Aeronautical Probe Sinusoidal Leading Edge High Incidence Measurement
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Solution Overview
Problem
Aeronautical probes face challenges in accurately measuring total pressure, static pressure, and incidence, particularly at high incidences, due to boundary layer separation and the risk of blockage from moving parts, which affects the reliability and sensitivity of the measurements.
Innovation Solution
A profiled aeronautical probe with a sinusoidal leading edge and static pressure taps arranged symmetrically on either side, connected to static pressure chambers with water traps, is designed to prevent boundary layer separation and minimize blockage risks, using 3D printing for production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If moving multifunction probes are used to measure total pressure, static pressure and incidence, then measurement precision is improved, but reliability deteriorates due to blockage of moving parts
Solution Approach 1:
The patent replaces the mechanical rotating system with a fixed probe system that uses aerodynamic forces. Instead of mechanically rotating the probe to align with the flow, the fixed probe uses the natural flow direction to create differential pressures that indicate incidence angle, eliminating moving parts while maintaining measurement capability
Solution Approach 2:
The patent uses pneumatic principles by measuring incidence through pressure differences created by the flow field around the fixed probe. The incidence information is derived from aerodynamic pressure distribution rather than mechanical position sensing, using fluid dynamics to replace mechanical measurement
2Reliability
If fixed multifunction probes are used to eliminate moving parts, then reliability is improved, but measurement precision deteriorates at high incidence
Solution Approach 1:
The patent applies different geometric characteristics to different parts of the fixed probe. The probe body has specific cross-sectional shapes and surface features optimized for different flow conditions, allowing accurate pressure measurement across a wide incidence range while maintaining the fixed structure's reliability
Solution Approach 2:
The patent optimizes geometric parameters of the fixed probe such as cross-sectional area distribution, surface curvature, and tap locations to improve incidence measurement precision. By carefully selecting and adjusting these parameters, the probe achieves accurate measurements at high incidence angles without requiring mechanical movement
3Ease of manufacture
If conventional probe geometries are used, then ease of manufacture is improved, but measurement precision deteriorates due to boundary layer separation
Solution Approach 1:
The patent uses curved and rounded geometric features in the probe design, such as rounded leading edges and smooth transitions, to prevent boundary layer separation. These curved geometries promote attached flow and accurate pressure measurement while remaining compatible with standard manufacturing processes
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 achieves improved accuracy and stability in measuring incidence and static pressure, with reduced risk of blockage and enhanced performance at high incidences, allowing for monotonic and reliable incidence measurement without rotating moving parts.
Implementation Method 1
boundary layer separation and the risk of blockage
Implementation Method 2
prevent boundary layer separation
Data Source
AI summary
An aeronautical probe that presents a generally profiled shape, is provided with a fixing base and has undulations on at least part of its leading edge.