Influence of Vane-Blade Spacing on Transonic Turbine Stage Aerodynamics: Part I—Time-Averaged Data and Analysis

Venable, B. L.; Delaney, R. A.; Busby, Judy; Davis, Roger L.; Dorney, Daniel J.; Dunn, Michael G.; Haldeman, Charles W.; Abhari, Reza S.

doi:10.1115/1.2836718

Cited by 31 publications

(18 citation statements)

References 21 publications

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“…According to the open literature, this trend is confirmed by some authors [42][43][44][45][46] but seems not general (as also reported and discussed by [41]), either for a lack of detailed data or for a case dependency in the stator wake-potential field coupling along the axial direction, in the axial gap region.…”

Section: Axial Gapmentioning

confidence: 72%

Stator-Rotor Interaction in Axial Turbine: Flow Physics and Design Perspective

Gaetani¹

2018

Aircraft Technology

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The stator-rotor interaction is an important issue in turbomachinery design when the highest performances are targeted. Different characters mark the interaction process in high-pressure or low-pressure turbines depending both on the blade height and on the Reynolds number. For small blade heights, being the stator secondary flows more important, a more complex interaction is found with respect to the high blades, where the stator blade wake dominates. In low-pressure turbines, the stator wake promotes the transition to turbulent boundary layer, allowing for an efficient application of ultra-high lift blades. First, a detailed discussion of the flow physics is proposed for high-and low-pressure turbines. Some off-design conditions are also commented. Then, a design perspective is given by discussing the effect of the axial gap between the stator and the rotor and by commenting the effects of three-dimensional design on the interaction.

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Section: Axial Gapmentioning

confidence: 72%

Stator-Rotor Interaction in Axial Turbine: Flow Physics and Design Perspective

Gaetani¹

2018

Aircraft Technology

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“…9 1.31 0.45 Meas. Venable et al 10 4.84 1.10 URANS Chang and Tavoularis 19 -1.18 URANS Yamada et al 24 3.99 0.18 Meas. Gaetani et al 25 2.30 0.55 Meas.…”

Section: Analysed Data and Linear Correlation Methodsmentioning

confidence: 99%

“…Funazaki et al 3 -6.24 1.00 3 Restemeier et al 9 -1.39 0.89 3 Venable et al 10 2.00 0.66 3 Chang and Tavoularis 19 0.35 0.01 3 Yamada et al 24 -2.89 0.74 3 Gaetani et al 25 -0.33 0.01 3 TFD -1.71 0.99 3 loss mechanism. The study by Perdichizzi 17 suggested that the spanwise position of the two-dimensional flow is influenced by the Mach number, which indicates that the influence on the interaction exists.…”

Section: Correlations Of Stator Outlet Mach Number and Reduced Blade mentioning

confidence: 99%

Importance of the vane exit Mach number on the axial clearance-related losses

Grönman

Biester

Turunen-Saaresti

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part A:

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More efficient and physically smaller axial turbine designs are promoted to lower emissions and increase revenue. The physical size and the weight of the axial turbine can be minimised by adjusting the distance between successive stator and rotor rows. The influence of changing stator-rotor axial clearance can usually have either a positive or a negative influence on the turbine performance, and the reasons for this varying behaviour are not currently fully understood. A previous study revealed several design parameters that correlate with the efficiency curve shape. However, the effects of two parameters, namely the stator outlet Mach number and the reduced blade passing frequency, still remained unclear. Therefore, a novel approach is taken to analyse the correlations between the two design parameters and the axial clearance efficiency curve shape. Several different turbines are analysed using data available in the literature, and also new data are presented. The study suggests that the stator outlet Mach number correlates reasonably well with the efficiency curve shape, and it was further linked to five loss mechanisms and the rotational speed. Although the unsteady interaction plays an important role in the loss share, the level of unsteadiness did not correlate with the efficiency curve shape.

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“…Studies have been made to investigate the effect of axial gap on the aerodynamic performance of the turbine stage, and some efforts among them revealed the importance of unsteadiness and the mechanism of the losses in turbomachinery. Venable et al [2] varied the vane-blade spacing in a transonic turbine and reported the tendency of adiabatic efficiency increase when the rotorstator axial gap is increased. He [3] made three-dimensional unsteady Navier Stokes analysis of stator-rotor interaction and established the same result.…”

Section: Introductionmentioning

confidence: 99%

Effect of Axial Gap on the Aerodynamics of 1 and 1.5 Stage Turbines

Subbarao

Govardhan

2012

The International Conference on Applied Mechanics and Mechanica

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Axial gap is one of the few important parameters that affect the performance of a turbine. Present work involves the computational study in 1 and 1.5 stage turbines with axial gaps of 15% and 50%. For each axial gap, investigation is done at three flow coefficients; namely, 0.68, 0.78 and 0.96. The turbine components nozzle, rotor and stator are modeled for both the axial gaps. Mid-span pressure distribution of the rotor for the design configuration is compared with the experimental results and found to be in good agreement. Total pressure, axial velocity, entropy and Mach number distributions along with torque are analyzed for all the configurations. Results indicate that the performance of the turbine is dependent on axial gap.

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Influence of Vane-Blade Spacing on Transonic Turbine Stage Aerodynamics: Part I—Time-Averaged Data and Analysis

Cited by 31 publications

References 21 publications

Stator-Rotor Interaction in Axial Turbine: Flow Physics and Design Perspective

Stator-Rotor Interaction in Axial Turbine: Flow Physics and Design Perspective

Importance of the vane exit Mach number on the axial clearance-related losses

Effect of Axial Gap on the Aerodynamics of 1 and 1.5 Stage Turbines

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