Guide Vane Camber Variation for Reduced Flow Losses
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Solution Overview
Problem
Existing guide vanes in hydroelectric power systems fail to optimize flow conditions, leading to unsatisfactory efficiency due to limited design parameters and variations.
Innovation Solution
The guide vane design incorporates varying mean camber curve end angles along its axial extension, transitioning from positive to negative, creating a profiled strake that enhances flow management and minimizes losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional guide vanes with uniform design parameters are used, then the structure is simple and easy to manufacture, but the flow conditions are not optimized leading to unsatisfactory efficiency
Solution Approach 1:
The guide vane applies local quality by varying the mean camber curve end angle along the axial extension. Different axial positions have different camber angles, allowing the vane to optimize flow conditions at each location rather than using a uniform design throughout. This creates a profiled strake configuration that tailors the flow guidance to local requirements.
Solution Approach 2:
The invention changes geometric parameters along the axial extension of the guide vane. Specifically, the mean camber curve end angle is varied from positive values in one axial region to negative values in another axial region. This parameter variation creates multiple flow profiles that can be optimized for different flow conditions at different axial positions.
2Loss of energy
If the mean camber curve end angle is varied along axial extension, then flow conditions are improved and losses are reduced, but the manufacturing complexity increases
Solution Approach 1:
The continuous variation of the mean camber curve end angle along the axial extension creates an optimized flow path that reduces energy losses. The parameter changes from positive to negative angles are designed to control the flow direction and reduce turbulence or separation losses at different axial positions.
Solution Approach 2:
The profiled strake configuration introduces curved surfaces and varying camber angles along the axial extension. This curvature allows the guide vane to smoothly redirect flow at different angles along its length, improving flow conditions while maintaining a manufacturable form through controlled surface geometry.
3Productivity
If uniform flow profiles are used along the guide vane, then manufacturing is simplified, but flow optimization and efficiency are compromised
Solution Approach 1:
Each axial position of the guide vane has a locally optimized flow profile with a specific mean camber curve end angle. This allows the vane to address local flow conditions at different axial positions, improving overall power generation efficiency by optimizing flow guidance throughout the entire vane length rather than using a single uniform profile.
Solution Approach 2:
The guide vane incorporates dynamic characteristics through its varying geometry along the axial extension. The mean camber curve end angle changes continuously or in steps along the axis, creating a dynamic flow guidance system that adapts to different flow conditions at different axial positions, thereby improving overall system efficiency.
Data Source
AI summary
Guide vane for a guide wheel of a pump or turbine having a guide vane body with two end faces, a guide vane leading edge, a guide vane trailing edge, and first and second flow-guiding side faces connecting the vane leading and trailing edges and forming different flow profiles along an axial extension. Each flow profile has a chord, a mean camber line, and a mean camber curve end angle between the mean camber line and the chord at the vane trailing edge. The guide vane is mounted to rotate about an axis of rotation defined by two pivot pins. Along the axial extension, the guide vane has at least one flow profile with a positive mean camber curve end angle and at least one flow profile with a negative mean camber curve end angle. The guide vane leading edge is tilted relative to the axis of rotation.