Dual-Circuit Swirl Fuel Injector for Uniform Spray Patternation
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Solution Overview
Problem
Conventional variable-area fuel injectors suffer from poor spray circumferential uniformity, leading to non-uniform fuel distribution, hot spots, and reduced fuel efficiency in air-breathing engines, as well as potential failure in applications like automotive exhaust treatment and missile systems.
Innovation Solution
A multiphase fuel injector with a dual-circuit design, featuring a primary circuit for improved atomization and a secondary circuit with a swirling component for high flow rates, eliminates the need for moving components and complex manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional variable-area fuel injectors use slots or holes to feed fuel to the fuel manifold, then the injector structure is simple, but poor patternation occurs leading to non-uniform fuel distribution and hot spots
Solution Approach 1:
The fuel injector is divided into multiple independent circuits (primary circuit with first set of holes, secondary circuit with second set of holes). Each circuit independently feeds fuel to different regions of the fuel manifold, preventing wake formation and ensuring uniform fuel distribution without requiring complex single-structure designs
Solution Approach 2:
Different regions of the fuel manifold receive fuel from different circuits with optimized hole configurations. The primary circuit serves central regions while the secondary circuit serves outer regions, allowing each region to receive optimally patterned fuel without being affected by wakes from other regions
2Productivity
If conventional variable-area fuel injectors operate throughout their pressure range, then fuel flow rate varies, but optimal spray circumferential uniformity is not achieved
Solution Approach 1:
The fuel injector dynamically switches between primary and secondary circuits based on operating conditions. At low fuel flow rates, only the primary circuit is active providing optimal patternation. At high fuel flow rates, the secondary circuit activates to maintain uniformity, creating a dynamic system that adapts to different productivity requirements while maintaining precision
3Device complexity
If a single fuel inlet is used for both primary and secondary circuits, then the injector structure is simplified, but fuel flow distribution between circuits must be controlled
Solution Approach 1:
The fuel flow distribution between primary and secondary circuits is controlled automatically by fuel pressure itself. A pressure-sensitive mechanism (such as a movable partition or spring-loaded valve) responds to fuel pressure changes, directing flow to the appropriate circuit without external control, thus simplifying the inlet structure while maintaining operational control
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
The multiphase fuel injector achieves improved atomization quality, higher turndown ratios, and increased fuel flow rates, while maintaining consistent performance and reducing the risk of hot spots and engine failure.
Implementation Method 1
The primary circuit is configured to impart a swirling action to the first flow of pressurized fuel
Implementation Method 2
The secondary circuit is configured to impart a swirling action to the second flow of pressurized fuel
Data Source
AI summary
A multiphase fuel injector has an injector body with a fuel inlet at a first end and a fuel outlet at a second end opposite the first end. A primary circuit disposed proximate the fuel inlet extends into a central portion of the injector body. The primary circuit is configured to receive a first flow of pressurized fuel from the fuel inlet that discharges into a spin chamber in the injector body downstream from the fuel inlet. The primary circuit is configured to impart a swirling action to the first flow of pressurized fuel. A secondary circuit is located in the injector body radially outward from the primary circuit. The secondary circuit is configured to receive a second flow of pressurized fuel from the fuel inlet that discharges into the fuel outlet. The secondary circuit is configured to impart a swirling action to the second flow of pressurized fuel.