Stator Vane Ring Pressure Gradient for Resonance Control
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Solution Overview
Problem
The stator vane ring in existing rotary machines experiences a difference in natural frequency between end and central vanes due to varying restraining forces, leading to a widened bandwidth and increased risk of resonance during operation.
Innovation Solution
A stator vane ring design featuring a vane group connected by arc-shaped shroud segments with a pressing unit that applies pressure, where the pressure at the center is smaller than at the ends, ensuring uniform natural frequencies across vanes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform pressure is applied to all vanes, then the structure is simple, but the natural frequency bandwidth is widened and resonance risk increases
Solution Approach 1:
The pressing unit applies different pressures to different locations of the vane group: higher pressure at the ends and lower pressure at the center. This local differentiation in pressure distribution equalizes the natural frequencies of end vanes and central vanes, narrowing the overall natural frequency bandwidth and reducing resonance risk.
2Ease of manufacture
If end vanes are more restrained than central vanes, then assembly is easier, but natural frequency difference increases and bandwidth widens
Solution Approach 1:
The pressing unit changes the pressure parameter across different locations of the vane group. By applying higher pressure to end vanes and lower pressure to central vanes, the system compensates for the inherent difference in restraining forces, equalizing natural frequencies without complicating the assembly structure.
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
This design narrows the bandwidth of natural frequencies, reducing the likelihood of resonance and enhancing operational stability by balancing the restraining forces on end and central vanes.
Implementation Method 1
The pressing unit has a pressure distribution in which the pressure at a center of the shroud segment in the circumferential direction is smaller than the pressure at both ends of the shroud segment in the circumferential direction
Data Source
AI summary
This stationary vane ring comprises a vane group having a plurality of vanes arrayed in the circumferential direction of an axis, a shroud segment in which the radial ends of the plurality of vanes of the vane group are connected to form an arc so as to connect the plurality of vanes in the circumferential direction, and a pressing portion that applies radial pressure to the vane group so that the vane group is pressed against the shroud segment, the pressing portion having pressure distribution such that the pressure at the circumferential center of the shroud segment is less than the pressure at both circumferential ends of the shroud segment.