Multi-Nozzle Fuel Injector Tip with Counterbore for Coking Reduction
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Solution Overview
Problem
Existing fuel injector systems face issues with inconsistent fuel spray due to pressure gradients across the nozzle, leading to reduced fuel efficiency and structural integrity concerns, as well as increased coking risks when attempting to adjust nozzle geometry for improved atomization.
Innovation Solution
A multi-nozzle, multi-stage counterbore injector tip is used, featuring a primary nozzle and secondary nozzles with different geometries to enhance fuel flow turbulence and rotation, while the counterbore's increasing diameter directs fuel flow away from outlets, reducing pressure loss and coking risks, and maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the nozzle length is reduced to decrease pressure drop and improve spray velocity, then fuel atomization is improved, but structural integrity of the injector body is compromised
Solution Approach 1:
The flow passage is segmented into multiple sections with varying diameters (first section with diameter D1, second section with diameter D2 where D2 > D1). This segmentation allows the passage to be shortened while maintaining structural integrity through the expanded second section that provides additional structural support.
Solution Approach 2:
The flow passage transitions from a narrow first section to a wider second section, utilizing dimensional change to reduce pressure drop while maintaining structural integrity. The expansion in cross-sectional area allows for shorter length while preserving strength.
2Manufacturing precision
If the nozzle diameter is reduced to increase atomization, then spray quality is improved, but coking risk increases due to exposure to high temperature gas flow
Solution Approach 1:
The nozzle is divided into two sections: a first section with smaller diameter for atomization, and a second section with larger diameter that protects against coking. This segmentation allows each section to serve its specific function optimally.
Solution Approach 2:
Different sections of the flow passage have different diameters tailored to local requirements: the first section has smaller diameter for atomization while the second section has larger diameter for protection against coking from high temperature gas flow.
3Reliability
If multiple nozzles are added to improve spray distribution, then fuel delivery consistency is improved, but device complexity increases
Solution Approach 1:
The fuel delivery system is segmented into multiple nozzles (first nozzle and second nozzle) that deliver fuel through separate flow passages, improving spray distribution consistency while maintaining manageable complexity through modular design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration increases fuel efficiency and extends the injector's useful life by improving atomization and reducing coking, while maintaining structural integrity and fuel delivery consistency.
Implementation Method 1
A multi-nozzle, multi-stage counterbore injector tip is used, featuring a primary nozzle and secondary nozzles with different geometries to enhance fuel flow turbulence and rotation
Implementation Method 2
actuating an injector needle from a first position to a second position to open a venturi-shaped primary nozzle
Implementation Method 3
a pressure gradient may form along the length of the nozzle, with a lower pressure at an outlet of the nozzle than at an inlet where fuel is introduced
Data Source
AI summary
Methods and systems are provided for a fuel injector for an engine. In one example, the injector may be adapted with a plurality of nozzles configured to enhance atomization of fuel. The plurality of nozzles may have geometries that increase turbulence and rotation of fuel flow therethrough. In some examples, the injector may also include a multi-stage counterbore that reduces a likelihood of coking at the injector.