Flow Detection Device Bypass Passage Turbulence Control
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Solution Overview
Problem
Conventional flow detection devices experience unstable output and insufficient accuracy due to non-smooth merging of airflow on the front and rear sides of the flow sensor, leading to inaccurate airflow detection.
Innovation Solution
Incorporating a flow deflection unit within the bypass passage to adjust the turning quantities of the airflow, ensuring that the first and second flows merge smoothly by using projections or steps on the inner and outer wall surfaces of the bent portion, aligning their turning quantities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the flow sensor is arranged in the bypass passage to detect airflow, then the flow detection function is achieved, but the airflow merging on the downstream side becomes unstable and detection accuracy deteriorates
Solution Approach 1:
The bent passage is designed in advance on the downstream side of the flow sensor to pre-establish a merging path for the divided airflow. This preliminary structural arrangement ensures that the first and second flows will merge smoothly after passing the sensor, preventing instability and maintaining detection accuracy.
Solution Approach 2:
A bent passage with curved geometry is introduced on the downstream side to guide the merging of divided airflow streams. The curved path allows the first and second flows to converge gradually rather than abruptly, reducing turbulence and stabilizing the airflow pattern for accurate sensor operation.
2Ease of operation
If the bypass passage receives part of the airflow to enable detection, then the flow measurement function is provided, but the merging of divided flows becomes rough and causes output instability
Solution Approach 1:
The bent passage structure is pre-configured in the bypass passage design to anticipate and prepare for the merging of divided airflow. This preliminary arrangement ensures stable airflow convergence before the air reaches the sensor again, eliminating output instability and ensuring reliable operation.
Solution Approach 2:
The curved bent passage provides a smooth transition path for the divided flows to merge. This curvature design allows the first and second flows to combine gradually, reducing turbulence and ensuring stable sensor output while maintaining ease of operation.
3Measurement precision
If the flow sensor divides the airflow into first and second flows, then the flow detection is enabled, but the merging process on the downstream side becomes unstable and reduces detection accuracy
Solution Approach 1:
The bent passage is incorporated into the bypass passage structure as a pre-designed feature that anticipates the need for smooth airflow merging. This preliminary structural element is integrated into the overall device design, enabling accurate flow measurement while managing the complexity through purposeful geometric design.
Solution Approach 2:
The bent passage introduces a curved geometric feature to the bypass structure, allowing the divided flows to merge smoothly. While this adds some structural complexity, it significantly improves measurement accuracy by ensuring stable airflow conditions at the sensor, justifying the increased device complexity.
Data Source
AI summary
A plate-like flow sensor is located in a bypass passage such that a front-to-rear direction of the flow sensor is substantially along a width direction of the bypass passage. The flow sensor divides a flow from its upstream into a first flow, which passes on its front side, and a second flow, which passes on its rear side. The bypass passage has a bent portion in which the first flow and the second flow merge on a downstream side of the flow sensor. A flow deflection unit changes a turning quantity of at least one of the first flow and the second flow such that a turning quantity of the first flow and a turning quantity of the second flow are substantially conformed in the bent portion.