Micro Turbine Expansion Chamber Guide Vane Structure
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Solution Overview
Problem
Conventional micro turbine generators face issues with a bulky expansion chamber, high pressure loss, excessive air velocity, and low air uniformity, which affect thermal efficiency and heat exchange efficiency in the recuperator.
Innovation Solution
A micro turbine generator with a guide vane structure in the expansion chamber that divides it into reverse flow regions, reducing air velocity and pressure loss while enhancing uniformity, and is designed to be compact and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the diffusion angle of compressed air is restricted to not exceed 7 degrees, then the compressed air uniformity is improved, but the expansion chamber becomes too long or too wide
Solution Approach 1:
The expansion chamber is divided into multiple sections by guide vanes that create reverse flow regions. This segmentation allows the air flow to be controlled in discrete zones, achieving uniform distribution without requiring a long diffusion path, thus maintaining compact chamber volume while improving air uniformity.
Solution Approach 2:
Instead of relying solely on linear diffusion along the flow direction, the guide vanes introduce reverse flow in perpendicular directions. This dimensional approach to flow control achieves uniformity through multi-directional mixing rather than extended linear diffusion, reducing the required chamber length.
2Stability of the object's composition
If the diffusion of compressed air in the expansion chamber is increased, then the compressed air uniformity is improved, but the pressure loss becomes overly large
Solution Approach 1:
The guide vanes are designed to create dynamic reverse flow patterns that adapt to the incoming compressed air. The reverse flow regions dynamically mix the air stream, achieving uniformity through controlled dynamic interaction rather than excessive static diffusion, thereby minimizing pressure loss while improving uniformity.
3Volume of stationary object
If the expansion chamber is made compact, then the device complexity is reduced, but the compressed air velocity remains high
Solution Approach 1:
The compact expansion chamber is segmented into reverse flow regions by guide vanes. This segmentation creates multiple flow paths and interaction zones within the compact volume, allowing velocity reduction through distributed flow control rather than requiring a large chamber for natural deceleration.
Solution Approach 2:
The guide vanes act as intermediary elements between the compressed air inlet and the recuperator. They mediate the velocity reduction process by creating reverse flow regions that dissipate kinetic energy through controlled mixing, enabling velocity reduction in a compact chamber without direct impact losses.
4Device complexity
If conventional expansion chamber design is used, then the structure is simple, but the micro turbine thermal efficiency decreases
Solution Approach 1:
The expansion chamber is segmented into reverse flow regions using guide vanes, creating a more complex internal structure. This segmentation improves thermal efficiency by ensuring uniform air distribution to the recuperator, maximizing heat exchange effectiveness despite the increased structural complexity.
Solution Approach 2:
The guide vane structure introduces reverse flow in directions perpendicular to the main flow, adding dimensional complexity to the chamber design. This multi-dimensional flow control optimizes air distribution and heat exchange efficiency, improving thermal performance despite the more complex 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
The guide vane structure results in a compact expansion chamber with reduced pressure loss, slowed air velocity, and improved air uniformity, enhancing thermal efficiency and heat exchange while maintaining a simple structure and low production costs.
Implementation Method 1
The guide vane structure divides the expansion chamber into a plurality of reverse flow regions
Implementation Method 2
The expansion chamber reduces the velocity of the compressed air
Implementation Method 3
enhances the uniformity of the compressed air
Implementation Method 4
the compressed air experiences overly large pressure loss; the diffusion of the compressed air in the expansion chamber is inevitably accompanied by pressure loss
Data Source
AI summary
A micro turbine generator includes a compressor, a guide channel, an expansion chamber, and a recuperator. The expansion chamber includes an air inlet, an air outlet, and a guide vane structure. The air inlet is disposed at one end of the expansion chamber, connected with the compressor through the guide channel, and receives an air compressed by the compressor. The air outlet is disposed at the other end of the expansion chamber, connected with the recuperator, and discharges the air, allowing the air to enter the recuperator. The guide vane structure extends inward from an inner wall of the expansion chamber to allow the air to pass the guide vane structure before being discharged from the air outlet to enter the recuperator.