Curved Flow Duct for Ram Outlet Header Pressure Drop
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Solution Overview
Problem
Aircraft environmental control systems face challenges in efficiently channeling air to the ram outlet header of a cabin air conditioning and temperature control system, particularly in managing pressure drops and maintaining structural integrity while minimizing weight and space constraints.
Innovation Solution
A flow duct with an annular band and a curved glove is designed to connect to the ram outlet header, featuring a U-shaped cross section that utilizes the header's side as a wall to enclose the flow path, reducing pressure drop and weight while maintaining structural integrity and fitting within limited spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a traditional flow duct design is used, then structural integrity is maintained, but pressure drop increases and weight increases
Solution Approach 1:
The flow duct employs curved surfaces and smooth transitions instead of sharp angles or flat surfaces. The curved geometry reduces flow separation and turbulence, minimizing pressure drop while using less material, thereby reducing weight.
Solution Approach 2:
The flow duct is divided into multiple sections with varying cross-sectional areas. This segmentation allows optimization of each section for specific flow conditions, reducing overall pressure drop while minimizing material usage in each segment.
2Volume of moving object
If a traditional flow duct design is used, then structural integrity is maintained, but available space decreases
Solution Approach 1:
Curved surfaces distribute stress more evenly throughout the structure compared to sharp corners or flat surfaces. This allows the flow duct to achieve required structural integrity with reduced wall thickness and smaller overall volume.
Solution Approach 2:
The flow duct utilizes thin-walled curved structures that leverage geometric strength rather than material thickness. The curved shell structure maintains structural integrity while minimizing material usage and overall volume.
3Weight of moving object
If the flow duct utilizes the header side as a wall, then weight is reduced and space is optimized, but manufacturing complexity increases
Solution Approach 1:
The flow duct is designed to integrate with the existing header structure, where the header side serves as part of the flow duct wall. This merging eliminates the need for separate manufacturing of that portion, reducing overall weight and space while leveraging existing manufacturing capabilities of the header.
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 solution effectively channels air to the ram outlet header, minimizing pressure drop and maintaining structural integrity with a lightweight design, enhancing the efficiency and performance of the aircraft's environmental control system.
Implementation Method 1
The glove has a curved shape that minimizes the pressure drop of the air flowing through the flow duct
Data Source
AI summary
A flow duct able to be connected to a ram outlet header includes a band having an annular shape and a glove connected to the band. The glove can include a first end that is annular in shape and connected to the band, a body that is curved and has a substantially U-shaped cross section with a first opening, and a second end that has a substantially U-shaped cross section and a second opening that is an extension of the first opening.