Variable Engine Intake Droop Control for Crosswind Airflow Stability
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Solution Overview
Problem
Turbine engines face performance reduction due to air stream separation from the engine intake caused by wind conditions such as crosswind and wind shear, which can be exacerbated by minimizing the axial length of the intake to reduce drag.
Innovation Solution
A variable engine intake system that adjusts the engine intake based on wind conditions using sensors to detect crosswind or wind shear, adjusting the pitch of fan blades, inlet guide vanes, intake length, or diameter to mitigate these conditions, maintaining a shorter intake length for reduced drag while preventing air flow detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the axial length of the engine intake is minimized to reduce drag, then drag is reduced and fuel efficiency is improved, but air stream separation from the engine intake is exacerbated under wind conditions
Solution Approach 1:
The engine intake system incorporates variable geometry components including adjustable inlet guide vanes and variable pitch fan blades that can dynamically adjust their configuration in response to detected wind conditions. This allows the intake system to adapt its aerodynamic characteristics in real-time, maintaining optimal airflow attachment while preserving the benefits of a compact axial length design.
Solution Approach 2:
The system changes operational parameters such as inlet guide vane angle and fan blade pitch in response to varying wind conditions. By adjusting these parameters, the system optimizes airflow characteristics to prevent separation while maintaining the reduced drag benefits of a shorter intake length.
2Length of moving object
If the engine intake is designed with a shorter axial length, then the overall engine size is reduced and drag is minimized, but the ability to maintain stable airflow under crosswind and wind shear conditions deteriorates
Solution Approach 1:
The intake system transitions from a static design to a dynamic system with actively controllable components. The adjustable inlet guide vanes and variable pitch fan blades enable real-time adaptation to maintain stable airflow patterns despite the reduced axial length, compensating for the loss of natural airflow stabilization that would otherwise be provided by a longer intake.
Solution Approach 2:
The system incorporates sensors to detect wind conditions and uses this information to adjust the configuration of inlet guide vanes and fan blades. This feedback mechanism allows the system to maintain stable airflow under varying external conditions while preserving the compact design benefits.
3Device complexity
If fixed geometry engine intake components are used, then the system is simpler and more reliable, but it cannot adapt to varying wind conditions such as crosswind and wind shear
Solution Approach 1:
The system replaces fixed geometry components with variable geometry components that can adjust their configuration. The inlet guide vanes and fan blades are designed with actuation mechanisms that allow them to change pitch or angle, enabling the system to adapt to different wind conditions while maintaining manageable complexity through standardized actuation systems.
Data Source
AI summary
A turbine engine including a fan having a plurality of fan blades, a nacelle that extends circumferentially about the fan, an engine intake including an engine inlet, and a variable engine intake system. The nacelle includes a fan cowl and an inlet cowl that is movable with respect to the fan cowl. The engine inlet is defined from a leading edge of the inlet cowl to the plurality of fan blades. The engine inlet defines a droop axis at the leading edge of the inlet cowl. The inlet cowl is tilted at a droop angle that is defined as an angle of the droop axis with respect to an axial plane of the turbine engine. The variable engine intake system adjusts the droop angle of the inlet cowl during operation of the turbine engine.