Gimballed Super-cooled Droplet Size Indicator
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Solution Overview
Problem
Ice formation on aircraft surfaces increases weight and drag, reduces lift and thrust, and affects controllability due to varying atmospheric conditions, necessitating a method to predict and measure super-cooled water droplet sizes for effective de-icing.
Innovation Solution
A super-cooled water-droplet size measurement system with a convex housing and gimballed mounting mechanism, featuring visual indices on its surface that accrete ice when exposed to super-cooled water droplets, allowing alignment with the airstream and indicating maximum droplet sizes through ice formation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual indices are provided on the housing surface to indicate ice accretion regions, then measurement precision of droplet size is improved, but device complexity increases due to the need for multiple indexed regions
Solution Approach 1:
The housing surface is segmented into multiple ice-accretion regions, each with a visual index indicating a specific minimum droplet size threshold. This segmentation allows the single device to measure a range of droplet sizes by showing which regions have ice accretion, thereby improving measurement precision without requiring multiple separate devices.
Solution Approach 2:
The visual indices on the housing surface change appearance based on ice accretion in their corresponding regions. When super-cooled water droplets of sufficient size strike the housing, ice forms on specific regions and becomes visible against the background, providing a visual indication of droplet size thresholds without requiring electronic sensors or complex instrumentation.
2Adaptability or versatility
If the housing is made gimballed to align with airstream direction, then adaptability to varying flight conditions is improved, but device complexity increases due to the gimballed mounting mechanism
Solution Approach 1:
The housing is mounted on a gimballed mechanism that allows it to dynamically adjust its orientation in response to airstream forces. This dynamic adaptation ensures the housing always presents its convex surface perpendicular to the incoming airflow, regardless of aircraft pitch or yaw changes, improving adaptability to varying flight conditions while using a relatively simple mechanical gimbal structure.
Solution Approach 2:
The gimballed mounting mechanism allows the housing to self-align with the airstream direction through aerodynamic forces alone. The housing automatically orients itself perpendicular to the incoming flow without requiring active sensors, motors, or control systems, thereby achieving adaptability with minimal added complexity.
3Reliability
If the convex exterior surface is used to accrete ice from super-cooled water droplets, then reliability of ice detection is improved, but object-generated harmful factors increase due to ice accumulation on the sensor surface
Solution Approach 1:
The ice accretion that occurs on the housing surface is not treated as a problem to be prevented, but rather as the desired measurement signal. By extracting and visualizing the ice accretion pattern on the convex surface, the system converts the harmful effect of ice accumulation into useful information about super-cooled droplet size, improving detection reliability while the de-icing system handles the actual ice 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
Enables accurate detection of super-cooled water droplet sizes, providing pilots with real-time atmospheric data to prevent ice accumulation, thereby maintaining aircraft performance and safety by aligning the housing with the airstream and using visual indices to indicate ice formation regions.
Implementation Method 1
When an airstream engages the stabilizers, the housing aligns with a direction of the engaging airstream
Implementation Method 2
The sequence of ice-accretion regions accretes ice when the engaging airstream contains super-cooled water droplets of at least a corresponding sequence of predetermined minimum sizes
Implementation Method 3
accretes ice when the engaging airstream contains super-cooled water droplets
Data Source
AI summary
Apparatus and associated devices relate to a system for measuring a maximum size of super-cooled water droplets in a cloud atmosphere. The system includes a housing having a convex exterior surface on a forward end and having stabilizers projecting from an aft end. The system includes a gimballed mounting mechanism configured to attach the housing to an aircraft while permitting the housing to freely pitch and yaw with respect to the aircraft. When an airstream engages the stabilizers, the housing aligns with a direction of the engaging airstream. The system includes a sequence of indices on a corresponding sequence of ice-accretion regions of the convex exterior surface, each of the sequence of indices visible in the absence of ice accretion. The forward-most ice-free one of the sequence of indices is indicative of a maximum size of super-cooled water droplets.