Airfoil Probe for Fluid Speed Measurement
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Solution Overview
Problem
Existing devices for measuring air speed in suction lines suffer from low measurement accuracy and risk of contamination, particularly in environments like mine ventilation where gases like methane are present.
Innovation Solution
A probe designed as a three-dimensional airfoil profile with measuring points on the front edge and side edges, minimizing vortex shedding and pressure fluctuations, ensuring high differential pressure measurements with reduced contamination risk and streamlined installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional probe design is used for measuring air speed, then the device can be installed in suction lines, but the measurement accuracy is low and contamination risk is high
Solution Approach 1:
The probe is designed with an airfoil profile featuring curved surfaces instead of sharp edges. The rounded leading edge and tapered trailing edge create streamlined geometry that reduces vortex formation and minimizes contamination risk while maintaining high measurement accuracy through optimized pressure differential detection
Solution Approach 2:
The invention transitions from conventional two-dimensional probe cross-sections to a three-dimensional airfoil profile with specific thickness ratios. This dimensional enhancement allows the probe to better integrate with the fluid flow while maintaining measurement precision and reducing turbulence-induced contamination
2Measurement precision
If a Prandtl tube is used for dynamic pressure measurement, then the device structure is simple, but the pressure difference is not pronounced resulting in compromised measurement accuracy
Solution Approach 1:
The airfoil profile incorporates optimized geometric parameters including a thickness ratio of 0.3 to 0.5 and specific curvature radii at the leading and trailing edges. These parameter optimizations maximize the pressure differential between the leading and trailing edges, significantly improving measurement accuracy while maintaining a relatively simple probe structure
3Measurement precision
If a probe with large dimensions is used to achieve adequate measurement, then measurement accuracy may improve, but the design effort and installation complexity increase considerably
Solution Approach 1:
By optimizing the airfoil profile parameters including thickness ratio, curvature radii, and length-to-diameter ratio, the invention achieves high measurement accuracy with a compact probe design. The optimized geometry maximizes pressure differential per unit length, reducing the required probe size while maintaining or improving measurement precision and simplifying installation
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 significantly enhances measurement accuracy and prevents contamination, allowing precise air speed determination in suction lines with minimal fluid disruption and probe influence, even in turbulent flows.
Implementation Method 1
a probe (3) which has at least two measuring points (4, 5) for measuring the differential pressure
Data Source
Figure 1
Figure 2
AI summary
The meter to measure the flow speed of a fluid, especially air in the suction channel of a mine ventilation system, has a probe (3) with at least two measurement points (4,5) for measurement of the different pressures. The probe has the shape of a spatial carrier surface profile with one measurement point at the leading edge (11) and the other at a side flank (12). The measurement points have entry openings into channels (6,7) to pressure sensors (8,9).