Gas Turbine Heat Exchanger Throttle Member Positioning
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Solution Overview
Problem
Conventional heat exchangers in gas turbine engines often disrupt thrust airflow and require significant packaging space due to complex transitions between round and rectangular sections, leading to flow distortion and reduced engine efficiency.
Innovation Solution
A heat exchange system with a non-circular throttle member, such as a polygonal frame with moveable louvers or vanes, is integrated into the gas turbine engine, allowing for controlled airflow and reducing the need for long duct transitions by positioning the throttle member downstream of the heat exchange structure, optimizing airflow and packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heat exchangers with large square or rectangular frontal areas are used, then specified operational characteristics are provided, but packaging area increases due to long duct transitions between round and rectangular sections
Solution Approach 1:
The patent inverts the conventional arrangement by placing the throttle member downstream of the heat exchanger rather than upstream. This eliminates the need for complex transitions between round and rectangular sections, as the throttle member can be positioned in a location where the duct cross-section is already matched to the heat exchanger outlet, thereby reducing packaging area while maintaining operational effectiveness
Solution Approach 2:
The patent changes the spatial arrangement by moving the throttle member to a different position in the flow path (downstream rather than upstream), effectively using the longitudinal dimension to resolve the packaging area issue. This dimensional repositioning eliminates the need for complex lateral transitions between different cross-sectional shapes
2Area of moving object
If conventional heat exchangers with long duct transitions between round and rectangular sections are used, then large frontal areas are achieved, but flow distortion increases leading to reduced engine operating efficiencies
Solution Approach 1:
By inverting the throttle member position to downstream, the patent eliminates the complex transitions that cause flow distortion. The airflow encounters the heat exchanger first in a properly configured duct, then passes through the throttle member in a region where the cross-sectional area is already matched, thereby maintaining flow uniformity and engine efficiency
3Ease of operation
If throttle members with circular shapes are used in round duct sections, then valve operation is simplified, but transitions to rectangular heat exchanger sections become long and complex
Solution Approach 1:
The patent resolves this contradiction by placing the circular throttle member downstream where the duct cross-section can be circular, while the heat exchanger maintains its rectangular shape. This eliminates the need for long transitions between different shapes, as each component operates in a duct section with its optimal cross-sectional geometry
Solution Approach 2:
The patent segments the duct system into distinct sections: a rectangular section for the heat exchanger and a circular section for the throttle member. By separating these components into different spatial zones along the flow path, the patent eliminates the need for complex transitions while allowing each component to operate with its optimal geometry
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 configuration minimizes flow distortion, reduces inlet pressure loss, and enhances heat exchanger performance by providing a more uniform inlet flow and compact design, improving engine efficiency and operational characteristics.
Implementation Method 1
A diffusing duct is associated with the upstream end... the diffusing duct includes a duct portion that increases in cross-sectional flow area from an upstream duct end to a downstream duct end
Implementation Method 2
Gas turbine engines include various thermal management systems that include heat exchangers and other associated flow control components that exchange heat generated by the gas turbine engine with bypass airflow
Implementation Method 3
A throttle member controls air flow through the heat exchange structure, wherein the throttle member: (a) has a non-circular cross section; and (b) is mounted to the downstream end of the heat exchange structure or is mounted between the upstream end and the diffusing duct
Data Source
AI summary
A gas turbine engine component includes a heat exchange structure having an upstream end and a downstream end. A diffusing duct is associated with the upstream end. A throttle member controls air flow through the heat exchange structure, wherein the throttle member: (a) has a non-circular cross section; and (b) is mounted to the downstream end of the heat exchange structure or is mounted between the upstream end and the diffusing duct.