Deployable Inlet Scoop for Ram Air Turbine
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Solution Overview
Problem
Inboard ram air turbines face challenges in efficiently deploying and managing airflow for optimal power generation due to fixed configurations that do not allow for dynamic adjustment of airflow based on power demand, leading to potential overspeed or overvoltage conditions.
Innovation Solution
A deployable inlet scoop system with a rigid door and flexible members on an aircraft fuselage that can move between stowed and deployed positions, regulated by an actuator and controller, to control airflow through the duct and mitigate overspeed or overvoltage conditions by varying the opening size based on sensor inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed configuration inlet scoop is used, then the device complexity is reduced, but the ability to dynamically adjust airflow and prevent overspeed conditions deteriorates
Solution Approach 1:
The inlet scoop is designed as a movable component that can dynamically adjust its position between stowed and deployed configurations. This dynamic capability allows the system to adapt airflow intake to match varying power generation demands, preventing overspeed conditions while maintaining operational reliability.
2Productivity
If the inlet scoop is always in deployed position, then maximum airflow and power generation are achieved, but overspeed and overvoltage conditions occur during low power demand
Solution Approach 1:
The system employs a controllable inlet scoop that transitions between stowed and deployed positions based on real-time power generation demands. This dynamic adjustment ensures optimal airflow intake is provided only when needed, maximizing productivity during high demand while preventing harmful overspeed and overvoltage conditions during low demand periods.
Solution Approach 2:
The inlet scoop system incorporates feedback control mechanisms that monitor power generation conditions and automatically adjust the scoop position accordingly. This feedback loop ensures the inlet scoop responds to changing operational requirements, maintaining safe operating parameters while optimizing power generation output.
3Reliability
If the inlet scoop is always in stowed position, then airflow is blocked and overspeed conditions are prevented, but power generation efficiency deteriorates
Solution Approach 1:
The inlet scoop system dynamically transitions between stowed and deployed positions based on operational requirements. During high power demand, the scoop deploys to maximize airflow and power generation. During low demand, it stows to prevent overspeed conditions. This dynamic behavior resolves the contradiction between protection and productivity.
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 system effectively manages airflow to prevent overspeed or overvoltage conditions, ensuring stable power generation by dynamically adjusting the inlet scoop position in response to power demand, thereby enhancing the operational reliability of inboard ram air turbines.
Implementation Method 1
A ram air turbine (RAT) is commonly an aircraft power device, which extracts energy from the air stream surrounding an aircraft in order to provide emergency or auxiliary electrical and/or hydraulic power
Implementation Method 2
The rotational motion of the turbine is then converted into electrical and/or hydraulic power
Data Source
AI summary
An aircraft includes a fuselage that has an exterior contour with an opening and a duct that is arranged interiorly of the exterior contour and extends from the opening. A ram air turbine is arranged within the duct. A deployable inlet scoop is mounted on the fuselage and is configured to be moveable between stowed and deployed positions. The stowed position blocks the opening into the duct and the deployed position exposes the opening and permits airflow through the duct. A method of providing electrical power includes identifying an electrical power demand condition, deploying an inlet scoop from an aircraft fuselage, and driving a ram air turbine with an airflow through the inlet scoop into the fuselage.