Convergent Air-Debris Separator for Aircraft Powerplant Airflow
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Solution Overview
Problem
Existing aircraft powerplant systems face challenges in effectively separating airflows to manage debris and maintain efficient operation, particularly in gas turbine engines, where debris can accumulate and clog critical components.
Innovation Solution
The implementation of an air-debris separator with a convergent-divergent geometry and swirler vanes within the separation passage to separate airflow into clean and dirty streams, directing debris-laden air to larger quench apertures and clean air to smaller cooling passages, thereby reducing debris accumulation on engine components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air-debris separator is used to separate airflow, then debris accumulation is minimized and reliability is improved, but device complexity increases due to additional separation passages and outlet passages
Solution Approach 1:
The air-debris separator divides the airflow into separate clean and dirty streams using distinct separation passages and outlet passages. The separator includes a center body, inner wall, and outer wall that create multiple fluidly coupled passages, allowing debris-laden air to be directed to larger quench apertures while clean air flows through smaller cooling passages, thus improving reliability without excessive complexity
Solution Approach 2:
The air-debris separator acts as an intermediary component between the compressor and combustion chamber, using swirler vanes and convergent-divergent geometry to separate debris from airflow before air enters critical engine components. This intermediary device protects the engine by filtering debris while maintaining efficient airflow paths
2Manufacturing precision
If convergent-divergent geometry is used in separation passage, then separation efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The separation passage employs convergent-divergent geometry that changes the cross-sectional area parameters along its length. The passage area decreases in the convergent section and increases in the divergent section, creating optimal flow conditions for debris separation. This parameter variation improves separation efficiency while remaining manufacturable using standard aerospace fabrication techniques
3Reliability
If swirler vanes are added to separation passage, then debris separation is enhanced, but device complexity and manufacturing cost increase
Solution Approach 1:
The swirler vanes create rotational motion and turbulence in the airflow, enhancing the separation of debris particles from the air stream. As air enters the separation passage, the swirler vanes impart angular momentum, causing debris to migrate outward toward the walls while clean air continues along the center, improving separation effectiveness
Solution Approach 2:
The swirler vanes utilize aerodynamic forces to separate debris from airflow. The rotational flow pattern created by the vanes generates centrifugal forces that act on debris particles, causing them to move toward the separation passage walls where they can be removed, while clean air remains in the central flow path
4Productivity
If debris is directed to larger quench apertures, then clogging is reduced, but loss of clean air to cooling passages decreases
Solution Approach 1:
The air-debris separator creates distinct flow paths that segment clean and dirty air streams. The clean air outlet passage directs purified airflow to smaller cooling passages, while the dirty air outlet passage directs debris-laden air to larger quench apertures. This segmentation ensures that cooling passages receive only clean air for optimal heat transfer, while quench apertures handle debris removal
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 air-debris separator effectively separates airflow to minimize debris accumulation, enhancing the reliability and efficiency of the powerplant by ensuring clean air flows through smaller passages while directing debris to larger apertures, thus reducing clogging and maintaining optimal engine performance.
Implementation Method 1
The air-debris separator is configured to separate an airflow received within the separation passage and swirled by the separator swirler into a clean airflow and a dirty airflow
Implementation Method 2
The separation passage includes a convergent section and a radial outer diameter that decreases as the convergent section extends longitudinally towards the first outlet passage and the second outlet passage
Data Source
AI summary
An air-debris separator includes a center body, an inner wall, an outer wall, a separation passage, a first outlet passage and a second outlet passage. The center body extends longitudinally along a longitudinal centerline. The inner wall and the outer wall extend longitudinally along and circumferentially about the center body. The separation passage extends longitudinally within the air-debris separator to the first outlet passage and the second outlet passage. The separation passage is radially between the center body and the outer wall. The separation passage includes a convergent section and a radial outer diameter that decreases as the convergent section extends longitudinally towards the first outlet passage and the second outlet passage. The first outlet passage is radially between the center body and the inner wall. The second outlet passage is formed by and radially between the inner wall and the outer wall.