Cropped-Delta Gust Sensing Vane for Rapid Flow Angle Measurement
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Solution Overview
Problem
Conventional gust measuring devices exhibit low accuracy and high lag time during dynamic flow angle measurements at high angular accelerations, which is significant for applications requiring rapid responsiveness.
Innovation Solution
A gust sensing vane with a cropped-delta shape and a heating element, coupled to a rotary hub, designed to reduce time lag and noise characteristics, featuring a rounded leading edge and sharp or curved trailing edges, and optimized proportions and surface treatments for improved aerodynamics and de-icing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional delta-shaped vane is used for flow measurement, then the device structure is simple, but the measurement accuracy is low and lag time is high at high angular accelerations
Solution Approach 1:
The vane is divided into multiple sections with different cross-sectional shapes along its length. The forward portion has a triangular cross-section while the aft portion has a rectangular cross-section, allowing each section to contribute differently to the overall aerodynamic performance and measurement accuracy.
Solution Approach 2:
The vane employs an asymmetric cropped-delta shape with a rounded leading edge and sharp trailing edges, creating unequal flow patterns on opposite sides that enhance the alignment torque and improve responsiveness to flow angle changes.
Solution Approach 3:
The leading edge of the vane is rounded rather than sharp, which smooths the airflow transition and reduces turbulence. This curvature modification improves the aerodynamic characteristics and reduces measurement lag time.
2Force
If the vane cross-sectional area is increased to improve torque generation, then the responsiveness improves, but the device complexity and surface area exposed to icing conditions increases
Solution Approach 1:
The vane design optimizes the distribution of cross-sectional areas along its length, with the forward triangular portion providing the necessary torque generation while the aft rectangular portion maintains structural integrity without excessive complexity.
Solution Approach 2:
The heating element, which adds complexity to the structure, is used to counteract the harmful effect of icing conditions. The element prevents ice accumulation on the vane surface, maintaining measurement accuracy and responsiveness in cold environments.
3Reliability
If the vane operates in icing conditions, then the measurement capability is maintained, but the energy consumption increases due to heating requirements
Solution Approach 1:
The heating element is integrated directly into the vane structure, allowing the vane to self-protect against icing conditions without requiring external heating systems. The element activates only when needed, providing energy-efficient protection.
Solution Approach 2:
The heating element changes the thermal state of the vane surface, preventing ice accumulation by maintaining the surface temperature above freezing point. This parameter change ensures continuous operational reliability in cold environments.
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 solution achieves a significant reduction in time lag and noise characteristics, enhancing responsiveness and torque generation, allowing for accurate and rapid fluid flow direction measurements, even at high speeds and in icing conditions.
Implementation Method 1
The gust sensing vane may further comprise a heating element located within the aft portion and extending along at least a portion of a length of the gust sensing vane
Data Source
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AI summary
A vane (200) for dynamic flow angle measurements may have improved performance for time lag responsiveness over a prior art delta-shaped vane. In various embodiments, a gust sensing vane (200) may have a cropped-delta shape and configured to align to a fluid flow direction, where the gust sensing vane (200) comprises a forward portion (201) having a leading edge (202) and an aft portion (203) having a first trailing edge (204) and a second trailing edge (205). A cross-sectional area of the forward portion (201) may have a triangular shape. Furthermore, a cross-sectional area of the aft portion (203) has two substantially parallel sides to form the cropped-delta shape of the gust sensing vane (200). The gust sensing vane (200) may be coupled to, and extend away from, a rotary hub (206).