Aircraft ACM Diffuser Plate Layout for Low Pressure Loss
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Solution Overview
Problem
Conventional air cycle machine (ACM) and diffuser heat exchanger interfaces require significant packaging space due to complex interactions between air and liquid subsystems, leading to inefficiencies in flow distribution and pressure losses.
Innovation Solution
The ACM is mounted adjacent to a heat exchanger through a diffuser plate that receives airflow radially outward and around the plate, minimizing pressure loss and optimizing flow distribution into the air-liquid heat exchanger, thereby reducing packaging space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional diffuser with gradual transitions is used to minimize pressure losses, then flow distribution is improved, but packaging space increases significantly
Solution Approach 1:
The diffuser is segmented into a diffuser plate with multiple discrete flow paths radiating from the central turbine outlet. This segmentation allows the flow to be distributed through multiple channels rather than requiring a single large gradual transition, reducing the overall packaging space while maintaining effective flow distribution.
Solution Approach 2:
The diffuser plate uses a radial configuration where airflow transitions from the circular turbine exit to rectilinear heat exchanger inlet through multiple radial flow paths. This dimensional arrangement optimizes space utilization by distributing flow in a radial pattern rather than requiring linear gradual transitions, reducing packaging space while maintaining flow effectiveness.
2Loss of energy
If the diffuser plate outer periphery is shaped to optimize flow distribution, then pressure loss is minimized, but manufacturing complexity increases
Solution Approach 1:
The diffuser plate features a specifically shaped outer periphery with optimized geometry at the flow distribution region. This local quality optimization focuses the complex shaping only where it is most needed for flow distribution, rather than requiring complex geometry throughout the entire component, thus minimizing pressure loss while maintaining manufacturability.
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 significantly reduces packaging space while maintaining effective flow distribution and minimizing pressure losses, enhancing the efficiency of the environmental control system.
Implementation Method 1
The diffuser plate receives airflow from the ACM which strikes the diffuser plate and flows radially outward and around the diffuser plate and into the heat exchanger
Implementation Method 2
A diffuser plate outer periphery is shaped to assure minimal pressure loss and proper flow distribution into the air-liquid heat exchanger
Implementation Method 3
The ACM communicates airflow from the turbine to the liquid-to-air heat exchanger
Implementation Method 4
an air-to-air cycle cooling system which is in a heat exchange relationship with a liquid loop
Data Source
AI summary
An ECS system includes an ACM mounted adjacent an air-liquid heat exchanger through a diffuser that contains a diffuser plate. The diffuser plate receives airflow from the ACM which strikes the diffuser plate and flows radially outward and around the diffuser plate and into the air-liquid heat exchanger to provide minimal pressure loss and proper flow distribution into the air-liquid heat exchanger with significantly less packaging space.