A prototype Diesel common rail direct-acting piezoelectric injector has been used to study the influence of fuel injection rate shaping on spray behavior (liquid phase penetration) under evaporative and non-reacting conditions. This state of the art injector allows a fully flexible control of the nozzle needle, enabling various fuel injection rates typologies under a wide range of test conditions. The tests have been performed employing a novel continuous flow test chamber that allows an accurate control on a wide range of thermodynamic test conditions (up to 1000 K and 15 MPa). The temporal evolution of the spray has been studied recording movies of the injection event with a fast camera (25 kfps) by means of the Mie scattering visualization technique. The analysis of the results showed a strong influence of needle position on the behavior of the liquid length. The needle position controls the effective pressure upstream of the nozzle holes. Higher needle lift is equivalent to higher effective pressures. According to the free-jet theory, the stabilized liquid-length depends mainly on effective diameter, spray cone-angle and fuel/air properties and does not depend on injection velocity. Therefore, higher injection pressures gives slightly lower liquid length due to small change in the spray cone-angle. However, partial needle lifts has an opposite effect: lower effective pressure upstream of the nozzle holes shows a dramatic increase on the spray cone-angle, reducing the liquid length. This behavior could be explained mainly due to the fact that the flow direction upstream of the nozzle holes is affecting the area coefficient, or in other words, the effective diameter of the holes.
Skip Nav Destination
ASME 2012 Internal Combustion Engine Division Spring Technical Conference
May 6–9, 2012
Torino, Piemonte, Italy
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-4466-3
PROCEEDINGS PAPER
Effect of Injection Rate Shaping Over Diesel Spray Development in Non Reacting Evaporative Conditions Available to Purchase
Raul Payri,
Raul Payri
Universitat Politecnica de Valencia, Valencia, Spain
Search for other works by this author on:
Jaime Gimeno,
Jaime Gimeno
Universitat Politecnica de Valencia, Valencia, Spain
Search for other works by this author on:
Michele Bardi,
Michele Bardi
Universitat Politecnica de Valencia, Valencia, Spain
Search for other works by this author on:
Alejandro Plazas
Alejandro Plazas
General Motors Global R&D, Warren, MI
Search for other works by this author on:
Raul Payri
Universitat Politecnica de Valencia, Valencia, Spain
Jaime Gimeno
Universitat Politecnica de Valencia, Valencia, Spain
Michele Bardi
Universitat Politecnica de Valencia, Valencia, Spain
Alejandro Plazas
General Motors Global R&D, Warren, MI
Paper No:
ICES2012-81206, pp. 347-356; 10 pages
Published Online:
July 18, 2013
Citation
Payri, R, Gimeno, J, Bardi, M, & Plazas, A. "Effect of Injection Rate Shaping Over Diesel Spray Development in Non Reacting Evaporative Conditions." Proceedings of the ASME 2012 Internal Combustion Engine Division Spring Technical Conference. ASME 2012 Internal Combustion Engine Division Spring Technical Conference. Torino, Piemonte, Italy. May 6–9, 2012. pp. 347-356. ASME. https://doi.org/10.1115/ICES2012-81206
Download citation file:
31
Views
Related Proceedings Papers
Related Articles
Investigation of the Influence of Injection Rate Shaping on the Spray Characteristics in a Diesel Common Rail System Equipped with a Piston Amplifier
J. Fluids Eng (November,2005)
The Effects of Diesel Injector Needle Motion on Spray Structure
J. Eng. Gas Turbines Power (January,2011)
Rapid Characterization of Fuel Atomizers Using an Optical Patternator
J. Eng. Gas Turbines Power (July,1999)
Related Chapters
Internal and Near Nozzle Flow Simulations of Gasoline Multi-Hole Injector (ECN Spray G) with Transient Needle Motion
Proceedings of the 10th International Symposium on Cavitation (CAV2018)
Antilock-Braking System Using Fuzzy Logic
International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-China 2011), Volumes 1–3
Model and Simulation of Low Elevation Ground-to-Air Fading Channel
International Conference on Instrumentation, Measurement, Circuits and Systems (ICIMCS 2011)