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THE INFLUENCE OF FUEL THERMODYNAMICAL PROPERTIES AND INJECTION RATE ON INJECTOR CONTRACTION COEFFICIENT AND REYNOLDS NUMBER – NUMERICAL ANALYSIS

The influences of liquid fuel temperature, pressure and injection rate on fuel contraction coefficient and Reynolds number for a typical fuel injector were numerically investigated. Nozzle geometry parameters remained constant during the analysis. Calculations were performed with a standard diesel fuel D2. Increase in fuel injection rate causes an increase in the fuel contraction coefficient, while the increase in fuel pressure decreases fuel contraction coefficient. Increase in fuel temperature causes an increase in contraction coefficient. For the lower fuel pressures, an increase in the injection rate causes only slight increase in contraction coefficient for every observed fuel temperature, while at higher fuel pressures increase in the injection rate causes significant increase in contraction coefficient especially for lower fuel temperatures. The highest Reynolds numbers were obtained for the highest injection rates. Increase in fuel temperature causes an increase in Reynolds number for every fuel pressure, while an increase in fuel pressure causes decrease in Reynolds number for every fuel temperature.

Fuel properties ; Fuel injector ; Fuel contraction coefficient ; Reynolds number ; Numerical analysis

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