Turbomachine Heat Management Fluid Refresh via Bypass Duct Hatch
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Solution Overview
Problem
Heat management systems in turbomachines face inefficiencies due to the limited cooling capacity of fluid streams after initial heat transfer operations, leading to increased temperatures and reduced pressures, which can necessitate larger bypass ducts and impact thrust generation, while existing systems struggle to effectively refresh heat management fluid for optimal performance.
Innovation Solution
The implementation of a heat management system that includes a first and second heat exchanger in series, with a hatch providing fluid communication between two ducts to introduce a cooler fluid stream, allowing for improved heat transfer and decoupling of thermal performance between heat exchangers, thereby refreshing the heated fluid stream with cooler air from another duct.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fluid stream is used in a first heat transfer operation, then heat transfer is achieved, but the cooling capacity is reduced in subsequent heat transfer operations
Solution Approach 1:
The system discards the warmed fluid stream from the first heat exchanger and recovers fresh cool fluid from the bypass duct to supply to the second heat exchanger, preventing the degradation of cooling capacity that would occur if the same fluid were reused
Solution Approach 2:
The cooling function is segmented into two separate fluid streams: one for the first heat exchanger and another fresh stream for the second heat exchanger, allowing each to operate at optimal cooling capacity independently
2Quantity of substance
If the bypass duct size is increased to maintain cooling capacity, then more pressurized fan air can flow through, but the weight and size of the turbomachine increase
Solution Approach 1:
Instead of increasing duct size to provide more cooling air, the system recovers and redirects existing bypass air that would otherwise be wasted, providing additional cooling capacity without requiring larger ducts or increased fan air flow
Solution Approach 2:
The hatch acts as an intermediary component that enables the transfer of bypass air to the second heat exchanger, providing a simple mechanism to access existing cooling resources without major structural modifications
3Temperature
If pressurized fan air from the bypass duct is used for cooling, then cooling is achieved, but the thrust generated by the turbomachine is reduced
Solution Approach 1:
The system extracts and utilizes bypass air that is already present in the system for cooling purposes, rather than diverting additional air that would impact thrust generation, thereby achieving cooling without compromising propulsion performance
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 enhances heat transfer efficiency by introducing cooler air to the second heat exchanger, improving the cooling capacity of the fluid stream and reducing the need for larger bypass ducts, thus maintaining performance while minimizing weight and size increases.
Implementation Method 1
a first heat exchanger configured and arranged to receive a first fluid stream from a first duct
Implementation Method 2
a second heat exchanger configured and arranged to receive the first fluid stream after discharging from the first heat exchanger
Implementation Method 3
a hatch configured to provide fluid communication from a second duct to the first duct so as to introduce a second fluid stream from the second duct to the first duct
Data Source
AI summary
A heat management system for a turbomachine may include a first heat exchanger configured and arranged to receive a first fluid stream from a first duct, a second heat exchanger configured and arranged to receive the first fluid stream after discharging from the first heat exchanger, and a second duct fluidly communicating with the first duct between the first heat exchanger and the second heat exchanger to introduce a second fluid stream from the second duct to the first duct. A method of cooling fluid streams may include directing a first fluid stream from a first duct across or through a first heat exchanger, directing the first fluid stream across or through a second heat exchanger after discharging from the first heat exchanger, and directing a second fluid stream from a second duct to the first duct, with the second duct fluidly communicating with the first duct between the first heat exchanger and the second heat exchanger.