Erinç Uludamar

Vibration Analysis of a Diesel Engine Fuelled with Sunflower and CanolaBiodiesels

Biodiesel is one of the most popular alternative fuels. The usage of biodiesel is increasing day by day. Therefore, all effects of biodiesel on internal combustion engines must be known. In this study, vibration effect of canola (rapeseed), sunflower biodiesel and their blends with low sulphur diesel fuel was investigated. Fuels were tested in a four cylinder four stroke diesel engine at 1300, 1600, 1900, 2200, 2500 and 2800 rpm engine speed. The results showed that with the use of biodiesel blend with low sulphur diesel fuel up to 40% proportions, vibration values get significantly lower at all engine speed. The least vibration value for most of the fuel was observed with the use of 60% biodiesel blend. The results were also individually interpreted in longitude, vertical and lateral axes.

Finite Element Analysis of Electric Bike Rims Coupled with Hub Motor

In this study, static and fatigue analysis of three different electrical bikes’ rim which are coupled with electrical hub motor was investigated. Loading conditions were applied on rim in order to simulate driving forces that exert on road conditions. Analysis results of three rims were compared with each other. According to results, sharp edges increase von-Mises stresses and decrease fatigue safety factor due to stress concentration on the corners. Also, it was observed that contact area of spokes to flange affects the total deformation and von-Mises stress distribution. Three dimensional models of the rims were designed with the aid of CATIA V5 and their computational analyses were carried out with ANSYS WORKBENCH software program.

Optimization of Fuel Inlet Port Geometry of an Air Assisted Diesel Injector

Diesel fuel is injected into the combustion chamber by the use of injectors. Atomization process is characterized by directing extremely pressurized fuel into the injector orifices in modern injectors. However, this high pressure level, which exceed 1300 bars in some cases, causes cavitation before discharge nozzle and results in mechanical wear. In air assisted atomizers, pressured air is utilized for atomization. This type of injectors eliminates cavitation erosion by reducing injection pressure and they create finer spray geometry. Mixing process of air and fuel has a vital importance since it directly affects level of atomization in air assisted atomizers. Therefore the aim of this study was determine influence of different inlet port geometries on flow characteristics of a specially designed diesel injector which is developed for diesel fuel atomization, by using computational fluid dynamics techniques.