Fuel Cell Separator Projections for Uniform Flow Distribution
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Solution Overview
Problem
Fuel cell separators with concavo-convex structures face challenges in achieving uniform fluid flow rate distribution due to the mutual restriction of shapes on opposed sides, leading to non-uniform flow rates in fluid flow paths.
Innovation Solution
The design incorporates center areas with linear convexes and adjacent flow distribution areas with projections of varying diameters to regulate fluid flow, increasing resistance in high-flow regions and reducing flow in low-flow regions, thereby achieving uniform flow rate distribution across the entire flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If concavo-convex structures are formed in mutually reversed relation on two opposed sides of the separator, then the separator can define flow paths for different fluids on respective sides, but the mutual restriction of shapes makes it difficult to solve non-uniform flow rate distribution
Solution Approach 1:
The patent applies local quality by varying the diameter of projections in different regions of the flow distribution area. Specifically, projections in regions corresponding to high flow rate sections have smaller diameters, while projections in low flow rate sections have larger diameters. This local variation in projection dimensions allows differential flow resistance to be introduced at specific locations, thereby correcting non-uniform flow rate distribution without changing the overall concavo-convex structure shape.
2Shape
If the separator structure is designed with fixed concavo-convex shapes on both sides, then structural symmetry is achieved, but flow rate distribution uniformity cannot be improved
Solution Approach 1:
The patent maintains structural symmetry at the macro level by preserving the overall concavo-convex shape configuration on both sides of the separator. However, at the micro level, it introduces local asymmetry by varying projection diameters within the flow distribution area based on regional flow rate characteristics. This hierarchical approach allows the separator to maintain structural symmetry while achieving flow rate uniformity through localized geometric modifications.
Solution Approach 2:
The patent resolves the contradiction by transitioning from two-dimensional shape consideration to three-dimensional dimensional variation. While the overall separator shape remains symmetric in plan view, the projections are given varying diameters in the radial dimension. This additional dimensional degree of freedom allows flow resistance to be modulated locally without compromising the structural symmetry visible from above.
3Ease of manufacture
If uniform projections are used in the flow distribution area, then manufacturing is simplified, but non-uniform flow rate distribution cannot be corrected
Solution Approach 1:
The patent implements local quality by categorizing the flow distribution area into multiple regions based on flow rate characteristics (high flow rate regions, low flow rate regions, and intermediate regions). Each region is assigned projections with specific diameter ranges: smaller diameters for high flow rate regions to increase resistance, larger diameters for low flow rate regions to reduce resistance, and intermediate diameters for intermediate regions. This regional differentiation strategy balances manufacturing feasibility with flow rate uniformity requirements.
Data Source
AI summary
In at least one of flow distribution areas 35 provided on a separator 15, plurality of first projections 46 formed in a region corresponding to a first section (parted regions 32a and 32c) of a center area (including parted regions 32a through 32c) having a relatively high flow rate of a first fluid (refrigerant) are designed to have a larger diameter of a cross section than plurality of first projections 46 formed in a region corresponding to a second section (parted region 32b) of the center area having a relatively low flow rate of the first fluid. This arrangement effectively attains a substantially uniform flow rate distribution of a fluid in a fluid flow path formed on a separator, which is configured to have concavo-convex structures formed in a mutually reversed relation on two opposed sides thereof.