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Investigation on tip leakage flow characteristics of radial inflow micro turbine used in helium liquefying system.

Author(s) : LI X. M., LI J., PAN W., et al.

Type of article: Article, IJR article

Summary

Tip clearance leakage flow with different axial and radial clearance in a radial inflow helium micro turbine impeller used in helium liquefying system under the stage environment is investigated using a three-dimensional transient viscous flow simulation. The comparison of the numerical results with the experimental results is proved to verify the accuracy of the numerical method. The results indicate the formation and development mechanism of the tip leakage flow. The leakage flow effects in the helium turbine passage have slightly transient fluctuations. Then leakage vortex develops in the impeller passage and causes large leakage flow loss. Rotational speed and expansion ratio have great impact on leakage flow characteristics. Furthermore, there is a notable difference of the performance affected by axial clearance and radial clearance. The leakage mass flow and leakage flow loss are more affected by the radial clearance than the axial clearance. In addition, empirical formulas are obtained to describe the leakage mass flow and flow loss caused by the axial clearance and radial clearance. Finally, a modified semi-empirical formula is obtained based on the numerical results to calculate leakage flow loss correctly. The results in this paper can give a further understanding of leakage flow in radial inflow micro turbine and provide a method to estimate the tip clearance effect on performance and flow loss quantitatively.

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Pages: 51-60

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Details

  • Original title: Investigation on tip leakage flow characteristics of radial inflow micro turbine used in helium liquefying system.
  • Record ID : 30025365
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 98
  • Publication date: 2019/02
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2018.10.015

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