Air Swirlers with Radially Offset Converging Slots
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Solution Overview
Problem
Conventional swirlers in gas turbine engines lack improved flow characteristics, thermal performance, and adaptability, and are not easily manufactured or utilized.
Innovation Solution
A swirler design with radially offset, elongated swirl slots that converge towards the longitudinal axis, mounted within an injector body, providing a unique flow path that enhances air flow swirl and fuel atomization, and allowing for thermal management by reducing thermal gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional helically vaned swirlers are used, then air flow swirl is achieved, but flow characteristics and thermal performance are limited
Solution Approach 1:
The swirler body is segmented into multiple swirl slots instead of using a continuous helical vane structure. This segmentation allows independent optimization of each slot's geometry (angle, width, length) to control air flow characteristics and thermal performance separately, enabling adaptability to different application requirements while maintaining reliable swirl generation.
Solution Approach 2:
Different portions of the swirler wall have different local geometries - the swirl slots vary in angle, width, and length along the axial direction. This local quality variation allows optimization of air flow turning at different locations, improving both flow characteristics and thermal performance by matching the swirl requirements at each section of the nozzle.
2Reliability
If complex swirler designs are implemented to improve flow characteristics, then performance is enhanced, but manufacturing difficulty increases
Solution Approach 1:
The invention optimizes geometric parameters of the swirl slots (angles between 10-45 degrees, varying widths and lengths) to achieve improved flow characteristics. These parameter changes are implemented within conventional manufacturing capabilities, allowing complex flow control through simple geometric variations rather than complex structural designs.
Solution Approach 2:
Instead of using traditional helical vanes that require complex shaping and assembly, the invention inverts the approach by using straight or slightly curved slots with optimized angles. This inverted geometry achieves similar or superior flow characteristics while being much easier to manufacture using standard machining or molding processes.
3Ease of operation
If swirl slots are positioned radially offset from the longitudinal axis, then swirl is imparted to the air flow, but manufacturing precision requirements increase
Solution Approach 1:
The swirl slots are deliberately positioned radially offset from the longitudinal axis of the swirler body, creating an asymmetric configuration. This asymmetry generates the required swirl in the air flow as it passes through the slots. The offset distance is optimized to achieve effective swirl while remaining within conventional manufacturing tolerances for radial positioning.
Solution Approach 2:
The radial offset distance of the swirl slots is carefully selected as an optimized parameter. By changing this parameter to specific values, the invention achieves effective swirl generation while keeping the positioning requirements within standard manufacturing capabilities, avoiding excessive precision demands.
4Reliability
If swirl slots converge toward the longitudinal axis, then flow characteristics are improved, but device complexity increases
Solution Approach 1:
The swirl slots are designed with a converging geometry toward the longitudinal axis, creating a dynamic variation in slot orientation and opening along the axial direction. This dynamic geometry optimizes the air flow turning angle at different sections, improving flow characteristics by matching the local flow conditions rather than using a static uniform slot configuration.
Solution Approach 2:
The converging swirl slots introduce curvature to the air flow path as it moves through the swirler. This curved flow path, achieved through the converging slot geometry, improves mixing and atomization characteristics while the curvature is designed to be manufacturable using standard forming or machining techniques.
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 swirler design achieves superior flow characteristics, enhanced fuel atomization, and adaptability for specific applications, while offering improved thermal management and ease of manufacturing.
Implementation Method 1
The swirl slots are radially off-set with respect to the longitudinal axis for imparting swirl on a flow passing from the inlet opening, through the swirl slots, and past the outlet end of the swirler body
Implementation Method 2
A plurality of swirl slots is defined through a portion of the swirler wall that converges toward the longitudinal axis in a direction from the inlet opening toward the outlet end of the swirler body
Implementation Method 3
providing a unique flow path that enhances air flow swirl and fuel atomization, and allowing for thermal management by reducing thermal gradients
Data Source
AI summary
A swirler, such as for swirling air in a fuel injector of a gas turbine engine, includes a swirler body with opposed inlet and outlet ends with a swirler wall extending therebetween along a longitudinal axis. The inlet end of the swirler body defines an inlet opening. A plurality of swirl slots is defined through a portion of the swirler wall that converges toward the longitudinal axis in a direction from the inlet opening toward the outlet end of the swirler body. The swirl slots are radially off-set with respect to the longitudinal axis for imparting swirl on a flow passing from the inlet opening, through the swirl slots, and past the outlet end of the swirler body.