Vertical Blade Louvers for Wind Turbine Rain and Noise Control
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Solution Overview
Problem
Modern wind turbines face challenges in air inlet and outlet design, including unsuitable pressure drop for air flow, rain ingress, and noise issues due to air passages, which affect the functioning and noise levels of nacelle components.
Innovation Solution
The design of compact louvers with vertical blades featuring rain prevention and acoustic absorption elements, including concave and convex blade sides with receptacles for acoustic absorber material, minimizes rain ingress and noise while maintaining air flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If air inlets and outlets are designed to provide suitable air flow, then air flow speed is improved, but rain ingress increases
Solution Approach 1:
The louver is segmented into multiple vertical blades that divide the air passage into multiple channels. This segmentation allows air to flow through while rain droplets are blocked by the blade structures and directed along the blade surfaces to the bottom plate, preventing rain ingress while maintaining air flow speed.
Solution Approach 2:
The vertical blades act as intermediary elements between the air flow and rain droplets. The blades intercept rain droplets from the air stream and guide them along their surfaces to the bottom plate, where they are collected and prevented from entering the protected space, while allowing air to pass through the inter-blade spaces.
2Speed
If air inlets and outlets are designed to provide suitable air flow, then air flow speed is improved, but noise level increases
Solution Approach 1:
The louver structure employs porous acoustic absorber material within the blade assemblies. This porous material absorbs noise generated by air flow through the louver while allowing air to pass through, thereby reducing noise levels without compromising air flow speed.
3Object-affected harmful factors
If rain prevention features are added to the louver, then rain ingress is minimized, but device complexity increases
Solution Approach 1:
The rain prevention features are merged with the vertical blade structure itself. The blades are designed with specific geometries that serve both as air passage dividers and as rain droplet interceptors and guides. The bottom plate integrates rain collection and drainage functions, combining multiple functions into a unified structure that minimizes 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
The louvers effectively reduce rain ingress and noise levels within the nacelle while maintaining low pressure drop, enabling efficient air intake and exhaust, and can be adapted for various applications beyond wind turbines.
Implementation Method 1
The louver further comprises acoustic absorber material in the inner and outer receptacles
Implementation Method 2
a plurality of vertical blades extending between the bottom plate and the top plate that have a profile in cross section which includes: at least a rain prevention feature
Data Source
AI summary
The present disclosure relates to louvers for enabling an air passage between an outside and an inside. More particularly, the present disclosure relates to louvers enabling said air passage while minimizing rain ingress towards an interior and minimizing noise produced in the interior. The present disclosure further relates to wind turbines including said louvers.