Contoured Inlet Manifold for Uniform Subfreezing Heat Exchanger Airflow
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Solution Overview
Problem
Environmental control systems face inefficiencies due to non-uniform airflow distribution and sub-freezing temperatures causing ice accumulation and blockages in heat exchangers, leading to reduced performance.
Innovation Solution
A contoured inlet manifold with a reservoir and offset flow path design that gradually increases cross-sectional area, diffusing airflow uniformly across the heat exchanger inlet, preventing ice accumulation and enhancing airflow distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high velocity airflow from turbine outlet is directed to heat exchanger inlet, then cooling efficiency is improved, but non-uniform distribution causes preferential flow to only portion of inlet face reducing heat exchanger performance
Solution Approach 1:
The inlet manifold introduces a lateral dimension to airflow distribution by creating a reservoir that spans across the width of the heat exchanger inlet. The contoured sidewalls extend in the lateral direction, forcing the airflow to distribute across the entire inlet face width rather than concentrating in a single location, thereby resolving the non-uniform distribution problem while maintaining high velocity cooling efficiency.
Solution Approach 2:
The inlet manifold changes the spatial parameters of airflow distribution through its contoured geometry. The sidewalls are shaped to gradually increase cross-sectional area and offset from the longitudinal axis, transforming the concentrated turbulent flow into a laterally distributed flow pattern that covers the entire heat exchanger inlet face, improving both uniformity and performance.
2Temperature
If sub-freezing airflow from turbine is used for cooling, then cooling capacity is improved, but ice or snow accumulates on inlet face blocking portions of heat exchanger
Solution Approach 1:
The inlet manifold performs preliminary action by distributing and diffusing the sub-freezing airflow before it reaches the heat exchanger inlet face. The contoured reservoir and sidewalls pre-condition the flow pattern, preventing ice accumulation by ensuring uniform distribution across the entire inlet face, which eliminates localized blockages and maintains reliable operation throughout the heat exchanger.
3Area of stationary object
If small area turbine exhaust is directed to large area heat exchanger inlet, then system compactness is improved, but airflow is non-uniformly distributed across inlet face
Solution Approach 1:
The inlet manifold resolves the area mismatch by introducing lateral dimensionality to the airflow path. The reservoir and contoured sidewalls expand the flow distribution in the lateral direction, allowing the small turbine exhaust area to effectively serve the entire large heat exchanger inlet area through three-dimensional flow management rather than simple planar expansion.
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 design ensures even airflow distribution, preventing blockages and improving the operational efficiency of heat exchangers by maintaining airflow uniformity and reducing ice formation.
Implementation Method 1
The intermediate portion is contoured such that the intermediate portion is offset from the longitudinal axis at the back side of the outlet portion... diffusing airflow uniformly across the heat exchanger inlet
Implementation Method 2
Such airflows may contain ice or snow created through the expansion cooling of air through the turbine, which can accumulate on, and may block portions of inlet face of a downstream heat exchanger... preventing ice accumulation and enhancing airflow distribution
Data Source
AI summary
A component for use in an environmental control system includes an inlet portion having a longitudinal axis, an inlet formed at the inlet portion, and an outlet portion including a front side and a back side. The front side is arranged closer to the inlet portion than the back side. An outlet is formed at the outlet portion and is arranged at a non-parallel angle relative to the inlet. An intermediate portion extends between and fluidly couples the inlet portion and the outlet portion. The intermediate portion includes a reservoir spaced laterally from the back side of the outlet portion and offset from the longitudinal axis of the inlet portion.