Variable Diffuser for Cabin Air Compressor
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Solution Overview
Problem
Traditional aircraft environmental control systems face inefficiencies in controlling cabin air pressure, particularly in more electric aircraft, where variable speed compressors struggle to optimize airflow between maximum and minimum flow positions effectively.
Innovation Solution
A variable diffuser system for a rotating machine, featuring a drive ring and diffuser vanes that pivot between maximum and minimum flow positions, utilizing a compact diffuser actuator with a linkage mechanism to achieve mechanical advantage and efficient airflow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a variable speed compressor is used to control cabin air pressure, then the system can adapt to different operating conditions, but the ability to optimize airflow between maximum and minimum flow positions deteriorates
Solution Approach 1:
The diffuser vanes are made dynamically adjustable through a drive ring mechanism that can pivot the vanes between maximum and minimum flow positions. This dynamic adjustment allows the system to optimize airflow characteristics while adapting to different operating conditions, resolving the contradiction between adaptability and productivity.
2Ease of operation
If a variable diffuser with pivoting diffuser vanes is implemented, then airflow control is improved, but the device complexity increases
Solution Approach 1:
Multiple diffuser vanes are merged into a unified structure where they are collectively pivoted by a single drive ring. This combining approach allows airflow control to be achieved while reducing the number of independent actuators needed, thereby managing device complexity.
Solution Approach 2:
The drive ring serves multiple functions: it pivots all diffuser vanes simultaneously, provides mechanical advantage through its rotational motion, and enables both maximum and minimum flow positions. This multi-functionality reduces the need for separate mechanisms for each function, managing overall system complexity.
3Weight of moving object
If a compact diffuser actuator with linkage mechanism is used, then the system weight is reduced, but the mechanical advantage for actuation decreases
Solution Approach 1:
The drive ring utilizes rotational motion along a curved path to generate mechanical advantage. The circular geometry of the drive ring allows it to convert rotational movement into effective pivoting force on the diffuser vanes, providing sufficient mechanical advantage while maintaining a compact, lightweight actuator 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
The solution enables efficient control of airflow in cabin air compressors, allowing for a lightweight and compact system that optimizes airflow between extreme positions, reducing the power requirements for diffuser actuation and enhancing overall system performance.
Implementation Method 1
utilizing a compact diffuser actuator with a linkage mechanism to achieve mechanical advantage and efficient airflow control
Data Source
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Figure 5
AI summary
A variable diffuser (26) for a rotating machine (20) includes a multiple of diffuser vanes (34) mounted to a drive ring (36). The multiple of diffuser vanes (34) are movable in unison between a maximum flow position and a minimum flow position in response to rotation of a crank (44) to rotate the drive ring (36) about a centerline through a link arm (46).