Flowmeter Protrusion for Vortex Separation
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Solution Overview
Problem
Flowmeters face measurement errors due to horizontal vortices that occur when target fluids flow backward, causing intake air to be misinterpreted as part of the flow rate, leading to inaccuracies in flow rate detection.
Innovation Solution
Incorporating a protrusion on the tip end surface of the flowmeter that extends between the inlet and outlet areas, increasing the distance between these regions and the point of vortex formation, thereby reducing the impact of horizontal vortices and improving measurement accuracy for both forward and backward fluid flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the flowmeter is designed without a protrusion, then the device complexity is reduced, but measurement precision deteriorates due to horizontal vortices causing intake air to be misinterpreted as part of the flow rate
Solution Approach 1:
The tip end surface of the housing is segmented into multiple areas (first end area, second end area, and intermediate area) with the protrusion located in the intermediate area. This segmentation allows the flowmeter to effectively separate intake air from the main flow path without requiring complete structural redesign, thus improving measurement precision while maintaining reasonable device complexity
Solution Approach 2:
The protrusion acts as an intermediary element between the first end area and the second end area of the tip end surface. It serves as a flow separation structure that prevents horizontal vortices from forming and being misinterpreted as intake air flow, thereby improving measurement accuracy without significantly complicating the overall housing structure
2Measurement precision
If the protrusion is positioned to maximize vortex separation, then measurement precision improves, but the device complexity increases due to additional structural requirements
Solution Approach 1:
The protrusion is strategically positioned only in the intermediate area of the tip end surface, rather than throughout the entire structure. This localized approach provides effective vortex separation and flow management at the critical location where horizontal vortices form, improving measurement precision while minimizing the increase in device complexity
Data Source
AI summary
A flowmeter is inserted into a main passage through which a target fluid flows. The flowmeter includes a housing, a sub passage, an inlet portion, an outlet portion, a flow rate detector, and a protrusion. The housing includes a side surface and a tip end surface. A part of the target fluid flows into the sub passage from the main passage. The target fluid flows into the sub passage through the inlet portion and flows out of the sub passage through the outlet portion. The flow rate detector is configured to detect a flow rate of the target fluid flowing through the sub passage. The tip end surface includes a first end area and a second end area. The protrusion protrudes from the tip end surface and is located in both the first end area and the second end area.