Bleed Air Cooling System for Gas Turbine Engine
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Solution Overview
Problem
Conventional cooling methods in gas turbine engines require large amounts of airflow to manage high temperatures in the turbine section, exceeding material limits and necessitating improved cooling air delivery.
Innovation Solution
A bleed air cooling system with strategically located bleed ports, a bleed duct, and safety sensors that allow for real-time monitoring and adaptive control of the bleed airflow, enabling selective source changes and modulation to ensure efficient cooling while preventing backflow and maintaining operational safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If large amounts of airflow are used for cooling the turbine section, then cooling effectiveness is improved, but system complexity and energy loss increase
Solution Approach 1:
The patent applies local quality by providing cooling air to specific high-temperature zones in the turbine section through strategically positioned bleed ports and ducting. Instead of cooling the entire turbine section uniformly, the system targets specific areas such as turbine vanes and buckets where temperatures exceed material limits, thereby reducing the total amount of cooling air required while maintaining effective temperature control in critical regions.
Solution Approach 2:
The patent uses bleed air from the compressor as an intermediary cooling medium. This bleed air is extracted from the compressor discharge, cooled in the bypass duct, and then delivered to the turbine section. This intermediary approach allows the system to transfer cooling capacity from a region of lower temperature (bypass duct) to a region of high temperature (turbine section), reducing the direct energy loss associated with using large amounts of high-pressure cooling air.
2Temperature
If high pressure cooling air is delivered to the turbine section, then cooling effectiveness is improved, but risk of backflow and operational anomalies increases
Solution Approach 1:
The patent incorporates safety sensors that monitor the bleed air cooling system for anomalies such as backflow conditions. The sensors detect pressure differentials and flow directions, providing feedback to the control system. When backflow is detected or anticipated, the system can adjust bleed port positioning or modulate airflow to prevent the anomaly, thereby maintaining reliability while still delivering effective cooling when conditions are normal.
Solution Approach 2:
The patent employs dynamically adjustable bleed ports that can change their positioning or opening characteristics based on operating conditions. This dynamic adjustment allows the system to optimize cooling air delivery while preventing backflow by adapting to changing pressure gradients and flow conditions in real-time, thereby maintaining both cooling effectiveness and operational safety.
3Productivity
If bleed ports are positioned to optimize cooling delivery, then cooling efficiency is improved, but risk of backflow and anomalies increases
Solution Approach 1:
The patent uses safety sensors to provide continuous monitoring of the bleed air system, detecting anomalies such as backflow conditions that may arise from suboptimal bleed port positioning. The feedback mechanism allows the control system to identify when a particular bleed port configuration is causing safety issues and to adjust the system accordingly, thereby maintaining cooling efficiency while preventing safety anomalies.
Solution Approach 2:
The patent implements dynamically controllable bleed ports that can adjust their positioning and flow characteristics in response to changing operating conditions. This dynamic capability allows the system to optimize cooling efficiency by positioning bleed ports for maximum effectiveness while simultaneously preventing backflow by adapting to pressure gradient changes, thus resolving the contradiction between cooling efficiency and safety.
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
Enhances cooling efficiency by optimizing airflow distribution and temperature management within the turbine section, reducing material stress and ensuring reliable engine operation by detecting and responding to anomalies in real-time.
Implementation Method 1
a bleed duct in fluid communication with the bleed port and the configured to convey the bleed airflow from the bleed port to the bleed outlet
Implementation Method 2
cooling air is often provided from the compressor to the turbine section to reduce component temperature in the turbine section
Implementation Method 3
The air from the downstream most end of the compressor section is at elevated temperatures, relative to air at other portions of the compressor section
Data Source
AI summary
A bleed air cooling system for a gas turbine engine includes one or more bleed ports located at one or more axial locations of the gas turbine engine to divert a bleed airflow from a gas turbine engine flowpath, a bleed outlet located at a cooling location of the gas turbine engine and a bleed duct in fluid communication with the bleed port and the configured to convey the bleed airflow from the bleed port to the bleed outlet. One or more safety sensors are configured to sense operational characteristics of the gas turbine engine, and a controller is operably connected to the one or more safety sensors and configured to evaluate the sensed operational characteristics for anomalies in operation of the bleed air cooling system.