Fan Housing Airflow-Guiding Elements for Turbulent Flow Reduction
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Solution Overview
Problem
Conventional fan housings generate turbulent airflow and fail to effectively dissipate heat due to rotational inertia, leading to reduced fan blade speed and excessive noise, especially under high back pressure conditions.
Innovation Solution
The fan housing incorporates wing-shaped stationary blades with airflow-guiding elements extending along their circumference, which redirect and regulate airflow to prevent turbulence and noise, while also preventing foreign matter entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional fan blades rotate to generate airflow, then cooling function is provided, but turbulent flow is generated at the outlet due to rotational inertia causing excessive noise and reduced heat dissipation efficiency
Solution Approach 1:
The stationary blade is divided into multiple sections with different curvature radii along its length. The first section has a smaller curvature radius while the second section has a larger curvature radius, creating segmented flow guidance zones that progressively smooth the airflow and reduce turbulence at the outlet
Solution Approach 2:
The stationary blade is designed with a curved surface featuring varying curvature radii rather than a uniform curvature. This non-uniform curvature guides the airflow smoothly from the impeller toward the outlet, eliminating sudden flow directions and reducing turbulent flow generation
2Temperature
If stationary blades with uniform curvature are used, then manufacturing is simple, but airflow cannot be effectively guided causing poor heat dissipation performance
Solution Approach 1:
Different sections of the stationary blade are assigned different curvature characteristics tailored to their specific functions. The first section with smaller curvature radius optimizes airflow capture while the second section with larger curvature radius optimizes flow guidance, with each section's geometry optimized for its local role in the overall airflow management system
3Power
If fan blades operate under high back pressure, then cooling capacity increases, but turbulent flow is generated along the curved surface causing fan blade speed loss and excessive noise
Solution Approach 1:
The stationary blade is pre-designed with a curved surface featuring varying curvature radii that anticipates and prepares for high back pressure conditions. This pre-configured geometry guides airflow smoothly even when back pressure is high, preventing sudden flow separations and turbulence that would otherwise cause speed loss and noise
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 guides airflow to improve heat dissipation, reduce noise, and protect internal components by restraining turbulent flow and redirecting airflow towards the heat source.
Implementation Method 1
The side wall of the airflow-guiding element guides the airflow and changes the direction of the airflow
Implementation Method 2
the airflow-guiding element is capable of regulating the airflow, restraining the turbulent flow at the airflow outlet of the fan housing and on the curved surface of the stationary blade
Implementation Method 3
during rotation of fan blades 2, mounted in the fan housing 1
Implementation Method 4
turbulent flow is generated at the airflow outlet of the fan housing 1 due to rotational inertia
Data Source
AI summary
A fan housing and a fan have stationary blades for guiding airflow. Each stationary blade has at least one airflow-guiding element extending therefrom along the circumference of the fan. The side wall of the airflow-guiding element changes the direction of the airflow so that the airflow at the outlet is fully introduced toward the heat source. Furthermore, the airflow-guiding element regulates the airflow, restrains the turbulent flow at the outlet and on the curved surface of the stationary blade, decreases the noise arising from the turbulent flow, and prevents foreign matter from entering the fan housing so as to protect the inside elements thereof.