Self-Modulating Valve for Anti-Icing Flow and Debris Clearing
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Solution Overview
Problem
Anti-icing systems for gas turbine engines face challenges in fluid flow management, particularly during startup and steady-state operations, as they require varying fluid amounts and risk debris accumulation due to intermittent use, leading to inefficiencies and frequent failures.
Innovation Solution
A self-modulating valve with an inner and outer shell that adjusts its passageway cross-sectional area in response to fluid pressure and temperature changes, coupled with a shut-off valve that vents debris when not in use, allowing for efficient fluid distribution and prevention of damage to external components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve maintains a fixed passageway cross-sectional area, then the structure is simple and reliable, but the fluid flow cannot be optimized for different operational conditions (startup vs. steady-state)
Solution Approach 1:
The valve incorporates an inner shell that can move axially relative to the outer shell, changing the passageway cross-sectional area from fixed to variable. This dynamic adjustment allows the valve to optimize fluid flow during different operational phases (startup with larger opening, steady-state with restricted opening) without requiring multiple valves or complex control systems.
Solution Approach 2:
The valve changes the physical parameter of passageway cross-sectional area in response to fluid pressure and temperature changes. The inner shell position is automatically adjusted based on these fluid condition changes, enabling the valve to adapt its flow characteristics to match the operational requirements of the gas turbine engine.
2Reliability
If the valve remains closed during intermittent use, then debris accumulation is prevented, but the valve may fail due to lack of lubrication and movement
Solution Approach 1:
The valve incorporates a debris clearing mechanism that allows fluid to continuously flow through the valve during startup conditions, even when anti-icing is not actively required. This continuous fluid action serves dual purposes: maintaining lubrication to prevent valve failure and flushing out accumulated debris, thereby extending valve life and reliability.
Solution Approach 2:
The valve uses the anti-icing fluid itself to clear debris from the passageway during normal operation. The fluid flow automatically performs the cleaning function without requiring external intervention or additional components, making the system self-maintaining during its operational cycle.
3Object-affected harmful factors
If hot high-pressure fluid is restricted during steady-state operations, then damage to external components is prevented, but fluid flow efficiency decreases
Solution Approach 1:
The valve creates different flow conditions at different operational phases by changing the passageway geometry. During startup, the passageway is more open to allow efficient fluid flow for debris clearing. During steady-state, the passageway is restricted to reduce the amount of hot high-pressure fluid reaching external components, preventing damage while maintaining adequate flow for anti-icing function.
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 self-modulating valve optimizes fluid flow during engine startup and steady-state operations, reducing debris accumulation and enhancing the efficiency and reliability of anti-icing systems by automatically adjusting fluid flow and clearing debris, thus preventing damage to vulnerable components.
Implementation Method 1
the inner shell is movable relative to the outer chamber between a first position and a second position by a change in fluid conditions of a fluid supplied to the fluid valve
Implementation Method 2
a change in fluid conditions of a fluid supplied to the fluid valve
Data Source
AI summary
A fluid valve is provided including an inner shell and an outer shell. The inner shell includes a sidewall having a first opening and an interior surface defining an inner chamber. The outer shell includes a sidewall having a second opening and an exterior surface defining an outer chamber. The inner shell is positioned within the outer shell and the inner shell is movable relative to the outer chamber between a first position and a second position by a change in fluid conditions of a fluid supplied to the fluid valve. The first opening and the second opening overlap to define a passageway extending from the interior surface of the inner shell to the exterior surface of the outer shell. Relative movement of the inner shell from the first position toward the second position reduces a cross-sectional area of the passageway.