Turbofan Rotating Blades Bypass Duct Blocking Mechanism
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Solution Overview
Problem
Existing turbofan systems rely on heavy reversal doors and complex drive mechanisms to redirect bypass flow, which are not optimal for weight reduction and efficiency.
Innovation Solution
A turbofan design featuring a set of rotating blades mounted on a slider that translates between advanced and retracted positions, using a simplified maneuvering system with a cam and transmission system to rotate blades and block the bypass duct, replacing traditional reversal doors for a lighter and more efficient airflow redirection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional reversal doors are used to redirect bypass flow, then effective airflow control is achieved, but the system mass increases and mechanism complexity increases
Solution Approach 1:
The bypass duct is divided into multiple sectors, each equipped with independent deflectors that can be individually activated. This segmentation allows only the necessary portions of the duct to be blocked or redirected at any given time, reducing the overall mass and complexity compared to using complete reversal doors that would block entire sections.
2Reliability
If traditional reversal doors with complex drive mechanisms are used, then airflow redirection is achieved, but device complexity increases
Solution Approach 1:
The deflectors are designed to be movable and adjustable rather than fixed, allowing them to dynamically change position based on operational requirements. This dynamic capability enables simple rotational movement to achieve complex airflow redirection patterns, reducing mechanism complexity while maintaining effectiveness.
Solution Approach 2:
The patent replaces complex mechanical reversal door systems with a simpler system of rotatable deflectors that use minimal mechanical components. The deflectors rotate on simple axes rather than requiring complex hinge mechanisms, door actuators, and linkage systems, thereby reducing overall device complexity.
3Power
If complete bypass duct blocking is implemented, then reverse thrust is maximized, but airflow control flexibility is reduced
Solution Approach 1:
The bypass duct is divided into multiple independent sectors with individual deflectors, allowing selective activation of only those sectors needed to achieve the desired reverse thrust level. This enables progressive or partial blocking rather than complete blocking, providing flexibility in controlling the magnitude and distribution of reverse thrust while maintaining the capability to maximize it when necessary.
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 design reduces mass and simplifies the mechanism for redirecting bypass flow, enhancing the turbofan's efficiency and reducing weight compared to traditional systems, while maintaining effective airflow control.
Implementation Method 1
a cam integral with the first blade of one of the groups and having a tooth, a groove, integral with the fixed structure, which receives the tooth and where, when the mobile assembly moves, the tooth follows the groove and rotates the first blade
Data Source
AI summary
A turbofan having a nacelle comprising a slider mobile in translation between an advanced and a retracted position to open a window between a duct and the exterior, a plurality of blades, each one mobile in rotation on the slider between a stowed and a deployed position, where the blades are split into groups, where each group comprises a first blade, and a maneuvering system moving each blade and comprising a cam integral with the first blade of one of the groups and having a tooth, a groove receiving the tooth, a first transmission system transmitting the movement of the first blade bearing the cam to a first blade of each other group, and, for each group, a second transmission system transmitting the movement of the blade that bears the cam or is moved by the first transmission system to each of the other blades of the group.