Experimental and Numerical Assessment of Multi-Event Injection Strategies in a Solenoid Common-Rail Injector

Paper #:
  • 2017-24-0012

Published:
  • 2017-09-04
Abstract:
Nowadays, injection rate shaping and multi-pilot events can help to improve fuel efficiency, combustion noise and pollutant emissions in diesel engine, providing high flexibility in the shape of the injection that allows combustion process control. Different strategies can be used in order to obtain the required flexibility in the rate, such as very close pilot injections with almost zero dwell time or boot shaped injections with optional pilot injections. Modern Common-Rail Fuel Injection Systems (FIS) should be able to provide these innovative patterns to control the combustion phases intensity for optimal tradeoff between fuel consumption and emission levels. In this work, a 1D-CFD model in GT-SUITE of a solenoid ballistic Common-Rail injector was firstly refined respect to the previous work [1] and then was validated against an extensive experimental dataset of single injections, close double pilot and multi-pilot injection patterns (up to 4 pilot events) with almost zero dwell time and hydraulic fusion between two consecutive injection events. The experimental hydraulic test data used to validated the one-dimensional model were obtained by means of the STS Injection Analyzer based on the Zeuch’s method. The comparison between the experimental and simulated volumetric injection rates showed a more than satisfactory accuracy of the model in predicting the actual behavior of the ballistic injector for all the injection patterns tested, even for relatively complex injector command strategies, characterized by reduced DT values between consecutive injection events. [1] Piano, A., Millo, F., Postrioti, L., Biscontini, G. et al., "Numerical and Experimental Assessment of a Solenoid Common-Rail Injector Operation with Advanced Injection Strategies," SAE Int. J. Engines 9(1):565-575, 2016, doi:10.4271/2016-01-0563.
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