Cabin Air Compressor Motor Cooling with Blower-Assisted Airflow
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Solution Overview
Problem
The performance of aircraft cabin air compressors is limited by the pressure drop from the compressor inlet to the ram air system, which restricts the cooling airflow and reduces the efficiency of the air-cooled electric motor driving the compressor.
Innovation Solution
A cabin air compressor assembly with a blower connected to the compressor and motor, which increases the pressure differential and mass flow of the cooling airflow across the motor, enhancing thermal energy removal and compressor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air-cooled electric motors are used to drive cabin air compressors, then the compressor can be cooled by ram air system flow, but the cooling airflow is restricted by pressure drop from compressor inlet to ram air system, reducing motor performance
Solution Approach 1:
The invention separates the cooling airflow path from the compressor intake path by providing dedicated cooling air inlets and outlets on the motor housing. This segmentation allows independent optimization of cooling airflow without being constrained by compressor inlet pressure conditions, thereby resolving the contradiction between adequate motor cooling and maintained compressor performance
Solution Approach 2:
The motor housing acts as an intermediary structure that directs cooling airflow through dedicated passages and channels. By incorporating internal cooling air passages and external cooling fins within the housing, the system mediates between the available ambient air and the motor cooling requirement, enabling effective heat dissipation while maintaining compressor inlet pressure
2Loss of energy
If cooling airflow is increased to improve motor cooling, then thermal energy removal is enhanced, but the pressure drop limitation restricts the mass flow of cooling air
Solution Approach 1:
The invention extends the cooling approach into the radial dimension by incorporating cooling fins on the motor housing exterior. This dimensional extension increases the heat dissipation surface area without requiring proportional increases in cooling air mass flow, thereby enhancing thermal energy removal efficiency while working within the pressure drop constraints
Solution Approach 2:
The system changes the cooling parameter from relying solely on high mass flow to utilizing increased surface area and improved heat transfer coefficients through finned structures. This parameter change allows effective cooling with limited mass flow by enhancing the heat transfer area and efficiency
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 increased cooling airflow improves the performance of the cabin air compressor and the overall environmental control system by enhancing thermal energy removal and increasing the pressure differential, thus overcoming the limitations imposed by the existing pressure drop.
Implementation Method 1
The cooling flow is directed across the cabin air compressor motor from the first end toward the second end thus removing thermal energy from the ram air fan motor via the cooling flow
Data Source
AI summary
A cabin air compressor assembly includes a cabin air compressor disposed at a compressor inlet and a cabin air compressor motor operably connected to the cabin air compressor. At least one cooling flow inlet is located at a first end of the cabin air compressor motor substantially opposite a second end whereat the cabin air compressor is located. The cooling flow inlet is configured to direct a cooling flow across the cabin air compressor motor. A blower is operably connected to the cabin air compressor and is configured to urge a cooling flow from across the cabin air compressor motor toward a cooling flow outlet, thereby increasing the cooling flow across the cabin air compressor motor.