Aircraft Braking Force Generation Device with Cross Flow Fan
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Solution Overview
Problem
Current aircraft technologies face limitations in generating sufficient lift during low-speed flights and require additional braking force during ground runs, necessitating an enhancement in both lift and braking capabilities.
Innovation Solution
A braking force generation device comprising a cross flow fan, a deflector, and a blocker door, which can be retracted or deployed to form specific airflow paths, enhancing lift during takeoff and landing, and providing additional braking force during ground runs by reversing airflow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a high lift device is deployed to increase lift during low-speed flight, then lift is improved, but the device complexity increases
Solution Approach 1:
The patent combines the high lift function and braking force generation into a single integrated device. The cross flow fan, deflector, and blocker door work together to provide both lift enhancement during takeoff/landing and braking force during ground runs, eliminating the need for separate high lift devices and reducing overall system complexity.
Solution Approach 2:
The device performs multiple functions: it generates lift during low-speed flight by controlling airflow over the wing, and generates braking force during ground runs by reversing airflow direction. This multi-functionality allows a single device to replace what would traditionally require multiple separate systems.
2Force
If wheel brakes and air brakes are used to shorten ground run distance, then braking force is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the braking force generation function into the same device that provides high lift capability. The cross flow fan and associated control surfaces (deflector and blocker door) create a unified system that delivers both lift enhancement and braking force, reducing the number of separate braking systems needed.
Solution Approach 2:
The device serves dual purposes: enhancing lift during flight phases and providing braking force during ground operations. By making the high lift device also capable of generating braking force, the system eliminates the need for additional dedicated braking mechanisms.
3Force
If the deflector and blocker door are deployed to form a flow path for braking, then braking force is improved, but the device complexity increases
Solution Approach 1:
The deflector and blocker door are designed as movable components that can change position dynamically. The deflector can be raised or lowered relative to the wing, and the blocker door can rotate about its hinge, allowing the system to adapt its configuration for different operational modes (lift generation vs. braking force generation).
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 device improves lift generation during takeoff and landing while effectively shortening ground run distances by increasing braking force, thereby expanding airport usability and enhancing aircraft performance.
Implementation Method 1
a cross flow fan installed on a trailing edge side of the wing
Implementation Method 2
a deflector installed above the cross flow fan and capable of being retracted or separated with respect to the wing; and a blocker door installed below the cross flow fan
Data Source
AI summary
A braking force generation device is configured to have: a first mode in which a deflector and a blocker door are retracted with respect to a wing; a second mode in which, in a state where: (i) a leading edge of the deflector is separated from the wing; (ii) a trailing edge of the deflector is at or adjacent to the wing; and (iii) the blocker door is deployed: a first flow path is formed on a lower surface side of the deflector for fluid to flow from a rear of the wing to a front of the wing via a cross flow fan from an opening on a blocker door side to a leading edge opening on a leading edge side of the deflector in the first flow path; and a third mode in which a second flow path is formed on the lower surface side of the deflector.