Flow Conditioning Ring for Fluid Flow Meter Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluid flow meters face challenges in accuracy and flow measuring range, particularly at lower flow rates, due to turbulence and vortex shedding, which affect the rotor's performance and measurement precision.
Innovation Solution
Incorporating a flow conditioning ring upstream of the rotor to smooth and condition the fluid flow, combined with a neutrally buoyant and dynamically balanced rotor, and utilizing inductive sensors for improved measurement accuracy and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional flow meter design is used without a flow conditioning ring, then the device complexity is lower, but the measurement precision deteriorates due to turbulence and vortex shedding affecting the rotor performance
Solution Approach 1:
The flow conditioning ring is positioned upstream of the rotor to pre-condition the fluid flow before it reaches the rotor blades. This preliminary action smooths the flow and reduces turbulence and vortex shedding, thereby improving measurement precision without requiring complex post-processing or additional sensing mechanisms
Solution Approach 2:
The flow conditioning ring acts as an intermediary element between the fluid source and the rotor. It modifies the flow characteristics by reducing turbulence and vortex shedding, creating optimized flow conditions that improve rotor performance and measurement accuracy without directly complicating the core measurement mechanism
2Adaptability or versatility
If the flow measuring range is extended to include lower flow rates, then the adaptability improves, but the measurement precision deteriorates due to turbulence and vortex shedding at these lower rates
Solution Approach 1:
The flow conditioning ring pre-smooths the flow across the entire operating range, including lower flow rates. This preliminary flow conditioning ensures that even at reduced flow rates where turbulence and vortex shedding are more problematic, the rotor receives optimized flow conditions that maintain measurement precision across the extended range
Solution Approach 2:
The flow conditioning ring modifies the flow parameters (velocity profile, turbulence intensity, vortex shedding characteristics) to optimize conditions for rotor operation. By changing these flow parameters upstream, the system achieves improved measurement precision across a broader range of flow rates including lower rates that would otherwise be problematic
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 enhances the accuracy and operational range of fluid flow meters by optimizing flow conditions at the rotor blade, reducing thrust loading, and increasing the meter's lifespan through efficient power usage.
Implementation Method 1
The invention has particular relevance to precision measuring devices utilising inductive sensing of the rotor movement
Implementation Method 2
In a particularly preferred embodiment the rotor is buoyancy balanced
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A fluid flow meter, comprising: means for defining a fluid flow path; a rotor positioned in said fluid flow path; at least one inductive target on the shaft of said rotor; and a sensor assembly comprising at least one inductive sensor; wherein said sensor assembly is positioned adjacent said rotor shaft such that at least one sensor is positioned adjacent said at least one inductive target.