Swirl Generator Deflecting Fin Segmentation
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Solution Overview
Problem
Conventional swirl generators fail to effectively isolate dust particles from high-speed air flows, leading to noise generation, erroneous engine operation, and reduced dust isolating performance due to air flow separation at joint portions of guide and deflecting fins, which also hampers swirl flow generation.
Innovation Solution
A swirl generator design featuring a central shaft body with guide vanes and deflecting fins, where each deflecting fin is composed of multiple portions with linear cross-sections along a cylindrical plane, connected at specific angles to minimize air flow separation and maintain efficient dust isolation, even at high air flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inner diameters of the intake ducts are increased to raise the air flow rate, then the engine output is improved, but air flow separation occurs at the joint portions of guide fins and deflecting fins, causing noise and reduced dust isolating performance
Solution Approach 1:
The deflecting fin is divided into multiple deflecting portions (first, second, third portions) with different inclination angles. This segmentation allows each portion to handle different aspects of the air flow, preventing flow separation while maintaining high air flow rates for improved engine output.
Solution Approach 2:
Different portions of the deflecting fin have different local properties (inclination angles). The first deflecting portion has a larger inclination angle to initially redirect the air flow, while the second and third portions have smaller angles to gradually adjust the flow without causing separation, ensuring reliable dust isolation throughout the entire fin structure.
2Object-affected harmful factors
If the angle between guide fin and deflecting fin is decreased to suppress air flow separation, then noise is reduced, but swirl forming performance of the deflecting fins deteriorates
Solution Approach 1:
The deflecting fin is segmented into multiple portions with progressively different inclination angles. This allows the structure to achieve both low noise (by avoiding flow separation) and high swirl forming performance (by maintaining adequate angle differences between guide fins and deflecting portions) simultaneously.
Solution Approach 2:
The deflecting fin structure transitions from a static, uniform angle design to a dynamic, multi-angle design where different portions respond differently to the air flow. This dynamic configuration optimizes both noise reduction and swirl generation across the entire fin structure.
3Productivity
If the inner diameters of the intake ducts are increased to raise the air flow rate, then the engine output is improved, but air flow separation causes erroneous operation of the air flowmeter and loss of engine output
Solution Approach 1:
By segmenting the deflecting fin into multiple portions with optimized inclination angles, the air flow remains attached to the fin surfaces even at high flow rates. This prevents flow separation that would cause erroneous air flowmeter readings, ensuring accurate measurement and proper engine control.
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 design effectively suppresses air flow separation, noise, and pulsation, ensuring efficient dust particle isolation and reduced pressure loss, while maintaining swirl flow generation and engine performance.
Implementation Method 1
The swirl generator 80 applies swirl force to air 84 that has been introduced into the inlet duct 85. The air 84 thus forms a swirl flow 82. In this state, dust particles contained in the air 84 receive centrifugal force and thus move from the center of the pre-cleaner 81 toward an inner wall of the duct 71.
Data Source
AI summary
A swirl generator is arranged in a duct through which air is sent from the exterior to an air cleaner. The swirl generator has a plurality of guide vanes, which change the flow direction of an air flow. Each of the guide vanes has a guide fin that adjusts the air flow and a deflecting fin that applies swirl force to the air flow. The deflecting fin is configured by an upstream portion and a downstream portion, which are connected together at a predetermined angle. The upstream portion and the downstream portion each have a cross section extending linearly along a cylindrical plane coaxial with a nose cone.