Liquid Fuel Injection Body with Discrete Throttle Passages
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Solution Overview
Problem
Existing liquid fuel injectors of the air-blast type have a film thickness of injected liquid fuel that is not minimized sufficiently, limiting the reduction of particle diameters of atomized fuel droplets.
Innovation Solution
A liquid fuel injection body with an annular fuel passage defined by a fuel passage outer wall and inner wall, featuring discrete throttle passages on the upstream side with a cylindrical throttle passage outer wall and a non-flush throttle passage inner wall, which reduces the film thickness of the injected liquid fuel by promoting uniform spreading and atomization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the throttle groove is opened over the entire region between the inner pipe and intermediate pipe, then the fuel flow path is formed, but the film thickness of the injected liquid fuel cannot be reduced sufficiently
Solution Approach 1:
The throttle groove is divided into multiple discrete throttle passages arranged in the circumferential direction, each with specific dimensional constraints. This segmentation allows precise control of the film thickness at each passage while maintaining overall fuel flow capability.
Solution Approach 2:
The throttle passages are positioned at specific locations within the fuel flow path, creating localized regions of controlled thickness. The non-flush configuration at the inner wall creates a specific local geometry that optimizes film thickness reduction without requiring complete structural modification.
2Productivity
If the film thickness of the liquid fuel is reduced, then the atomization performance is improved, but the structural design becomes more complex
Solution Approach 1:
The fuel flow path is segmented into multiple discrete throttle passages, each contributing to the overall atomization process. This segmentation enables fine control of film thickness while distributing the structural complexity across multiple standardized passages.
Solution Approach 2:
The invention specifies precise dimensional parameters for the throttle passages, including the non-flush configuration at the inner wall. By controlling these parameters, the film thickness is reduced to optimize atomization performance without requiring complex variable geometry.
3Manufacturing precision
If the throttle passage inner wall is made flush with the fuel passage inner wall, then the manufacturing is simplified, but the film thickness cannot be minimized
Solution Approach 1:
The throttle passage inner wall is intentionally designed to be non-flush with the fuel passage inner wall, creating an asymmetric configuration. This asymmetry is deliberate and necessary to achieve the minimum film thickness, as the offset creates a thinner fuel film in the annular passage.
Solution Approach 2:
The non-flush configuration is applied locally at the inner wall of the throttle passages, creating a specific geometric feature that optimizes film thickness. This localized quality change achieves the desired film thickness reduction without requiring complete redesign of the entire injection body structure.
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 solution effectively reduces the film thickness of the injected liquid fuel, leading to smaller particle diameters of atomized droplets and improved atomization performance, suitable for gas turbine engines with strict weight reduction requirements.
Implementation Method 1
a liquid fuel injected in a film form from a liquid fuel injection body is atomized using a shear force caused by a difference in velocity between the liquid fuel and an air flow flowing adjacently to the liquid fuel
Implementation Method 2
The liquid fuel injector (air-blast type fuel nozzle) is configured to atomize a liquid fuel injected as an annular liquid film from a fuel flow path (5) formed between an inner pipe (1) and an intermediate pipe (2) using a shear force acting between inner air (a1) and outer air (a2) flowing adjacently to each other in the radial direction
Data Source
AI summary
Provided is a liquid fuel injection body capable of further reducing a film thickness of an injected liquid fuel. A liquid fuel injection body includes: an annular fuel passage extending in an axial direction and provided inside the liquid fuel injection body, the fuel passage is defined by a fuel passage outer wall located outward in a radial direction and a fuel passage inner wall located inward in the radial direction, a plurality of throttle passages disposed discretely in a circumferential direction are provided at a portion of the fuel passage on an upstream side with respect to a downstream end of the fuel passage, each of the throttle passages is defined by a throttle passage outer wall located outward in the radial direction and formed as a cylindrical surface, a throttle passage inner wall located inward in the radial direction, and two throttle passage side walls connecting end portions of the throttle passage outer wall and the throttle passage inner wall in the circumferential direction, and the throttle passage outer wall and the fuel passage outer wall are flush whereas the throttle passage inner wall and the fuel passage inner wall are not flush.