Nested-Shell Flow Stabilizer for Control Valve Noise Reduction
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Solution Overview
Problem
Existing control valves face challenges in reducing noise and vibration associated with non-axisymmetric turbulent flow, as current flow stabilizers may not effectively attenuate high static-pressure noise in compressible fluids or prevent cavitation and erosion in liquids, and may require improvements in design for better performance.
Innovation Solution
A flow stabilizer with nested shells in an eccentric arrangement at the inlet end transitioning to a concentric arrangement at the outlet end, providing a series of angled flow paths that reduce turbulence and noise by guiding fluid flow from non-axisymmetric to axisymmetric, utilizing a main body with braces for structural support and fluid communication between shells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional flow stabilizers are used to reduce noise and vibration, then noise attenuation may be achieved, but they fail to effectively attenuate high static-pressure noise in compressible fluids or prevent cavitation and erosion in liquids
Solution Approach 1:
The flow stabilizer is segmented into multiple nested shells (typically three shells) that create multiple flow paths. Each shell divides the turbulent flow into smaller, controlled streams, allowing progressive attenuation of noise and vibration while maintaining effectiveness under high static-pressure conditions and preventing cavitation and erosion through distributed flow management
Solution Approach 2:
The flow stabilizer employs a nested structure where multiple shells are positioned concentrically within each other. This nested arrangement creates a series of flow paths between adjacent shells, allowing the flow to be progressively stabilized as it passes through each inter-shell space, thereby achieving effective noise attenuation and cavitation prevention in high-pressure applications
2Device complexity
If non-axisymmetric flow is not stabilized, then the structure is simpler, but noise and vibration from turbulent flow increase significantly
Solution Approach 1:
The flow stabilizer intentionally introduces a controlled asymmetric element through eccentric positioning of the nested shells. This asymmetric arrangement generates counter-rotating vortices that balance each other, converting non-axisymmetric turbulent flow into more stable axisymmetric flow patterns, thereby reducing noise and vibration while maintaining a relatively simple overall structure
3Object-affected harmful factors
If multiple nested shells are used to create flow paths, then noise attenuation improves, but manufacturing complexity and cost increase
Solution Approach 1:
The nested shells are designed to fit concentrically within each other, allowing them to be manufactured as separate components and then assembled in a straightforward sequence. This nesting approach enables noise attenuation through multiple flow paths while keeping manufacturing relatively simple, as each shell can be produced independently using standard fabrication processes and then positioned concentrically during assembly
4Reliability
If the flow stabilizer is designed to withstand high forces, then reliability in high-pressure applications improves, but structural complexity and material requirements increase
Solution Approach 1:
The structural load is segmented and distributed across multiple nested shells rather than concentrated in a single component. Each shell bears a portion of the high static-pressure load, and the distributed arrangement allows the use of thinner, less complex materials for each individual shell while collectively withstanding forces that would require much heavier construction in a single-component design
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 solution effectively reduces noise and vibration by transitioning non-axisymmetric flow to axisymmetric flow, minimizing turbulence and system vibration, and is designed to withstand high forces, making it suitable for various applications while being easier and less costly to manufacture than conventional flow stabilizers.
Implementation Method 1
a flow stabilizer with nested shells in an eccentric arrangement at an inlet end as they are in a concentric arrangement at an outlet end, thereby converting non-axisymmetric turbulent flow to substantially axisymmetric flow
Data Source
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AI summary
Aflow stabilizer adapted to be disposed in an outlet passage of a rotary valve includes a main body having an axis, a first end, and a second end. A first shell is disposed at least partially within the main body, and the first shell includes an axis, a first end, and a second end. A second shell is disposed at least partially within the main body and at least partially within the first shell, and the second shell includes an axis, a first end, and a second end. The axis of the first shell is angled relative to the axis of the main body and the axis of the second shell is angled relative to axis of the main body.