Gas Turbine Stator Vane Slot Bypass for Fluid Loss
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Solution Overview
Problem
In gas turbines, fluid loss occurs near the walls of vanes due to turbulence in gaps formed between the vanes and the casing and diaphragm, leading to inefficiency.
Innovation Solution
A stator structure with slot parts connected to the gaps between the vane ends and the casing and diaphragm, which bypasses a portion of the working fluid to reduce turbulence and fluid loss, including first and second slots, tubes, and expansion tubes to diffuse the fluid effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vanes are assembled to casing and diaphragm with rotating members, then the stator structure can be constructed and operated, but assembly tolerances cause gaps to form between vane ends and the casing/diaphragm, leading to fluid loss and turbulence
Solution Approach 1:
The patent extracts the harmful fluid flow path by introducing slot parts that divert working fluid away from the gaps between vanes and casing/diaphragm. The slot parts connected to tubes create a separate bypass channel that prevents fluid from entering the turbulent gap regions, thereby eliminating the energy loss caused by assembly tolerance gaps.
Solution Approach 2:
The slot parts and tubes act as intermediary structures that mediate between the main fluid flow and the gaps. These intermediaries capture and redirect the working fluid before it can enter the harmful gap regions, using the tube network as a mediator to channel fluid through a controlled path instead of allowing uncontrolled leakage into the gaps.
2Ease of operation
If gaps are formed between vane ends and casing/diaphragm due to assembly tolerances, then rotation and assembly are facilitated, but turbulence occurs in the gaps causing fluid loss and reduced efficiency
Solution Approach 1:
The slot parts extract and remove the problematic fluid flow from the gap regions. By providing an alternative path through slots and tubes, the harmful turbulence-generating flow is taken out of the system, allowing the gaps to remain for rotational capability while preventing efficiency loss.
Solution Approach 2:
The patent converts the potentially harmful gap flow into a beneficial controlled flow path. The slots and tubes transform the wasted turbulent flow into a directed bypass flow that can be managed and potentially utilized, turning the assembly tolerance issue from a harm into a controllable feature.
Data Source
AI summary
A stator structure and a gas turbine having the same are provided. The stator structure includes a plurality of rows of stators arranged on an inner peripheral surface of a casing, the stators being arranged alternately with a plurality of rows of blades arranged on an outer peripheral surface of a rotor, wherein each of the stators includes a vane including a first end and a second end, the first end of the vane being coupled to the inner peripheral surface of the casing by a first rotating member and a diaphragm coupled to the second end of the vane by a second rotating member. A first gap is formed between the first end of the vane and the inner peripheral surface of the casing, and a second gap is formed between the second end of the vane and the diaphragm. The vane may be provided with a slot part connected to the first and second ends of the vane to bypass a part of working fluid to the first and second gaps.