Smart-Material Fan Inlet Control for Distortion and Flutter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gas turbine engines with shortened inlets experience inlet distortion and blade flutter due to insufficient space for air flow alignment, which can be exacerbated by crosswinds or different air streams with varying velocities or pressures.
Innovation Solution
Employing smart materials such as shape memory alloys, bi-metal materials, and graphene-based elements in fan casings, blades, and inlet cones that can be activated by electromagnetic waves to create serrations or active vortex generators, mitigating inlet distortion and blade flutter by altering airflow direction and creating turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If nacelles with shortened inlets are used to save size and weight, then the engine size and weight are reduced, but inlet distortion and blade flutter occur due to insufficient space for air flow alignment
Solution Approach 1:
The patent changes the physical parameters of the inlet structure by introducing adjustable geometry features (such as movable inlet guide vanes or deformable inlet lips) that can modify the inlet flow characteristics dynamically. This allows the shortened inlet to compensate for its reduced length by actively adjusting flow alignment, thereby maintaining reliable operation despite the size reduction.
Solution Approach 2:
The invention introduces dynamic elements into the inlet system, such as actively controllable inlet guide vanes or shape-memory alloy components that can change geometry in response to operating conditions. This dynamic adaptability enables the shortened inlet to maintain proper flow alignment across various flight conditions, resolving the contradiction between compact size and flow quality.
2Reliability
If smart materials are activated by electromagnetic waves to create serrations or vortex generators, then blade flutter and inlet distortion are mitigated, but device complexity increases
Solution Approach 1:
The patent employs smart materials (such as shape memory alloys or piezoelectric materials) that can autonomously respond to detected flow disturbances or vibrational conditions. These materials self-adjust their geometry or stiffness characteristics when activated by electromagnetic waves, eliminating the need for complex external control systems, sensors, and actuators. The system serves itself by directly converting electromagnetic energy into mechanical adjustments that mitigate blade flutter and inlet distortion.
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
Effectively reduces blade flutter and inlet distortion by dynamically adjusting engine components to maintain optimal airflow, thereby improving engine stability and performance.
Implementation Method 1
Employing smart materials such as shape memory alloys, bi-metal materials, and graphene-based elements in fan casings, blades, and inlet cones that can be activated by electromagnetic waves
Implementation Method 2
Employing smart materials such as shape memory alloys, bi-metal materials, and graphene-based elements in fan casings, blades, and inlet cones that can be activated by electromagnetic waves
Implementation Method 3
create serrations or active vortex generators, mitigating inlet distortion and blade flutter by altering airflow direction and creating turbulence
Data Source
AI summary
Systems, apparatus, articles of manufacture, and methods are disclosed to improve fan operability control using smart materials. An engine comprising an engine surface in an airflow path, a sensor positioned on the engine surface, and a smart-material-based feature positioned on the engine surface, the smart-material-based feature triggered to modify the airflow path when the sensor outputs an indication of a detected deviation from a reference value of an operating parameter of the engine.