Elliptical Fluid Intake Duct for Reduced Head Loss
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Solution Overview
Problem
Conventional fluid intake systems for vehicles, such as airplanes, experience insufficient cooling due to turbulent fluid flow in the ducts, leading to high head losses and the need for overdimensioning, which compromises aerodynamic performance.
Innovation Solution
The fluid intake system incorporates an elliptical outlet orifice with a major-to-minor diameter ratio greater than 1.5 and a diffuser section with an increasing area along the duct's neutral axis, reducing turbulence and enhancing fluid diffusion, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional rectangular duct is used, then the duct structure is simple and easy to manufacture, but the fluid flow becomes strongly turbulent causing large head losses and insufficient cooling
Solution Approach 1:
The patent applies curvature by replacing the rectangular duct cross-section with an elliptical cross-section. This curved geometry eliminates the sharp corners present in rectangular ducts, which are known to generate turbulence. The elliptical shape provides smooth flow transitions throughout the duct, reducing turbulent eddies and head losses while maintaining a relatively simple manufacturing process.
Solution Approach 2:
The patent changes the geometric parameters of the duct cross-section from a square/rectangular shape to an elliptical shape with a specific aspect ratio (major axis to minor axis ratio between 1.5 and 3). This parameter change fundamentally alters the flow characteristics, reducing turbulence intensity and head losses while preserving the compactness and manufacturability of the duct system.
2Volume of moving object
If the duct is flattened to reduce space occupation, then the space requirement is reduced, but turbulence may increase at the outlet
Solution Approach 1:
The elliptical cross-section with a controlled aspect ratio (1.5 to 3) provides a balanced solution. The flattening in one direction reduces the vertical space occupation within the vehicle wall, while the curved elliptical geometry maintains smooth flow characteristics. The specific aspect ratio range ensures that the outlet does not create excessive turbulence, achieving both compactness and flow stability.
3Temperature
If the outlet orifice has a large area to improve cooling, then the cooling effectiveness increases, but the duct size increases compromising aerodynamic performance
Solution Approach 1:
The patent optimizes the outlet orifice geometry by using an elliptical cross-section with a specific aspect ratio (1.5 to 3). This parameter optimization allows the outlet to provide sufficient cooling area while maintaining a compact overall duct size. The elliptical shape distributes the flow more efficiently, achieving effective cooling without requiring a larger duct that would compromise aerodynamic performance.
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 configuration ensures effective cooling by minimizing turbulence and reducing head losses by approximately 40%, allowing for efficient fluid distribution and improved aerodynamic performance.
Implementation Method 1
an elliptical shape for certain orifices—and at least for the first outlet orifice—advantageously facilitates uniform diffusion of the fluid stream by avoiding the formation of turbulence in the vicinity of the walls of the duct
Implementation Method 2
the elliptical shape of the section of one or more outlet orifices performs a major and specific role in the behavior of the fluid conveyed by the intake system
Data Source
AI summary
A fluid intake system including a fluid collector scoop designed to be fastened on an inside surface of a wall in order to collect the fluid flowing on the outside of the wall; and an extraction duct suitable for directing the fluid from an inlet orifice into the duct to at least one outlet orifice from the duct, is provided. The scoop is arranged so as to direct the collected fluid towards the inlet orifice of the extraction duct. In this system, at least one outlet orifice is of substantially elliptical section with a ratio of the major diameter of the ellipse over its minor diameter being greater than 1.5.