Effects of Radial Gap Ratio between Impeller and Vaned Diffuser on Performance of Centrifugal Compressors
| Autor: | Xiao He, Xinqian Zheng, Mohammadjavad Hosseini, Zhenzhong Sun |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Overall pressure ratio
Materials science 020209 energy impeller-diffuser interaction Mechanical engineering 02 engineering and technology lcsh:Technology Diffuser (thermodynamics) lcsh:Chemistry Impeller symbols.namesake 0202 electrical engineering electronic engineering information engineering Mass flow rate centrifugal compressor radial gap ratio tip-speed Mach number CFD General Materials Science Instrumentation lcsh:QH301-705.5 Fluid Flow and Transfer Processes lcsh:T Process Chemistry and Technology Centrifugal compressor General Engineering Choke Mechanics 021001 nanoscience & nanotechnology lcsh:QC1-999 Computer Science Applications Mach number lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 symbols Astrophysics::Earth and Planetary Astrophysics 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) Gas compressor lcsh:Physics |
| Zdroj: | Applied Sciences; Volume 7; Issue 7; Pages: 728 Applied Sciences, Vol 7, Iss 7, p 728 (2017) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app7070728 |
| Popis: | A high-performance centrifugal compressor is needed for numerous industry applications nowadays. The radial gap ratio between the impeller and the diffuser vanes plays an important role in the improvement of the compressor performance. In this paper, the effects of the radial gap ratio on a high-pressure ratio centrifugal compressor are investigated using numerical simulations. The performance and the flow field are compared for six different radial gap ratios and five rotational speeds. The minimal radial gap ratio was 1.04 and the maximal was 1.14. Results showed that reducing the radial gap ratio decreases the choke mass flow rate. For the tip-speed Mach number (impeller inlet) with Mu < 1, the pressure recovery and the loss coefficients are not sensitive to the radial gap ratio. However, for Mu ≥ 1, the best radial gap ratio is 1.08 for the pressure recovery and the loss coefficients. Furthermore, the impeller pressure ratio and efficiency are reduced by increasing the radial gap ratio. Finally, the compressor efficiency was compared for different radial gap ratios. For Mu < 1, the radial gap ratio does not have noticeable effects. In comparison, the radial gap ratio of 1.08 has the best performance for Mu ≥ 1. |
| Databáze: | OpenAIRE |
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