Development of a Technique for Measuring the Internal Flow of Fuel Nozzles by Using Fluorescence PIV

A new quantitative technique for measuring the internal flow of fuel injection nozzles was developed. This technique is characterized by the use of transparent models enlarged seven times, and application of the refractive index matching method using Turpentine-Tetraline mixing oil and the fluorescence PIV that can eliminate the light scattered from gas-liquid border surface. This technique enables the measurement of velocity flow field in the sac chamber and nozzle holes. And, we report one analyzing result applied the multi-hole nozzle by using this method.