fuel properties have linear relationship with HVO weight fraction. Injection characteristics of HVO and its blends had the same propensity with commercial diesel fuel.
The impact of lower bulk modulus of HVO and blended fuels caused by smaller density was not significantly when comparing with the effect of fuel viscosity on injection delay. Shorter injection delay was noticed with higher HVO fraction. Due to lower density (5.52%) and smaller viscosity (18.48%) than commercial diesel fuel, HVO and blends had lower injection rate and discharge coefficient. This difference also affected to injection quantity recorded smaller with higher HVO weight fraction in blend. The obtained results provide useful information for supporting further researches of spray and combustion to optimal control conditions of diesel engine fuelled with HVO fuel.
Key words: Hydrotreated Vegetable Oil (HVO), Bulk Modulus of Elasticity, Injection Rate Zuech Method, Injection Characteristics, Common-Rail Injection System.