Exhaust Nozzle Segmented Flow Path for Noise and Efficiency
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Solution Overview
Problem
Existing exhaust nozzle technologies for supersonic aircraft fail to effectively reduce noise during take-off and landing while maintaining propulsion efficiency at supersonic speeds without increasing complexity and size, leading to weight and manufacturing cost issues.
Innovation Solution
An exhaust nozzle with multiple main nozzle pieces and a coupling nozzle piece that can swing inward and outward to change the cross-sectional shape of the exhaust flow path, allowing for a notch-shaped projection in one state and a broader area in another, achieved through a simple and lightweight mechanism without increasing structure complexity or size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a movable portion is provided in the exhaust nozzle to alter the shape and cross-sectional area of the exhaust flow path, then noise during take-off and landing is reduced, but the structure complexity and size increase
Solution Approach 1:
The exhaust nozzle is divided into multiple separate nozzle pieces (first nozzle piece, second nozzle piece, third nozzle piece) that can independently move relative to each other. This segmentation allows the nozzle to change its cross-sectional shape by adjusting the positions of individual pieces, thereby reducing noise during take-off and landing without requiring a completely complex movable structure.
Solution Approach 2:
The exhaust nozzle incorporates movable portions that can dynamically alter the cross-sectional area and shape of the exhaust flow path. The nozzle pieces can shift positions to change from a smaller cross-sectional area configuration (for noise reduction during take-off/landing) to a larger cross-sectional area configuration (for propulsion efficiency during supersonic cruising).
2Productivity
If the cross-sectional area of the exhaust flow path is increased toward the rear end side, then propulsion efficiency at supersonic speeds is improved, but noise during take-off and landing increases
Solution Approach 1:
The exhaust nozzle dynamically adjusts its cross-sectional area by moving the nozzle pieces to different positions. During supersonic cruising, the nozzle pieces are positioned to create a larger cross-sectional area that improves propulsion efficiency. During take-off and landing, the nozzle pieces are repositioned to create a smaller cross-sectional area that reduces noise, thus adapting to different operational requirements.
Solution Approach 2:
The invention changes the geometric parameters of the exhaust flow path by altering the positions of the nozzle pieces. This allows the cross-sectional area to be varied between a smaller configuration (for noise reduction) and a larger configuration (for propulsion efficiency), optimizing performance across different flight conditions.
3Object-affected harmful factors
If a complex movable mechanism is provided to alter exhaust flow path shape, then both noise reduction and propulsion efficiency are achieved, but weight and manufacturing cost increase
Solution Approach 1:
By segmenting the nozzle into multiple movable pieces, the invention achieves noise reduction and propulsion efficiency improvements without requiring a single complex movable mechanism. Each nozzle piece can be independently controlled, simplifying the overall mechanism and reducing weight compared to a monolithic movable structure.
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
This design reduces noise during take-off and landing while improving propulsion efficiency at supersonic speeds by altering the cross-sectional shape of the exhaust flow path without increasing complexity or size, using a simple and lightweight mechanism.
Implementation Method 1
the coupling nozzle piece is coupled bendably to the main nozzle pieces on either side thereof; when the main nozzle pieces are swung inside the exhaust flow path, the coupling nozzle piece forms a projecting section inside the exhaust flow path
Data Source
AI summary
Provided is an exhaust nozzle and a method for changing an exhaust flowpath, whereby noise can be reduced by using a simple and light-weight mechanism without increasing the complexity and size of the structure of the exhaust nozzle, and furthermore, the efficiency during cruising at supersonic speeds can be improved. The rear end side of main nozzle pieces 110 of an exhaust nozzle 100 are provided swingably in an inward and outward direction of an exhaust flow path 101, about an open/close bend section 111 to the rear of an engine, coupling nozzle pieces 120 are coupled bendably to adjacent main nozzle pieces 110 on either side, and when the main nozzle pieces 110 are swung inside the exhaust flow path 101, the coupling nozzle pieces 120 form projecting sections 102 inside the exhaust flow path 101.