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Title: Numerical simulation of the effects of rotor-stator spacing and wake/blade count ratio on turbomachinery unsteady flows

Abstract

A two-dimensional time-accurate Navier-Stokes solver for incompressible flows is used to simulate the effects of the axial spacing between an upstream rotor and a stator, and the wake/blade count ratio on turbomachinery unsteady flows. The code uses a pressure-based method. A low-Reynolds number two-equation turbulence model is incorporated to account for the turbulence effect. By computing cases with different spacing between an upstream rotor wake and a stator, the effect of the spacing is simulated. Wake/blade count ratio effect is simulated by varying the number of rotor wakes in one stator passage at the computational inlet plane. Results on surface pressure, unsteady velocity vectors, blade boundary layer profiles, rotor wake decay and loss coefficient for all the cases are interpreted. It is found that the unsteadiness in the stator blade passage increases with a decrease in the blade row spacing and a decrease in the wake/blade count ratio. The reduced frequency effect is dominant in the wake/blade count ratio simulation. The time averaged loss coefficient increases with a decrease in the axial blade row spacing and an increase in the wake/blade count ratio.

Authors:
;  [1]
  1. Pennsylvania State Univ., University Park, PA (United States). Center for Gas Turbines and Power
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
194273
Resource Type:
Journal Article
Journal Name:
Journal of Fluids Engineering
Additional Journal Information:
Journal Volume: 117; Journal Issue: 4; Other Information: PBD: Dec 1995
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 20 FOSSIL-FUELED POWER PLANTS; UNSTEADY FLOW; COMPUTERIZED SIMULATION; TURBOMACHINERY; PERFORMANCE; S CODES

Citation Formats

Yu, W S, and Lakshminarayana, B. Numerical simulation of the effects of rotor-stator spacing and wake/blade count ratio on turbomachinery unsteady flows. United States: N. p., 1995. Web. doi:10.1115/1.2817316.
Yu, W S, & Lakshminarayana, B. Numerical simulation of the effects of rotor-stator spacing and wake/blade count ratio on turbomachinery unsteady flows. United States. https://doi.org/10.1115/1.2817316
Yu, W S, and Lakshminarayana, B. 1995. "Numerical simulation of the effects of rotor-stator spacing and wake/blade count ratio on turbomachinery unsteady flows". United States. https://doi.org/10.1115/1.2817316.
@article{osti_194273,
title = {Numerical simulation of the effects of rotor-stator spacing and wake/blade count ratio on turbomachinery unsteady flows},
author = {Yu, W S and Lakshminarayana, B},
abstractNote = {A two-dimensional time-accurate Navier-Stokes solver for incompressible flows is used to simulate the effects of the axial spacing between an upstream rotor and a stator, and the wake/blade count ratio on turbomachinery unsteady flows. The code uses a pressure-based method. A low-Reynolds number two-equation turbulence model is incorporated to account for the turbulence effect. By computing cases with different spacing between an upstream rotor wake and a stator, the effect of the spacing is simulated. Wake/blade count ratio effect is simulated by varying the number of rotor wakes in one stator passage at the computational inlet plane. Results on surface pressure, unsteady velocity vectors, blade boundary layer profiles, rotor wake decay and loss coefficient for all the cases are interpreted. It is found that the unsteadiness in the stator blade passage increases with a decrease in the blade row spacing and a decrease in the wake/blade count ratio. The reduced frequency effect is dominant in the wake/blade count ratio simulation. The time averaged loss coefficient increases with a decrease in the axial blade row spacing and an increase in the wake/blade count ratio.},
doi = {10.1115/1.2817316},
url = {https://www.osti.gov/biblio/194273}, journal = {Journal of Fluids Engineering},
number = 4,
volume = 117,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 1995},
month = {Fri Dec 01 00:00:00 EST 1995}
}