ACM Compressor Housing Local Wall Thickness Optimization
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Solution Overview
Problem
Air cycle machines face challenges in achieving a balance between withstanding high operating pressures and temperatures in aviation environments while minimizing weight, as conventional materials and designs often result in incompatible weights for certain installations.
Innovation Solution
The air cycle machine compressor housing features specific dimensions and structural elements, such as varying wall thicknesses, fillets, and weight-reducing pockets, which provide both strength and light weight properties, allowing it to operate effectively in aviation environments without excessive weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional materials and designs are used for the compressor housing, then the housing can withstand high operating pressures and temperatures, but the overall weight of the air cycle machine becomes incompatible with certain desired installations
Solution Approach 1:
The compressor housing employs varying wall thicknesses in different regions, with thicker walls at the bypass end portion and thinner walls elsewhere. This local quality variation allows the housing to withstand high pressures where needed while minimizing weight in less critical areas, resolving the contradiction between strength and weight.
Solution Approach 2:
The housing utilizes composite construction combining different materials with optimized properties for specific regions. The bypass passage incorporates a thick-walled section with specific material properties to handle high pressure, while other portions use lighter materials, achieving both strength requirements and weight reduction.
2Strength
If the bypass passage wall thickness is increased to withstand high pressures, then the housing strength improves, but the overall weight increases
Solution Approach 1:
The bypass passage wall thickness is specifically optimized at 0.330-inch to 0.390-inch only where structurally necessary to handle high pressures, while other portions of the housing use thinner walls. This localized thickening provides the required strength without proportionally increasing overall weight.
Solution Approach 2:
The wall thickness parameter is precisely controlled within a specific range (0.330-0.390-inch) for the bypass end portion, representing an optimized compromise between pressure withstand capability and weight minimization. This parameter optimization resolves the strength-weight contradiction.
Data Source
AI summary
An air cycle machine (ACM) compressor housing includes a body including an exterior surface and an interior portion. An inlet is integrally formed with the body. The inlet includes an inlet passage fluidically connected with the interior portion. An outlet is integrally formed with the body. The outlet includes an outlet passage fluidically connected with the interior portion. A bypass is integrally formed with the body. The bypass includes a bypass passage fluidically connected with the interior portion. The bypass passage includes a first end portion extending outwardly from the body, a second end portion and an intermediate portion extending therebetween. The first end portion includes a wall thickness of between about 0.330-inch (8.382-mm) and 0.390-inch (9.906-mm).