Heat Exchanger Fan Module Guide Vanes Against Airflow Stall
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Solution Overview
Problem
In transportation vehicle drives, existing fan modules face issues with air flow reversal and increased pressure loss due to limited design space and encapsulation, leading to stalling and inefficiency, especially at high air mass flows and in compact engine compartments.
Innovation Solution
The fan module incorporates a guiding device with guide vanes that impose a first vector component in the cross direction and a second vector component in the delivery direction, optimizing air flow orientation to reduce spin and prevent stalling, while allowing for efficient air delivery through heat exchangers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If fan modules are used in compact engine compartments with encapsulation, then space utilization is improved, but air flow reversal and pressure loss increase
Solution Approach 1:
The air flow guidance is segmented into multiple guide vanes arranged in sequence, each handling different portions of the air flow. This segmentation allows better control of the complex air flow patterns in compact spaces, preventing reversal and reducing pressure loss while maintaining effective cooling.
Solution Approach 2:
Guide vanes are introduced as intermediary elements between the fan wheel and the heat exchanger. These vanes mediate the air flow, redirecting it to prevent reversal against the fan wheel and reducing pressure losses, thereby resolving the contradiction between compact space utilization and energy loss.
2Productivity
If air mass flow is increased for effective cooling, then cooling performance is improved, but stalling and pressure loss increase
Solution Approach 1:
The guide vanes perform preliminary action by pre-orienting the air flow in the correct direction before it reaches the fan wheel. This preliminary guidance prevents stalling even at high air mass flows, allowing the system to maintain high cooling performance without compromising reliability.
Solution Approach 2:
The guide vanes change the flow parameters (direction and orientation) of the air stream. By modifying these parameters, the system can handle higher air mass flows for improved cooling performance while preventing stalling and maintaining reliable operation.
3Speed
If fan wheel rotates at high speed to deliver air, then air delivery capability is improved, but stalling and inefficiency increase
Solution Approach 1:
Guide vanes serve as intermediary elements between the rotating fan wheel and the heat exchanger. They mediate the interaction by properly orienting the air flow, which allows the fan wheel to rotate at high speeds without causing stalling, thus improving air delivery capability while maintaining reliability.
4Shape
If guide vanes orient air flow with greater cross direction component, then air flow orientation is improved, but delivery direction efficiency decreases
Solution Approach 1:
The air flow orientation is achieved through segmented guide vanes that progressively redirect the flow. The first vanes handle the cross-direction orientation while subsequent vanes restore the delivery direction, segmenting the orientation task to maintain both flow shape control and delivery efficiency.
Solution Approach 2:
The guide vanes utilize dimensional transformation by first redirecting air flow in the cross direction (first dimension) and then restoring it to the delivery direction (second dimension). This dimensional approach allows proper flow orientation without permanently sacrificing delivery 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
This solution enhances airflow orientation, reducing pressure losses and stalling effects, ensuring effective cooling and preventing damage to drive components by allowing for efficient heat dissipation in compact and encapsulated engine compartments.
Implementation Method 1
at least one of the guide vanes (22) imposes on the flow of the air (A) delivered by the respective fan wheel (10, 11) an orientation having a first vector component (V1) in the cross direction (CD) to the delivery direction (TD) and a second vector component (V2) in the delivery direction (TD)
Implementation Method 2
at least one fan wheel (10, 11) for delivering air (A) in a predetermined delivery direction (TD)
Data Source
AI summary
A fan module for a heat exchanger for a drive of a transportation vehicle. The fan module includes at least one of the guide vanes imposing on the flow of the air delivered by the respective fan wheel, an orientation having a first vector component in the cross direction to the delivery direction and a second vector component in the delivery direction, the first vector component being greater than the second vector component.