Interstage Flow Inlet Layout for Uniform Compressor Secondary Flow
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Solution Overview
Problem
Existing multistage centrifugal compressors suffer from aerodynamic disruptions due to non-uniform distribution of secondary refrigerant flow, leading to inefficient performance and reduced refrigeration cycle efficiency.
Innovation Solution
The implementation of a collector cavity fluidly coupled to the secondary flow inlet, which uniformly distributes the secondary refrigerant flow before merging it with the main flow, minimizing disruptions and enhancing compressor performance through a directing vane assembly and optimized interstage flow inlet design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If secondary refrigerant flow is introduced directly into the main flow without uniform distribution, then the structure is simpler, but aerodynamic disruptions occur and performance decreases
Solution Approach 1:
The interstage flow inlet is segmented into multiple separate inlets arranged circumferentially, with each inlet serving a specific sector of the collector passage. This segmentation allows uniform distribution of secondary refrigerant flow around the collector, preventing aerodynamic disruptions while maintaining structural simplicity through modular design
Solution Approach 2:
Each circumferential inlet is positioned to serve a specific local region of the collector passage, ensuring uniform flow distribution across different sectors. This local quality approach optimizes flow patterns in each region while maintaining overall system efficiency
2Device complexity
If non-uniform secondary refrigerant flow distribution is used, then the device complexity is reduced, but pressure discrepancies increase and aerodynamic efficiency decreases
Solution Approach 1:
The flow distribution system is segmented into multiple circumferentially arranged inlets, each serving a specific sector. This segmentation ensures uniform pressure distribution across the collector passage by preventing flow concentration in any single region, thereby reducing pressure discrepancies while maintaining reasonable structural complexity
Solution Approach 2:
The flow distribution transitions from a single-point or radial approach to a circumferential multi-dimensional arrangement. By distributing inlets around the circumference of the collector passage, the system achieves uniform pressure distribution across the entire flow cross-section, eliminating pressure discrepancies without requiring overly complex flow control mechanisms
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 results in improved compressor performance by reducing pressure discrepancies and enhancing aerodynamic efficiency, leading to better refrigeration cycle performance and efficiency.
Implementation Method 1
a directing vane assembly, a collector passage surrounding the directing vane assembly, and a circumferential insertion slot fluidly coupling the collector passage with the directing vane assembly
Data Source
AI summary
A compressor is provided. The compressor includes a first stage portion with a first impeller assembly and a first diffuser assembly, a second stage portion with a second impeller assembly and a second diffuser assembly, and an interstage portion situated between the first stage portion and the second stage portion. The interstage portion includes a directing vane assembly, a collector passage surrounding the directing vane assembly, and a circumferential insertion slot fluidly coupling the collector passage to the directing vane assembly.