Aircraft Exhaust-Rotor Layout for Reducing Cruise Rotor Heating
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Solution Overview
Problem
Existing aircraft designs face issues where the cruise rotor is excessively heated by the heat of exhaust gas discharged from the exhaust outlet, leading to potential damage and inefficiencies.
Innovation Solution
The exhaust outlet and cruise rotor are positioned such that they do not overlap when viewed from the direction of exhaust gas discharge, with a cooling system using mixed cooling gas to prevent direct contact and a duct structure to guide airflow, preventing heat transfer to the cruise rotor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the cruise rotor is positioned rearward of the exhaust outlet to reduce overall length, then the aircraft length is reduced, but the cruise rotor is excessively heated by the heat of exhaust gas
Solution Approach 1:
The patent positions the cruise rotor and exhaust outlet in different lateral positions rather than only different longitudinal positions. The cruise rotor is arranged in a rearward and lateral position relative to the exhaust outlet, utilizing three-dimensional space to avoid direct alignment, thereby preventing exhaust gas from heating the rotor while maintaining compact aircraft length.
Solution Approach 2:
The patent introduces a duct as an intermediary structure between the exhaust outlet and the cruise rotor. The duct guides the exhaust gas flow away from the cruise rotor, acting as a mediator that allows the exhaust outlet and rotor to be in close proximity without direct thermal contact, thus solving the heating problem while maintaining compact design.
2Length of moving object
If the cruise rotor is positioned close to the exhaust outlet to reduce aircraft length, then the aircraft length is reduced, but the cruise rotor is excessively heated by the heat of exhaust gas
Solution Approach 1:
The patent positions the cruise rotor and exhaust outlet in different lateral positions rather than only different longitudinal positions. The cruise rotor is arranged in a rearward and lateral position relative to the exhaust outlet, utilizing three-dimensional space to avoid direct alignment, thereby preventing exhaust gas from heating the rotor while maintaining compact aircraft length.
Solution Approach 2:
The patent introduces a duct as an intermediary structure between the exhaust outlet and the cruise rotor. The duct guides the exhaust gas flow away from the cruise rotor, acting as a mediator that allows the exhaust outlet and rotor to be in close proximity without direct thermal contact, thus solving the heating problem while maintaining compact design.
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 arrangement effectively prevents the exhaust gas from contacting the cruise rotor, maintaining its functionality and efficiency while reducing heat transfer, thus providing a desirable aircraft configuration.
Implementation Method 1
an exhaust outlet provided at a tail part of the fuselage and configured to discharge exhaust gas from the engine to an exterior of the fuselage
Implementation Method 2
a cruise rotor positioned rearward of the exhaust outlet of the fuselage and configured to generate thrust in a horizontal direction on the fuselage
Data Source
AI summary
The aircraft includes a fuselage, an engine disposed in the fuselage, an exhaust outlet provided at a tail of the fuselage for discharging exhaust gas from the engine to the outside, and a cruise rotor positioned rearward of the exhaust outlet and generating horizontal thrust on the fuselage. The exhaust outlet and the cruise rotor do not overlap each other when viewed from the direction in which the exhaust gas is discharged.