Centrifugal Compression Test Device Interstage Inflow Simulation
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Solution Overview
Problem
In uniaxial multistage centrifugal compressors, performance prediction accuracy is low due to the lack of realistic simulation in single-stage test devices, especially when interstage inflow is not accounted for, and existing single-stage test devices fail to replicate the conditions of real machines accurately.
Innovation Solution
A centrifugal compression test device is designed with a rotary shaft, impeller, flow path forming sections, and a pressure loss application unit to simulate interstage inflow conditions, including an introduction flow path, inlet flow path, and interstage inflow path, which allows for a more accurate verification test by replicating the environment of a real machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single stage test device is used for performance prediction, then the device complexity is reduced, but the measurement precision and reliability of performance prediction deteriorate due to inability to simulate interstage inflow conditions
Solution Approach 1:
The flow path forming section is divided into multiple independent flow paths: introduction flow path, inlet flow path, and interstage inflow path. This segmentation allows the single stage test device to independently control and simulate different flow conditions, enabling accurate reproduction of interstage inflow effects while maintaining the simplicity of a single stage configuration.
Solution Approach 2:
The interstage inflow path acts as an intermediary component that introduces fluid from the introduction flow path into the inlet flow path, simulating the effect of interstage inflow from subsequent stages. This intermediary structure enables the test device to reproduce complex multistage conditions without requiring an actual multistage compressor configuration.
2Reliability
If interstage inflow path is added to simulate real machine conditions, then the reliability of verification test is improved, but the device complexity increases
Solution Approach 1:
The single stage test device is designed with multi-functional flow path forming section that can simultaneously create introduction flow, inlet flow, and interstage inflow paths. This universal design allows the same device to perform both basic single stage testing and complex interstage inflow simulation, eliminating the need for separate multistage test devices while maintaining high verification reliability.
Solution Approach 2:
The flow path forming section creates simplified copies of the interstage inflow paths found in actual multistage centrifugal compressors. By replicating the essential flow path geometry and connection relationships, the test device accurately reproduces interstage inflow effects without requiring a full-scale multistage compressor, thus improving reliability while controlling complexity.
3Ease of operation
If conventional single stage test device without interstage inflow is used, then the ease of operation is maintained, but the loss of information occurs regarding interstage inflow effects on performance
Solution Approach 1:
The flow path forming section is designed to automatically generate and regulate the interstage inflow through its internal structure. The introduction flow path and interstage inflow path are configured to naturally create the inflow conditions from the fluid being tested, eliminating the need for external complex control systems while ensuring accurate capture of interstage inflow effects on performance measurements.
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 device enhances the reliability and accuracy of performance prediction for centrifugal compressors with interstage inflow by simulating the conditions of a real machine, improving the reliability of verification tests and predicting performance more accurately.
Implementation Method 1
The impeller is fixed to an outer circumferential surface of the rotary shaft and configured to pump a fluid flowing from a first side in an axial direction to an outside in a radial direction while rotating together with the rotary shaft
Implementation Method 2
The driving source drives the rotary shaft around the axis
Data Source
AI summary
A centrifugal compression test device includes a flow path forming section and an inlet space forming section. The flow path forming section forms an introduction flow path, an inlet flow path, and an interstage inflow path. The introduction flow path guides a fluid from the outside toward the inside in the radial direction. The inlet flow path is connected to the introduction flow path. The interstage inflow path extends from the outside toward the inside in the radial direction and is connected to the inlet flow path. The inlet space forming section is formed an annular shape having an introduction opening section through which a fluid is introduced from a part in the circumferential direction and the outside in the radial direction at the first side of the introduction flow path. Further, a front end of the introduction flow path is connected to the inlet space forming section.