Breathable Fibrous Intake Duct Reduces Airflow Resistance
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Solution Overview
Problem
Conventional intake ducts with tubular curved portions experience air separation and increased airflow resistance due to eddy formation, leading to pressure loss and reduced cross-sectional airflow.
Innovation Solution
A tubular curved intake system component with an inner wall made of a breathable fibrous molded body, combined with high-compression and low-compression portions, reduces eddy generation and airflow resistance by allowing air suction through the inner wall while limiting it through the outer portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional hard plastic intake duct with a tubular curved portion is used, then the structural strength and durability are improved, but air separation occurs on the inner wall generating eddies that increase airflow resistance and pressure loss
Solution Approach 1:
The patent applies different breathability characteristics to different parts of the curved portion. The inner wall is made breathable to reduce eddy formation and airflow resistance, while the outer wall maintains lower breathability to preserve structural integrity and prevent excessive air permeation. This local differentiation resolves the contradiction between strength and airflow resistance.
Solution Approach 2:
The inner wall is constructed using a breathable fibrous molded body with controlled porosity. This porous structure allows air to pass through the wall, reducing the formation of eddies and separating airflow from the wall surface, thereby decreasing airflow resistance while maintaining sufficient structural strength.
2Object-generated harmful factors
If the inner wall is made of a breathable fibrous molded body, then airflow resistance is reduced by preventing air separation, but the structural strength may be compromised
Solution Approach 1:
The patent differentiates the breathability characteristics between the inner and outer walls. The inner wall uses high breathability to reduce airflow resistance, while the outer wall uses low breathability to maintain structural strength. This local quality differentiation allows each region to optimize for its specific function.
Solution Approach 2:
The patent employs composite material construction with the inner wall made of breathable fibrous molded body and the outer wall made of material with lower breathability. This composite structure combines the airflow benefits of breathable materials with the structural benefits of denser materials.
3Shape
If a tubular curved portion is designed to extend in a curved manner, then the airflow path is optimized for engine geometry, but eddies are generated on the inner wall reducing the cross-sectional area of the flow passage
Solution Approach 1:
The breathable fibrous molded body of the inner wall allows air to permeate through the wall surface, preventing the formation of boundary layer separation and eddies that would otherwise reduce the effective cross-sectional area of the flow passage.
Solution Approach 2:
The breathable inner wall acts as an intermediary between the curved geometry and the airflow. It mediates the interaction by allowing air to pass through the wall, thereby reducing the harmful effects of the curved geometry on airflow.
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 solution effectively reduces airflow resistance, decreases pressure loss, and enhances the cross-sectional area of the airflow passage, while also reducing noise and weight compared to traditional hard plastic designs.
Implementation Method 1
The inner wall is made of a breathable fibrous molded body
Data Source
AI summary
An intake system component for an internal combustion engine includes a tubular curved portion extending in a curved manner. The curved portion includes an inner wall located on an inner side of a curve relative to an inner passage. The inner wall is made of a breathable fibrous molded body. A part of the curved portion excluding the inner wall includes a portion having a lower breathability than the inner wall.