Swirl Inducing Means for Fuel Ice Separation in Heat Exchangers
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Solution Overview
Problem
Gas turbine engines face issues with fuel system malfunctions due to ice accumulation, which can block passages and disrupt fuel supply, and existing heat exchanger solutions rely on bypass valves and limited ice tolerance of downstream components, leading to potential engine power loss.
Innovation Solution
A heat exchanger design that causes fuel to swirl before entering the heat exchange matrix, concentrating ice particles in specific areas and allowing ice-free or low-ice fuel to pass through, reducing the need for bypass valves and improving ice tolerance by melting ice on the heat exchanger surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bypass valve is provided to allow fuel to bypass the heat exchanger when ice blocks it, then the engine can continue to operate, but the fuel flow is no longer heated and ice accumulates in the heat exchanger inlet
Solution Approach 1:
The heat exchanger inlet volume is designed to accommodate expected transient quantities of ice before the bypass opens, and the swirl inducing means is activated beforehand to concentrate ice particles. This preliminary preparation ensures that when the bypass opens, only fuel with normal ice concentration passes to downstream components, maintaining both engine operation and fuel heating.
Solution Approach 2:
The heat exchanger is designed with different functional zones: the inlet region serves as an ice accumulation zone with sufficient volume, while the matrix region maintains heating function. The swirl inducing means creates localized ice concentration in specific areas, allowing other areas to remain ice-free and continue heating fuel effectively.
2Reliability
If the heat exchanger inlet volume is designed to accommodate transient ice quantities, then ice can be captured before bypass opens, but the device complexity increases
Solution Approach 1:
The swirl inducing means is integrated into the heat exchanger inlet structure, combining the ice separation function with the existing inlet design. This merging approach adds ice capture capability without requiring a completely separate device, thereby reducing the increase in device complexity while maintaining reliability.
3Reliability
If swirl inducing means is added to separate ice particles, then ice-free fuel can pass through the heat exchanger, but the device complexity increases
Solution Approach 1:
The swirl inducing means utilizes the existing fuel flow energy to generate centrifugal force for ice particle separation, without requiring external power sources or complex control systems. The fuel flow itself provides the energy needed for the separation process, making the system self-service and minimizing additional complexity.
4Reliability
If the bypass valve opens to allow unheated fuel to pass, then the heat exchanger can clear ice, but downstream components may malfunction due to high ice content
Solution Approach 1:
The swirl inducing means is activated before the bypass opens to concentrate ice particles in the inlet region. This preliminary action ensures that when the bypass opens, the fuel passing to downstream components has already been processed to have reduced ice content, preventing malfunction of downstream components while still allowing the heat exchanger to clear ice.
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 design enhances the engine's resistance to icing, ensures continuous fuel supply with reduced ice content, and extends the operating range by effectively managing ice accumulation within the heat exchanger, thereby improving safety and operational reliability.
Implementation Method 1
swirl inducing means arranged between said inlet and said matrix arranged to cause fuel from said inlet to swirl prior to entering said matrix
Implementation Method 2
a heat exchange matrix having heat transfer components past which the fuel flows between said inlet and said outlet and which are arranged to be heated
Implementation Method 3
allowing ice-free or low-ice fuel to pass through, reducing the need for bypass valves and improving ice tolerance by melting ice on the heat exchanger surfaces
Data Source
AI summary
A heat exchanger is provided for warming fuel prior to introduction of the fuel to an engine, the heat exchanger including: a fuel inlet and a fuel outlet; a heat exchange matrix having heat transfer components past which the fuel flows between said inlet and said outlet and which are arranged to be heated; and swirl inducing means arranged between said inlet and said matrix arranged to cause fuel from said inlet to swirl prior to entering said matrix. By causing the fuel to swirl prior to entering the heat exchange matrix, entrained ice in the fuel can be caused to concentrate at an outer region of the heat exchanger thereby allowing fuel to continue to flow through the heat exchanger to the engine even when ice is present in the fuel.