Icing Detector Probe Segmenting Droplet Freezing
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Solution Overview
Problem
Current ice detectors face challenges in accurately distinguishing and detecting supercooled large water droplets and normal-state water droplets, leading to inaccurate identification of icing types and thickness, particularly due to complex structures and difficulties in processing large water droplets, which can result in unsafe 'backflow ice' on aircraft surfaces.
Innovation Solution
An ice detector probe with distinct segments to decelerate and freeze normal-state water droplets before reaching the outer surface, allowing large water droplets to form ice further downstream, while using a wedge-shaped normal-state icing area and stagnation area to trap and freeze large droplets, enabling accurate detection of icing types and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate flow channels and independent ice detectors are used for normal-state and large water droplets, then large water droplets can be detected, but the detector structure becomes complicated and processing becomes difficult
Solution Approach 1:
The patent merges the detection of normal-state water droplets and large water droplets into a single integrated detector structure. The probe uses a unified flow channel design with strategically positioned sensing elements that can distinguish between droplet types based on their different freezing behaviors and positions, eliminating the need for separate detectors while maintaining detection accuracy.
Solution Approach 2:
The detector probe is designed as a multi-functional device that can detect both normal-state water droplets and large water droplets simultaneously. The sensing elements are positioned to detect ice formation at different locations along the probe, allowing the same device to identify different droplet types and icing conditions without requiring multiple specialized detectors.
2Measurement precision
If the probe length in air flow direction is increased to allow normal-state water droplets to freeze before reaching the third segment, then detection accuracy of large water droplets improves, but the probe size increases
Solution Approach 1:
The probe employs local quality variations along its length, with different segments having specific functions. The first and second segments are designed to allow normal-state water droplets to freeze before reaching the third segment, while the third segment is positioned to specifically detect large water droplets. This localized functional differentiation allows accurate detection without requiring excessive probe length.
Solution Approach 2:
The probe design incorporates preliminary freezing action in the first and second segments, where normal-state water droplets are expected to freeze before reaching the third segment. This preliminary action creates a clear distinction between droplet types at the third segment location, enabling accurate detection without extending the probe unnecessarily.
3Device complexity
If a single detector is used for both normal-state and large water droplets, then device complexity is reduced, but the ability to distinguish between droplet types and accurately measure ice thickness is compromised
Solution Approach 1:
The probe introduces a spatial dimension to droplet type differentiation by positioning sensing elements at different locations along the probe length. Normal-state water droplets freeze at different positions compared to large water droplets due to their different thermal properties and masses. This spatial distribution of freezing points allows a single detector to distinguish between droplet types and accurately measure ice thickness by analyzing which sensing elements detect ice formation.
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 probe effectively differentiates between normal-state and large water droplets, improving the accuracy of icing detection and reducing errors in measuring ice thickness, enhancing flying safety by providing precise identification of icing conditions.
Implementation Method 1
The probe has a certain dimension in an air flow direction so that water droplets in the air flow having different median volumetric diameters form ice at different positions in the air flow direction
Implementation Method 2
water droplets in the air flow having different median volumetric diameters form ice at different positions in the air flow direction
Implementation Method 3
a stagnation area to trap and freeze large droplets
Data Source
Figure 1~2
Figure 3~4
AI summary
An icing detector probe includes three sections arranged sequentially along the direction of air flow, namely, a first section (I), a second section (II) and a third section (III). Wherein, the shape of the outer surface of the first section (I) is suitable for collecting droplets in the air flow; the shape of the outer surface of the second section (II) is suitable for full decelerating and releasing latent heat of large droplets during their movements; the outer surface of the third section (III) is suitable for icing of large droplets. The probe could distinguish and identify large droplets icing, thus effectively detecting it. Furthermore, it could effectively detect types of traditional icing, thus being helpful for exact detection of icing thickness. An icing detector including said icing detector probe is also provided.