Wet Gas Probe Cup Shield for Pressure Measurement
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Solution Overview
Problem
Conventional probes fail to accurately measure total pressure and temperature in wet gas conditions within centrifugal compressors due to liquid droplet deposition and aerodynamic interactions, leading to measurement errors and clogging, especially at high liquid mass percentages, with no miniaturized solutions available for such environments.
Innovation Solution
A miniaturized probe design featuring a cup-shaped shield with a nozzle to decelerate the gas flow, creating a pressure drop and sucking liquid droplets through holes, allowing for accurate total pressure and temperature measurements by isolating the gas phase within the cup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional probes are used to measure total pressure and temperature in wet gas conditions, then measurement capability is provided, but liquid droplet deposition on the probe surface causes measurement errors and clogging
Solution Approach 1:
The invention extracts and removes liquid droplets from the measurement zone by creating a separate liquid removal path through holes in the cup, allowing the gas phase to be measured independently without contamination from liquid deposition
Solution Approach 2:
The cup acts as an intermediary structure that separates the gas flow measurement function from the liquid droplet removal function, enabling accurate measurements by isolating the sensing elements from direct liquid contact
2Volume of moving object
If probe size is reduced to enable miniaturization for compressor use, then space requirements are met, but measurement accuracy and reliability become compromised
Solution Approach 1:
The probe is segmented into distinct functional zones: a cup structure for flow deceleration and liquid separation, holes for liquid removal, and a stem with sensing elements, allowing each component to perform its specific function efficiently in a compact form
Solution Approach 2:
The invention uses three-dimensional spatial arrangement within the cup structure to achieve flow deceleration and liquid separation without increasing overall probe length, enabling miniaturization while maintaining measurement capability
3Reliability
If separator devices are used to remove liquid from gas stream before compression, then liquid phase is separated, but considerable space and high cost are required
Solution Approach 1:
The invention extracts the liquid separation function from external separator devices and integrates it directly into the probe structure, eliminating the need for large external separators by performing liquid removal at the measurement point itself
Solution Approach 2:
The cup structure serves as an intermediary that performs both flow conditioning and liquid separation functions locally, replacing the need for external separator equipment while enabling reliable wet gas compression
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
Enables reliable and accurate measurements of total pressure and temperature inside centrifugal compressors operating in wet gas conditions, overcoming previous limitations of measurement errors and clogging, and facilitating performance evaluation in previously unmeasurable scenarios.
Implementation Method 1
means to accelerate the wet gas flowing around the cup whereby a pressure depression is created near said at least one hole to suck the liquid
Implementation Method 2
a pressure depression is created near said at least one hole to suck the liquid, that form a phase of the wet gas flow, from inside the cup
Implementation Method 3
allowing for accurate total pressure and temperature measurements by isolating the gas phase within the cup
Implementation Method 4
at least one tube or one thermal element positioned within the cup serving as pressure or temperature measuring device
Implementation Method 5
at least one tube or one thermal element positioned within the cup serving as pressure or temperature measuring device
Data Source
AI summary
A probe for the measurement of the total pressure or temperature of a two phase wet gas flow is also disclosed. Embodiments provide a stem, a tip on the top of the stem, a cup serving as a shield is formed in the tip, a at least one tube or thermal element positioned within the cup serving as a measuring device for the incoming wet gas flow; at least one hole which passes through at least one wall of the cup; and a pressure changing device configured to accelerate the wet gas flowing around the cup. A method and system for the measurement of the total pressure or temperature of a two phase wet gas flow is also disclosed.