دانلود رایگان مقاله اثر اتانول گرم در مقاوم سازی عملکرد تک حفره بنزین انژکتور

Abstract

The main aim of this work is to explore the injector performance in terms of fuel mass flow rate and discharge coefficient when ethanol is in use with gasoline injectors at elevated temperatures. The operating fuel injection was at the pressures between 0.2 and 0.4 MPa and the temperatures in a range of 40–80 °C. A fuel injector test cell with electronic control for injection pulse, timing and pressure was set to 120 Hz and 60 min injection duration to drive three single-hole 0.34 mm nozzle diameter injectors. The fuels were injected into a known volume flask at quiescence atmospheric pressure and weighed to attain the fuel mass flow rates. By this manner, the discharge coefficient can be calculated by the assumptions of quasi steady, incompressible and one dimensional flow through each injector. When operating at 40 °C injection temperature, ethanol delivered greater fuel amounts than gasoline resulting in higher discharge coefficients. The temperatures of the injected fuels are shown to affect the fuel flow rates and the discharge coefficients.

4. Conclusion

The single-hole gasoline injector performance with retrofit use of ethanol at 0.2–0.4 MPa and 40–80 °C can be concluded as the followings, based on the assumption that the fuel flow was quasi steady, incompressible, and one dimensional.
At constant fuel temperature, ethanol delivered greater fuel amounts than gasoline. Both fuels showed greater flow at higher pressure drop across the injector nozzle.
Higher discharge coefficients were observed for ethanol. By the conditions used in the test, the heated ethanol up to 60 °C benefits for both terms of mass flow rate and discharge coefficient. Calibrating fuel injection timing and duration, and adding fuel preheating element are recommended when an OEM gasoline injector has to be retrofit by ethanol fuel.