Radial Counter Flow Jet Cooling for Generator Rotor Hot Spots
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Solution Overview
Problem
The power output of large turbine-driven generators is limited by heat buildup in stator and rotor components, leading to insulation failure and hot spots, particularly around the centering pin, due to inadequate cooling.
Innovation Solution
A radial counter flow jet gas cooling system is implemented, featuring axial inlet ducts, radial outlet ducts, an axial subslot, and a radial counter flow duct that extends along the centering pin to efficiently distribute cooling gas and reduce hot spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a non-actively cooled centering pin is used in the rotor, then the device complexity is reduced, but hot spot temperatures increase leading to reduced power output
Solution Approach 1:
The cooling system is segmented into multiple independent ducts: axial inlet ducts for general rotor cooling, and a dedicated radial counter flow duct specifically for centering pin cooling. This segmentation allows targeted cooling of the centering pin without requiring a completely different cooling architecture, resolving the contradiction between simplicity and temperature control.
Solution Approach 2:
The cooling system provides local quality by directing cooling gas specifically to the centering pin region through the radial counter flow duct. This localized cooling approach addresses the hot spot problem at the centering pin without requiring active cooling throughout the entire rotor, maintaining relative simplicity while solving the specific temperature issue.
2Temperature
If additional cooling infrastructure is added to reduce hot spots, then temperature control improves, but device complexity increases
Solution Approach 1:
The radial counter flow duct serves multiple functions: it provides active cooling to the centering pin, creates a counter flow pattern that enhances overall cooling efficiency, and integrates with the existing axial inlet duct system. This multi-functionality allows improved temperature control without proportionally increasing system complexity.
Solution Approach 2:
The system uses pneumatic principles by utilizing gas flow through the radial counter flow duct to achieve active cooling of the centering pin. The counter flow pattern of the cooling gas creates efficient heat transfer without requiring mechanical moving parts or complex active cooling mechanisms, thus improving temperature control while limiting complexity increase.
3Productivity
If the rotor windings are utilized at higher capacity, then power output increases, but heat buildup accelerates leading to insulation failure
Solution Approach 1:
The cooling system ensures continuous cooling of the rotor components including the centering pin through the radial counter flow duct. This continuous cooling action allows the rotor windings to be utilized at higher capacity for extended periods without temperature accumulation that would lead to insulation failure, thus enabling sustained high power output.
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 cooling system effectively reduces temperatures around the centering pin, minimizing hot spots and enhancing the utilization of rotor windings, thereby increasing the overall power output of the generator.
Implementation Method 1
flowing cooling gas through a number of axial inlet ducts and a number of radial outlet ducts to cool a number of conductor bars
Implementation Method 2
flowing cooling gas through an axial subslot and a radial counter flow duct to cool a centering pin
Implementation Method 3
This generated heat should be dissipated to a cooling gas or other medium so as to avoid insulation failure and the like
Data Source
AI summary
The present application provides a radial counter flow jet gas cooling system for a rotor of a dynamoelectric machine. The radial counter flow jet gas cooling system may include a centering pin, a number of axial inlet ducts, a number of radial outlet ducts in communication with the axial inlet ducts, an axial subslot positioned about the axial inlet ducts, and a radial counter flow duct in communication with the axial subslot and extending along the centering pin.