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A Numerical Study of Water Injection on Transonic Compressor Rotor Performance

Szabo, Istvan
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212107404

Abstract Details

2008, PhD, University of Cincinnati, Engineering : Aerospace Engineering.
In this study, numerical simulations of two-phase flow in a transonic compressor rotor (NASA Rotor 37) were performed. Both flow and droplets governing equations were formulated and solved in the reference frame of the rotating blades. An Eulerian-Lagrangian approach was used for the continuous and discrete phases with a two-way interaction model to simulate the mass-, momentum- and energy exchange between the different phases. Water particles were injected at the inlet with uniform particle mass flux, fully evaporating inside the rotating blade row. The phase change was most intense in areas adjacent to shock waves, where the slip velocity of the droplets was the highest. Results show decreased circumferentially averaged total temperature ratio of the air-vapor mixture across the span, which is the direct result of inter-phase energy coupling. An entropy based approach to calculate the isentropic efficiency of a wet compression process in a transonic compressor rotor was also presented. Under the proposed method, the viscous dissipation function was calculated everywhere in the domain in the post-processing phase of the numerical simulation and integrated to the wall, with special treatment in the near-wall regions where high rates of entropy generation occur. For a water to air mass flow ratio of 1% results show increased entropy production across the span, resulting in a 5% drop in compressor isentropic efficiency. Analytical integration of wall functions and numerical integration of the viscous dissipation function allows for reasonable results even with relatively coarse grids and can also be applied for single-phase flows. A parametric study of the effect of initial particle parameters on the wet compression process was also performed. Several speedlines have been computed with different amounts of water, especially near the tip. Results show that numerical stall can be delayed with injection of water near the tip, due to the increase of the axial momentum of the fluid in the endwall region, which is the direct result of phase change.
Mark G. Turner, ScD (Committee Chair)
Paul D. Orkwis, PhD (Committee Member)
Awatef Hamed, PhD (Committee Member)
Joseph P. Veres (Committee Member)
209 p.
Engineering
multiphase; compressor; turbomachinery; fogging; injection

Recommended Citations

Citations

  • Szabo, I. (2008). A Numerical Study of Water Injection on Transonic Compressor Rotor Performance [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212107404

    APA Style (7th edition)

  • Szabo, Istvan. A Numerical Study of Water Injection on Transonic Compressor Rotor Performance. 2008. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212107404.

    MLA Style (8th edition)

  • Szabo, Istvan. "A Numerical Study of Water Injection on Transonic Compressor Rotor Performance." Doctoral dissertation, University of Cincinnati, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212107404

    Chicago Manual of Style (17th edition)

ucin1212107404
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© 2008, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.