Guide Blade Profile Centerline Axis Rotation Wear Reduction
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Solution Overview
Problem
Existing guide devices, such as variable turbine geometries, face wear issues and increased complexity due to pulsating exhaust gas forces, leading to reduced service life and efficiency, particularly in supercharging systems for internal combustion engines and fuel cells.
Innovation Solution
A guide blade design with a specific profile centerline and axis of rotation arrangement that reduces wear on components like blade levers and adjusting rings, minimizing the absorption of pulsations and excitations from fluid flow, thereby reducing vibrations and changing loads transmitted to other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional guide blade designs are used in variable turbine geometries, then the guide device can control exhaust gas flow, but the components experience high wear and reduced service life due to pulsating exhaust gas forces and vibrations
Solution Approach 1:
The patent changes the geometric parameters of the guide blade by positioning the axis of rotation at a specific location relative to the profile centerline and turning point. This parameter optimization reduces the absorption of pulsations and excitations from fluid flow, thereby reducing wear on components like blade levers and adjusting rings while maintaining reliable exhaust gas flow control throughout the service life
Solution Approach 2:
The patent converts the harmful pulsating exhaust gas forces into a beneficial design feature by strategically positioning the axis of rotation. This positioning causes the guide blade to naturally minimize the absorption of pulsations and excitations, transforming the previously harmful vibrational loads into reduced wear on mechanical components while maintaining effective flow control
2Reliability
If the guide blade design minimizes absorption of pulsations, then wear is reduced, but the actuating forces required to adjust the guide blades may increase
Solution Approach 1:
The patent optimizes the geometric parameters of the guide blade, specifically positioning the axis of rotation between the blade leading edge and the turning point of the profile centerline. This parameter optimization reduces the absorption of pulsations and excitations from fluid flow, thereby reducing wear on components while maintaining actuating forces at acceptable levels through efficient force transmission geometry
Data Source
AI summary
A guide blade (200) for a guide device (100), including a guide blade body (201) with a blade top side (210), a blade underside (220), a blade leading edge (230) and a blade trailing edge (240). The guide blade (200) also comprises a profile centerline (250) which is defined in a profile of the guide blade body (201) by the blade top side (210) and the blade underside (220) and runs between them from the blade leading edge (230) to the blade trailing edge (240), the profile centerline (250) having a turning point (IP). The blade leading edge (230) and the blade trailing edge (240) are connected by a profile chord (260). The guide blade (200) has a guide blade axis of rotation (PA). The axis of rotation (PA), starting from the blade leading edge (230) in the direction of the blade trailing edge (240), lies along the profile chord (260) between the blade leading edge (230) and the turning point (IP).