Main Steam Valve Baffle Plate Vortex Suppression
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Solution Overview
Problem
In steam turbines, the generation of swirling vortex flows near the outer circumferential surface of the valve body leads to increased pressure loss and reduced efficiency due to kinetic energy loss in the fluid flow.
Innovation Solution
A main steam valve design incorporating a baffle plate within the valve chamber to interrupt and weaken the swirling vortex flow, reducing its impact on the fluid flow path and minimizing pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a strainer with shielding plate is provided on the side surface to control fluid flow, then the swirling vortex flow is suppressed in that region, but a swirling vortex flow is generated near the outer circumferential surface of the valve body where the shielding plate is not provided, causing kinetic energy loss and pressure loss increase
Solution Approach 1:
The invention divides the flow control function into multiple segments: the shielding plate on the strainer handles one region, while the baffle plate in the valve chamber handles the region near the valve body outer circumferential surface. This segmentation ensures comprehensive suppression of swirling vortex flows throughout the entire flow path, preventing kinetic energy loss in all critical areas.
Solution Approach 2:
The baffle plate acts as an intermediary element introduced into the valve chamber to interrupt and suppress the swirling vortex flow that forms near the valve body. This intermediate structure modifies the flow pattern by breaking the vortex formation, thereby preventing energy loss without interfering with the primary valve function.
2Object-affected harmful factors
If the fluid flows while curving at an acute angle through the strainer, then a secondary flow and swirling vortex flow are generated, but providing a shielding plate to control this flow increases device complexity
Solution Approach 1:
The baffle plate is designed to serve multiple functions: it suppresses swirling vortex flows, guides fluid flow smoothly, and maintains structural simplicity. By integrating these functions into a single element, the invention avoids increasing device complexity while effectively addressing the harmful flow patterns.
Solution Approach 2:
The baffle plate is strategically positioned only in the specific region where swirling vortex flows occur near the valve body outer circumferential surface. This localized approach addresses the problem area without adding unnecessary structures elsewhere, maintaining overall device simplicity while providing targeted flow control.
3Loss of energy
If a baffle plate is added to interrupt the swirling vortex flow, then pressure loss is reduced by maintaining kinetic energy, but the device complexity increases
Solution Approach 1:
The baffle plate is positioned specifically in the valve chamber region where swirling vortex flows occur, rather than throughout the entire valve structure. This localized placement minimizes the added complexity while effectively addressing the pressure loss problem in the critical flow region.
Solution Approach 2:
The baffle plate is designed to work passively with the existing fluid flow dynamics, utilizing the flow's own energy to achieve vortex suppression without requiring additional active control mechanisms or complex drive systems. The structure simply guides and interrupts the flow pattern to achieve the desired effect.
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 baffle plate configuration effectively suppresses the swirling vortex flow, reducing kinetic energy loss and preventing pressure loss increases, thereby enhancing the efficiency of the steam turbine by maintaining the fluid's kinetic energy and flow balance.
Implementation Method 1
a swirling vortex flow is generated as a result of separate fluid flowing into a velocity defect component of this secondary flow
Implementation Method 2
as a result of the fluid flowing while curving at an acute angle, a secondary flow is generated
Data Source
AI summary
A main steam valve includes a cylindrical guide centered about an O-axis, a valve body disposed inside the guide so as to be slidable in the O-axis direction, a valve shaft on which the valve body moves in the O-axis direction between open and closed positions, and a casing having a flow path and a valve seat formed on an inner surface thereof. The flow path guides out a fluid guided into the casing from the inflow direction along the O-axis direction. The valve body abuts against the valve seat when the valve body is in the closed position. A valve chamber, formed in the casing, has a baffle plate provided in a region between an outer circumferential surface of the guide and an inner surface of the casing. The baffle plate interrupts swirling vortex flow with spiral vortex core extending in the circumferential direction of the O-axis of the guide.