Loss Model for Off-Design Performance Analysis of Radial Turbines with Pivoting-Vane, Variable-Area Stators

Meitner, Peter L.; Glassman, A. J.

doi:10.4271/801135

Cited by 29 publications

(19 citation statements)

References 1 publication

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“…Past efforts to develop performance prediction methods for radial inflow turbines mostly concentrated on the combination of one-dimensional flow analysis and appropriate loss models [1][2][3][4][5][6][7][8] in the scroll, vaned and/or vaneless nozzle, rotor and the exit duct.…”

Section: Introductionmentioning

confidence: 99%

LDV Measurements and Investigation of Flow Field Through Radial Turbine Guide Vanes

Eroğlu

Tabakoff

1989

Volume 1: Turbomachinery

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The results of LDV measurements and investigation of the detailed flow field in a radial inflow turbine nozzle are presented. The flow velocities were measured at upstream, inside and downstream of the nozzle blades for two different mass flow rates, using a three-component LDV system. Results are presented as flow turbine cascades because of the radial pressure gradients and the incidence effects. Although they show the existance of the leading edge vortices, the of passage vortices are either too weak or they do not at exist. The shape of leading edge vortices depends strongly on the incidence angle.

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Section: Introductionmentioning

confidence: 99%

LDV Measurements and Investigation of Flow Field Through Radial Turbine Guide Vanes

Eroğlu

Tabakoff

1989

Volume 1: Turbomachinery

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“…The penalty induced by the spacers and the clearances is far more important in the closed configuration than in the fully opened one. This has already been explained long ago by [19] since the relative importance of the clearances increases as the throat section of the nozzle decreases. In response to the alteration of both the mass-flow and the efficiency levels, the reactivity of the stage is modified as presented in Figure 5(b).…”

Section: Resultsmentioning

confidence: 79%

Dynamic Response in Transient Operation of a Variable Geometry Turbine Stage: Influence of the Aerodynamic Performance

Binder

Benitez

Carbonneau

2013

International Journal of Rotating Machinery

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The transient response of a radial turbine stage with a variable geometry system is evaluated. Mainly, the consequences of the variations of the aerodynamic performance of the stage on the response time are checked. A simple quasi-steady model is derived in order to formalize the expected dependences. Then an experimental campaign is conducted: a brutal step in the feeding conditions of the stage is imposed, and the response time in terms of rotational speed is measured. This has been reproduced on different declinations of the same stage, through the variation of the stator geometry, and correlated to the steady-state performance of the initial and final operating points of the transient phase. The matching between theoretical expectation and results is surprisingly good for some configurations, less for others. The most important factor identified is the mass-flow level during the transient phase. It increases the reactivity, even far above the theoretical expectation for some configurations. For those cases, it is demonstrated that the quasi-steady approach may not be sufficient to explain how the transient response is set.

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“…First, the turbine map is stretched along the corrected mass flow (ϕ) axis according to the percentage of the vanes' opening. Secondly, an efficiency decrement is added to the U/Co departure [42]. The outlet pressure is set at what is required for exhausting the gas, and the mach speed is found such that the turbine may operate at highest efficiency.…”

Section: Model Methodologymentioning

confidence: 99%

Model of a novel pressurized solid oxide fuel cell gas turbine hybrid engine

Burbank

Witmer

Holcomb

2009

Journal of Power Sources

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Loss Model for Off-Design Performance Analysis of Radial Turbines with Pivoting-Vane, Variable-Area Stators

Cited by 29 publications

References 1 publication

LDV Measurements and Investigation of Flow Field Through Radial Turbine Guide Vanes

LDV Measurements and Investigation of Flow Field Through Radial Turbine Guide Vanes

Dynamic Response in Transient Operation of a Variable Geometry Turbine Stage: Influence of the Aerodynamic Performance

Model of a novel pressurized solid oxide fuel cell gas turbine hybrid engine

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