Non-axisymmetric turbine end wall profiling

Gregory-Smith, D. G.; Ingram, Grant; Jayaraman, Padma Sheela; Harvey, N. W.; Rose, Martin G.

doi:10.1243/0957650011539027

Cited by 20 publications

(10 citation statements)

References 16 publications

(20 reference statements)

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“…The vortex was not significantly weakened, but its migration across the passage towards the suction surface was partially blocked. Similar research on end wall profiling was carried out by Gregory-Smith et al [4] , Ingram et al [5,6] . Weiss and Fottner [7] have done experiments on the influence of load distribution on secondary flows in a straight turbine cascade.…”

Section: Introductionmentioning

confidence: 53%

Effect of streamwise fences on secondary flows and losses in a two-dimensional turbine rotor cascade

2006

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To control secondary flows, streamwise fences were attached to end wall of a linear turbine rotor cascade. The cascade had 8 blades of 400 mm long and 175 mm chord. The blades deflected the flow by 120°. The fences were made out of 0.7 mm thick brass sheet and the heights of the fences were 14 mm, 18 mm respectively. The curvature of the fences was the same as that of the blade camber line. The fences were fixed normal to the end wall and at half pitch away from the blades. The experimental program consists of total pressure, static pressure measurements at the inlet and outlet of the cascade, by using five-hole probe. In addition, static pressure on the blade suction surface and pressure surface was also obtained. Fences are effective in preventing the movement of the pressure side leg of the horseshoe vortex. Consequently the accumulation of low energy fluid on the suction surface is minimised. End wall losses are reduced by the fences due to weakening of the end wall cross flow.

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Section: Introductionmentioning

confidence: 53%

Effect of streamwise fences on secondary flows and losses in a two-dimensional turbine rotor cascade

2006

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“…Usually the fillet (and the endwall) is truncated at the front and rear of the endwall to save space and the endwall is designed with streamlined elements transitioned into the fillet, e.g. with a nonaxisymmetric endwall contouring [8]. To address this problem we reconstruct the fillet curve C F as a clear and significant feature for the base part of the blade.…”

Section: Slicing Surfaces For the Base Partmentioning

confidence: 99%

Volumetric Geometry Reconstruction of Turbine Blades for Aircraft Engines

Großmann

Jüttler

2012

Curves and Surfaces

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Abstract. We present a framework for generating a trivariate B-spline parametrization of turbine blades from measurement data generated by optical scanners. This new representation replaces the standard patchbased representation of industrial blade designs. In a first step, the blade surface is represented by a smoothly varying family of B-spline curves. In a second step, the blade is parametrized by a trivariate B-spline volume. The resulting model is suitable for numerical simulation via isogeometric analysis, as well as for a fully automatic structured mesh generation with standard finite elements. We focus on the industrial applicability of the framework, by using standard turbine blade features throughout the process.

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“…The resulting secondary flows were significantly reduced in the whole passage and the measured net secondary loss was reduced by 30%. With the same design method, Gregory-Smith et al 12 redesigned the Durham cascade nonaxisymmetric endwall to restrict the profile in the blade passage so that the nonaxisymmetric endwall design was suitable for application to a real machine. The test results indicated that the new profile showed a similar reduction in the strength of the secondary flow but did not produce the same level of loss reduction as the old one designed by Harvey et al 10 With the refined measurement technique, which captured the flow near the endwall more accurately in the cascade, Ingram et al 13 presented some new results of the Durham cascade with the nonaxisymmetric endwall profile [10][11][12] to investigate their flow mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…With the same design method, Gregory-Smith et al 12 redesigned the Durham cascade nonaxisymmetric endwall to restrict the profile in the blade passage so that the nonaxisymmetric endwall design was suitable for application to a real machine. The test results indicated that the new profile showed a similar reduction in the strength of the secondary flow but did not produce the same level of loss reduction as the old one designed by Harvey et al 10 With the refined measurement technique, which captured the flow near the endwall more accurately in the cascade, Ingram et al 13 presented some new results of the Durham cascade with the nonaxisymmetric endwall profile [10][11][12] to investigate their flow mechanism. In contrast to the work of Gregory-Smith, the measurement results showed that the design of Gregory-Smith had more reduction in secondary loss because the measurements capture the undesirable corner vortex in the design of Harvey et al 10 Praisner et al 14 designed the nonaxisymmetric endwall profiles for three different LP turbine blades.…”

Section: Introductionmentioning

confidence: 99%

The aerodynamic optimization design of turbine cascade nonaxisymmetric endwall and the midgap influence assessment

Líu

Shen

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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The nonaxisymmetric endwall profiling has been proven to be an effective tool to reduce the secondary flow loss in turbomachinery. In the present work, first, without considering the endwall midgap in the real machine, an endwall optimization design procedure for reducing secondary flow losses has been developed, which allowed complete threedimensional parameterization turbine endwall design. The profile of the endwall has been designed using automatic numerical optimization by means of an improved efficient global optimization algorithm based on kriging surrogate model. Next, a large-scale linear cascade with a low-speed wind tunnel has been chosen for the experimental validation of the optimization results. The experimental measurements and numerical simulations both demonstrated that the total pressure loss and secondary flow intensity were reduced with the nonaxisymmetric endwall used in the cascade passage. Then, in order to evaluate the ability of the optimized nonaxisymmetric endwall with the midgap, the midgap was added in for both the baseline flat endwall and the optimized nonaxisymmetric endwall in the numerical simulations analysis. The entropy generation rates analysis were used for the investigation of loss distribution in the passage. For the cascade in the present work, with the midgap added in, the optimized nonaxisymmetric endwall did not perform as well as the situation without the midgap in the loss reduction. In addition, comparing to the baseline flat endwall, the optimized nonaxisymmetric endwall needed more net leakage flow to avoid the ingress of passage flow into the midgap.

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Non-axisymmetric turbine end wall profiling

Cited by 20 publications

References 16 publications

Effect of streamwise fences on secondary flows and losses in a two-dimensional turbine rotor cascade

Effect of streamwise fences on secondary flows and losses in a two-dimensional turbine rotor cascade

Volumetric Geometry Reconstruction of Turbine Blades for Aircraft Engines

The aerodynamic optimization design of turbine cascade nonaxisymmetric endwall and the midgap influence assessment

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