Swirl Particle Separator for Low-Pressure Water Droplet Removal
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Solution Overview
Problem
Current particle separators in aircraft condenser heat exchangers face high air velocities in inlet ducts, leading to large pressure losses and inefficiencies in removing water droplets from airflow before it reaches the cabin.
Innovation Solution
A particle separator design featuring a cylindrical vessel with a fluid swirl passage and scupper cavity, where the fluid inlet imparts centrifugal force to separate water droplets along the vessel sidewall, minimizing pressure losses by eliminating the need for swirl vanes and allowing energy recovery from swirling air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high air velocities are used in inlet ducts to force water droplets to the outer wall, then particle separation efficiency is improved, but pressure losses increase significantly
Solution Approach 1:
The particle separator is divided into distinct functional zones: an inlet region for high-velocity flow, a separation region with centrifugal force generation, and an outlet region for low-velocity flow. This segmentation allows the system to achieve effective particle separation while managing pressure losses through controlled flow transitions between zones.
Solution Approach 2:
The design transitions from one-dimensional linear flow to two-dimensional radial flow by directing airflow along the curved inner surface of the outer wall toward the periphery. This dimensional change enables centrifugal separation of particles while maintaining lower overall pressure losses compared to straight-through high-velocity flow.
2Productivity
If swirl vanes are added to generate centrifugal force for particle separation, then separation efficiency is improved, but device complexity and volume increase
Solution Approach 1:
The patent removes the swirl vane component entirely, extracting the centrifugal force generation function from a separate mechanical element and integrating it into the geometry of the inlet duct and outer wall structure. This eliminates the need for movable or complex vane mechanisms while maintaining separation efficiency.
Solution Approach 2:
The inlet duct and outer wall are merged into a unified structural design where the curved geometry of the outer wall itself generates centrifugal force. This consolidation eliminates separate swirl vane components and reduces overall device complexity while achieving the same particle separation function.
3Productivity
If swirl vanes are used to create centrifugal force, then particle separation is improved, but the volume of the device increases
Solution Approach 1:
The outer wall is designed with a curved geometry that naturally generates centrifugal force as airflow moves along its surface. This curved configuration replaces the need for additional volumetric space required by traditional swirl vanes, achieving compact particle separation within a smaller overall device volume.
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 design effectively collects water droplets with low pressure losses and minimizes re-entrainment, maintaining a compact volume without swirl vanes, thus enhancing airflow quality and reducing moisture issues in aircraft cabins.
Implementation Method 1
forcing the airflow to swirl such that the water droplets travel to an outer wall of the swirler due to centrifugal force
Data Source
AI summary
A particle separator comprises a vessel, a fluid inlet, a fluid swirl passage, a scupper cavity, a first fluid outlet, and a second fluid outlet. The vessel includes a vessel sidewall extending between a vessel top side and a vessel bottom side. The fluid swirl passage includes a first passage end in communication with a fluid inlet disposed on the vessel top side. A second passage end is in communication with a vessel swirl cavity defined at least in part by an inner surface of the vessel sidewall. The scupper cavity includes a scupper entrance disposed along the inner surface of the vessel sidewall, and is spaced circumferentially apart from the second passage end. The first fluid outlet is in communication with the scupper cavity and disposed on the vessel bottom side. The second fluid outlet is disposed above the first fluid outlet in communication with the vessel swirl cavity.