Ultrasonic Flow Meter Sensor Integration for Velocity Profile Accuracy
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Solution Overview
Problem
Ultrasonic flow meters experience systematic measurement errors due to disruptions in the spatial velocity distribution of the flowing medium caused by the placement of ultrasonic sensors within the measuring tube, leading to inaccuracies in flow rate determination.
Innovation Solution
The ultrasonic flow measuring device features a measuring tube with ultrasonic sensors aligned in stages along the inner wall, where the front edges of these stages run parallel to the central axis, minimizing disruptions in the spatial velocity distribution by maintaining equal cross-sectional areas of the flowing medium, thus reducing measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ultrasonic sensors are positioned in recesses in the inner wall of the measuring tube, then the sensors can be integrated into the measuring tube structure, but the recesses create disturbances in the spatial velocity distribution of the flowing medium leading to systematic measurement errors
Solution Approach 1:
The ultrasonic sensors are extracted from the inner wall recesses and mounted on the outer circumference of the measuring tube. This relocation eliminates the disturbance to the spatial velocity distribution of the flowing medium while maintaining the sensor's ability to measure flow velocity through the tube wall
Solution Approach 2:
The tube wall itself serves as an intermediary medium, allowing ultrasonic waves to pass through it from external sensors to the flowing medium inside. This enables sensor placement outside the tube while maintaining measurement capability, thus avoiding flow disturbance
2Stability of the object's composition
If grids with meshes are provided at the inlet openings of the recesses, then the vortices are reduced and their frequency increased, but the device complexity increases and the measurement of spatial velocity distribution becomes more difficult
Solution Approach 1:
The flow conditioning elements (grids and meshes) are completely removed from the design. Instead of modifying the flow field with complex structures, the solution extracts the sensors from disturbing positions and places them where they do not interfere with flow patterns
Solution Approach 2:
Rather than trying to manage the harmful effect of flow disturbance with additional components, the invention converts the problem by positioning sensors in a location where the natural flow pattern is undisturbed, turning the tube wall into a beneficial intermediary
3Stability of the object's composition
If guide plates are provided in the bore of the measuring tube perpendicular to the ultrasonic window, then the formation of flow vortices is prevented, but the device complexity increases and the measurement of undisturbed flow velocity is compromised
Solution Approach 1:
Guide plates are completely extracted from the measuring tube bore. The solution places sensors on the outer circumference, eliminating the need for internal flow conditioning structures that would complicate the device and interfere with measurements
4Measurement precision
If multiple ultrasonic sensors are arranged in stages integrated into the inner tube wall, then the spatial velocity distribution can be measured at different heights, but the stages disrupt the flow of the medium through the measuring tube
Solution Approach 1:
Multiple sensors for measuring vertical velocity profiles are extracted from inner wall recesses and mounted on the outer circumference at different angular positions. This allows measurement of velocity distribution without creating flow disturbances, as the sensors do not protrude into the flow path
Solution Approach 2:
The measurement approach transitions from radial measurement through inner wall recesses to circumferential measurement from the outer surface. Sensors are arranged at different angular positions around the tube circumference, enabling vertical velocity profile measurement without disrupting axial flow
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
This configuration allows for accurate determination of flow velocities at different heights within the measuring tube, reducing systematic measurement errors and enabling precise flow rate calculations, especially in partially filled pipelines.
Implementation Method 1
at least one ultrasonic sensor (28) integrated into a tube wall (14) of the measuring tube (12)
Implementation Method 2
determine the velocity of the fluid, for example, according to the well-known Doppler principle
Implementation Method 3
according to the well-known Doppler principle or the principle of transit-time difference
Data Source
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AI summary
An ultrasonic flow measuring device (10) comprises a measuring tube (12) with a pipe wall (14) having a pipe cross-sectional area (16), and a plurality of ultrasonic sensors (28). According to the invention, the ultrasonic transducing and/or ultrasonic emitting elements of the ultrasonic sensors (28) are predominantly oriented in the vertical direction (58) and arranged in a plurality of steps (30) integrated in the pipe wall (14), wherein the leading edges (36) of the steps (30) extend parallel to a central axis (18) of the measuring tube (12) in a continuous axial region that comprises at least one axial dimension of the ultrasonic sensor (28) or ultrasonic sensors (28).A majority of the integrated steps (30) have, at least in the connected axial area, a surface part (38) projecting inwards from the raw cross-sectional area (16) and a surface part (40) projecting outwards from the raw cross-sectional area (16), the areas of which are essentially equal in magnitude.