Effects of Fuel Returned Shape on Metering Devices Characteristics

In order to evaluate the impact of fuel returned shape on characteristics of fuel metering devices,the simulation model of fuel metering device was established based on Matlab.The triangle,rectangle,circle fuel returned shape characteristics were studied with the same inputs and the simulation were compared and analyzed.The results show that fuel returned shape has great influence on the stability and flow characteristics of the device,and with the same condition,the triangle shape's is the best,while the rectangle's is the worst.Moreover,when the valve opens,the opening area characteristics and flow characteristics of the rectangle and circle shape have oscillation phenomenon,but the triangle 's is stable.