Effect of constant and variable radii fillet on secondary flow field of transonic turbine stage's Nozzle Guide Vane

Ananthakrishnan, K.; Govardhan, M.

doi:10.1109/icmae.2016.7549599

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…The characteristics of the turbine had been investigated and the optimal values of three of the parameters had been determined with planned physical experiment: pitch angle of the working blades, pitch angle of the guide vanes and number of the guide vanes. Ananthakrishnan K. et al [7] studied the effect of constant and variable radius fillets on the secondary flow loss of transonic turbine stage nozzle guide vanes. The results were discussed using the topological characteristics of the flow field, Mach number, and density contour lines.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Influence Factors of Guide Vanes Torque in Variable Geometry Turbine Adjusting Mechanism

Zhong,

Chen,

Zhao

et al. 2023

IEEE Access

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More and more attention has been paid to research on variable geometry turbine engines with the increasing improvement of performance requirements for military turbines. Due to the fixed working angle of the inlet guide vane, the performance of a conventional fixed geometry turbine is optimal only for turbines near the design point. To match the aircraft's starting, climbing, cruising, deceleration, landing and other working states, it is necessary to change the turbine speed. This will not only reduce the performance of the turbine but also increase the fuel loss. The variable geometry turbine is a perfect solution to this problem. It is not necessary to change the speed of the turbine, but only the working angle of the inlet rotating guide vane of the turbine. The variable geometry turbine can be matched to each state of the aircraft's entire voyage. The turbine guide vane can be adjusted by 7°to bring about a 10% change in the flow rate of the entire machine. With constant turbine inlet temperature, the fuel loss can be effectively reduced. The rotating guide vane is impacted by the high-temperature and high-pressure gas and cold air in the inner culvert. Hot and cold air produce two types of aerodynamic torque on the rotating guide vane. There is also a friction torque on the rotating shaft of the guide vane. Therefore, the rotating guide vanes of variable geometry turbines are subjected to three types of torques. The main objective of this paper is to study three factors influencing the guide vane torque in the main flow path. The three influencing factors are the turbulence intensity of the gas, the flow ratio of cold gas to hot gas and the location distribution of the gas film holes on the guide vane. In this paper, CFD temperature-fluid-solid coupling algorithm combined with UDF program is applied to solve the torque of guide vane shaft at three influencing factors. The results show that the three factors, turbulence intensity, flow ratio and air film hole distribution, can have a significant effect on the guide vane torque. This is of great significance for the research and design of variable geometry turbines.

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Section: Introductionmentioning

confidence: 99%

Analysis of Influence Factors of Guide Vanes Torque in Variable Geometry Turbine Adjusting Mechanism

Zhong,

Chen,

Zhao

et al. 2023

IEEE Access

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“…23 And, the blade LE fillet can significantly reduce the horseshoe vortex. 31 A fillet of 1 d high and 2 d long on a GV nozzle with an asymmetric variation on SS and pressure surface (PS) reduces the total pressure gradient by accelerating the incoming BL. 24 Sung and Lin reported that the change in the thickness of a fillet could fade away secondary flows over the airfoil and endwall.…”

Section: Introductionmentioning

confidence: 99%

“…It explains how the variable fillet outperforms by reducing the secondary flow features and mitigating BL growth. 28,31 Numerical and experimental numerical investigation on the effect of LE modification in the low-speed turbine stage with non-axisymmetric endwall contouring was performed. It was found that endwall contouring and LE fillet helps to effectively reduce the horseshoe vortex as well as the secondary flow losses occurring in the turbine passage.…”

Section: Introductionmentioning

confidence: 99%

Effect of fillets on a blade/vane of wave energy harvesting impulse turbine

Maurya¹,

Thandayutham²,

Samad

2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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Fillets on leading edges (LE) of turbine blades alter flow patterns and change the loss profile. A bidirectional flow impulse turbine utilized for harnessing wave energy is introduced and computational fluid dynamics (CFD) was used to perform various analysis. In the present work, fillets of different radii on the leading and trailing edges of both the rotor blade (RB) and guide vane (GV) are modified to study the change in overall performance. After an appropriate gird convergence study, ANSYS-CFX 16.0 solver is used for solving the Reynolds averaged Navier-Stokes (RANS) equations incorporating the k-ω-SST turbulence closure model. The numerical investigations were performed using the high-resolution scheme with the convergence criteria of 10−6 to produce unwavering results. The results show that the boundary layer near the endwall creates flow blockage and losses. Also, the increase in pressure drop due to the thickening of the boundary layers (BLs) across the blade/vane leads to a depletion in the overall performance of the turbine. The rotor and guide vane filleted turbine experience higher losses than the base model due to the radial pressure gradient that is explained with post-processed figures. The concept of fillet shapes has been applied to gas turbines and which improves the performance of the turbine due to a reduction in the secondary flow losses occurring inside the turbine and the same concept has been applied to wave energy air turbine to check its performance based on the losses present across the turbine passage.

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Effect of constant and variable radii fillet on secondary flow field of transonic turbine stage's Nozzle Guide Vane

Cited by 2 publications

References 12 publications

Analysis of Influence Factors of Guide Vanes Torque in Variable Geometry Turbine Adjusting Mechanism

Analysis of Influence Factors of Guide Vanes Torque in Variable Geometry Turbine Adjusting Mechanism

Effect of fillets on a blade/vane of wave energy harvesting impulse turbine

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