Ultrasonic Flow Meter Insert for Two-Phase Noise Reduction
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Solution Overview
Problem
Ultrasonic flow meters face challenges in accurately measuring two-phase fluid flows due to noise interference from liquids, as existing solutions like larger gaps or liquid drainage ports have limited success and do not effectively quantify the liquid fraction.
Innovation Solution
A flow meter design featuring an insert within the housing that separates the fluid into two pathways, allowing ultrasonic transducers to operate in a less noisy central passage with a higher gas volume fraction, while the annular passage handles a higher liquid fraction, and includes differential pressure sensors for improved measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic transducers are used to measure two-phase fluid flow, then flow measurement capability is provided, but measurement accuracy deteriorates due to noise interference from liquid accumulation around the transducer housing
Solution Approach 1:
The flow meter is divided into separate measurement and non-measurement zones using an insert. The insert creates a central measurement passage where ultrasonic transducers operate with minimal liquid interference, while liquid accumulates in the annular passage between the insert and housing. This segmentation isolates the transducers from harmful liquid accumulation, maintaining measurement accuracy in two-phase flow conditions.
2Object-affected harmful factors
If larger gaps are made around transducer housings or drainage ports are installed, then liquid accumulation is reduced, but the ability to quantify liquid fraction is lost and measurement reliability remains limited
Solution Approach 1:
Rather than using simple gaps or drainage ports, the invention implements a structured insert that segments the flow into distinct measurement and liquid-collection zones. This provides reliable liquid management while maintaining measurement capability.
Solution Approach 2:
Different regions of the flow meter are given different functions: the central passage is optimized for ultrasonic measurement with minimal liquid presence, while the annular passage is designed to collect and channel liquid away from transducers. This local differentiation of quality ensures both reliable measurement and effective liquid management.
3Measurement precision
If an insert is introduced to separate flow pathways, then measurement accuracy improves by reducing liquid interference, but device complexity increases
Solution Approach 1:
The insert segments the flow into two pathways: a central measurement passage for ultrasonic transducers and an annular passage for liquid collection. This segmentation improves measurement accuracy by isolating transducers from liquid interference.
Solution Approach 2:
The insert serves multiple functions simultaneously: it creates the measurement passage geometry, directs liquid flow away from transducers, defines the annular passage for liquid collection, and provides structural support for transducer mounting. This multi-functionality reduces the need for additional separate components, managing device complexity.
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 design enhances the accuracy of ultrasonic measurements by separating liquid and gas phases, reducing noise interference and allowing for precise quantification of fluid flow characteristics, including liquid fraction, in two-phase flow scenarios.
Implementation Method 1
a first ultrasonic transducer disposed within the housing and oriented to transmit an ultrasonic wave through a portion of the fluid flowing through the flow meter along the axis
Implementation Method 2
separating the fluid into a first portion flowing through a central passage defined by the insert and a second portion flowing through an annular passage between the insert and the housing
Data Source
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AI summary
A flow meter is shown. The flow meter includes a housing extending along an axis and defining an interior volume, the interior volume extending between an inlet port and an outlet port. The flow meter further includes an insert positioned within the interior volume and spaced apart from the housing, the insert extending along the axis. A first region between at least part of the insert and the housing along the axis defines a first flow pathway, and a second region within the insert and along the axis defines a second flow pathway.