Analysis of Straight Vegetable Oil (SVO) Spray Characteristic and Droplets Distribution By Using udNano-Spark Shadowgraph Photography Technique

摘要

Abstract - Biofuel is an alternative fuel to reduce the dependent on fossil fuel due to the limited oil udstock and increment of oil prices. Straight vegetable oil (SVO) has several superior combustion udcharacteristics such as less hydrocarbons, carbon monoxide and particulate matter compared to uddiesel fuel. More advantages are high biodegradability, excellent lubricity and no sulfur content. udDuring combustion, approximately 10wt% of its oxygen content promote more complete combustion udprocess and effectively reduce unburned hydrocarbons (UHC), carbon monoxide (CO) as well as udsuspended aerosol carbon granules. However, high kinematic viscosity of SVO affects the spray udcharacteristics thus effect the engine efficiency. In this study, the effect of kinematic viscosity of SVO udon fuel injection spray characteristic are investigated using constant volume high pressure spray udchamber and nano-spark shadowgraph photography technique.