Turbomachine Airflow Sampling System for Corrosion Monitoring
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Solution Overview
Problem
Current methods for determining corrosion rates in turbomachine inlet systems are inadequate as they can cause flow distortion and risk of coupons becoming projectiles, leading to potential damage and inaccurate measurements.
Innovation Solution
A sampling system with a sampling unit that includes a flow straightener, balancer, and air amplifier to direct and filter the airstream over secured coupons without creating distortion waves, allowing for accurate corrosive measurement and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coupons are placed in the inlet channel to monitor corrosion rate, then corrosion monitoring capability is improved, but flow distortion waves are created that can damage turbomachine components
Solution Approach 1:
The sampling system extracts a portion of the inlet airstream through a sampling line to a separate sampling chamber, where coupons are exposed to the extracted air sample rather than being placed directly in the main inlet channel. This separation removes the coupons from the harmful flow path while maintaining corrosion monitoring capability.
Solution Approach 2:
A sampling line acts as an intermediary conduit, transferring a portion of the inlet airstream from the main flow path to the sampling chamber. This intermediary allows coupon exposure to corrosive air without interrupting or distorting the main inlet flow that enters the compressor.
2Measurement precision
If coupons are placed in the inlet system to determine corrosion rate, then corrosion data is obtained, but coupons may corrode and dislodge becoming projectiles that cause damage
Solution Approach 1:
The sampling system extracts a portion of the inlet airstream through a sampling line to a separate sampling chamber, where coupons are exposed to the extracted air sample rather than being placed directly in the main inlet channel. This separation removes the coupons from the harmful flow path while maintaining corrosion monitoring capability.
Solution Approach 2:
The sampling chamber provides a contained environment that prevents corroded coupons from becoming projectiles in the main inlet system. The chamber design includes features to contain and safely manage coupon failure without allowing debris to enter the compressor.
3Measurement precision
If a sampling system is introduced to measure corrosives accurately, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The sampling system is divided into distinct functional modules: a sampling line to extract air, a sampling chamber to hold coupons, a flow straightener to condition the extracted air flow, and a flow balancer to regulate flow distribution. This segmentation allows each component to perform its specific function efficiently while maintaining overall system manageability.
Solution Approach 2:
The sampling chamber serves multiple functions: it contains the coupons for corrosion exposure, conditions the airflow through the flow straightener, balances flow distribution via the flow balancer, and provides a contained environment for safe coupon deployment. This multi-functionality reduces the need for separate systems for each task.
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 accurate monitoring of corrosives in the airstream without causing flow distortion or risk of damage, providing reliable data for maintenance scheduling and reducing the risk of coupon-related hazards.
Implementation Method 1
flow straightener for directing the airstream to flow over the at least one sampling coupon
Implementation Method 2
an air amplifier for assisting with moving the airstream through the sampling chamber
Implementation Method 3
a flow balancer for filtering foreign objects from the airstream
Data Source
AI summary
An embodiment of the present invention provides an air sampling system for measuring corrosives within an airstream flowing within an inlet system. This air sampling system may include an air sampling unit with a plurality of sampling coupons secured within. Parts of the air sampling system may be externally mounted to the inlet system, allowing for an operator to access the sampling coupons, while the inlet system operates. In operation, an embodiment of the present invention has a sampling line connected to the air sampling system; the airstream flowing within the sampling line passes over the sampling coupons and then returns to the inlet system.