Air Cleaner Outlet Pipe Flow Regulator for Stable Measurement
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Solution Overview
Problem
Airflow separation and deflection within the outlet pipe of air cleaners cause instability in airflow measurement, leading to variations in air quantity detection by the airflow meter.
Innovation Solution
The air cleaner incorporates flow-regulating members with a peaked shape and width-narrowing portions on the inner surface of the outlet pipe, positioned around the airflow meter, to generate orderly longitudinal vortices and suppress separation, ensuring a stable air stream into the airflow meter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an airflow meter is inserted into the outlet pipe to measure air quantity, then measurement capability is provided, but airflow separation and deflection occur causing measurement instability
Solution Approach 1:
A flow-regulating member is introduced as an intermediary element between the airflow meter and the outlet pipe wall. This member has a specific shape with a rounded upstream end and a downstream end that tapers toward the wall, designed to guide airflow smoothly around the airflow meter without causing separation or deflection, thereby maintaining measurement stability while preserving airflow reliability
Solution Approach 2:
The flow-regulating member is positioned locally at the insertion site of the airflow meter within the outlet pipe. Its shape and position are specifically tailored to address the local airflow disturbance caused by the airflow meter insertion, creating a localized flow guidance zone that prevents separation and deflection only where needed without affecting the entire pipe flow
2Measurement precision
If a flow-regulating member is added to suppress airflow separation, then measurement stability is improved, but device complexity increases
Solution Approach 1:
The flow-regulating member is integrated directly into the outlet pipe structure, merging the flow regulation function with the pipe wall itself. This integration approach eliminates the need for separate, complex flow control devices while achieving the desired airflow stabilization effect, thus improving measurement stability without proportionally increasing device complexity
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 configuration stabilizes airflow, reduces measurement errors, and improves engine output by maintaining uniform airflow and reducing pressure loss, while also simplifying manufacturing through the use of a two-part split mold.
Implementation Method 1
the first aspect enables orderly longitudinal vortices to be generated downstream of the flow-regulating members in the direction of flow
Data Source
AI summary
There is provided an air cleaner including: an outlet pipe through which air is discharged; an airflow meter that is inserted toward an interior of the outlet pipe through a wall of the outlet pipe; and a flow-regulating member that is formed projecting from an inner surface of the outlet pipe at a side of the airflow meter, the flow-regulating member including an edge that is formed with a peaked shape with respect to the inner surface and that runs along a direction of flow of air, a rear end that is formed at a downstream end of the edge in the direction of flow, and that is shaped cut sharply toward the inner surface and a width-narrowing portion that decreases in width in a circumferential direction of the outlet pipe on progression downstream in the direction of flow.