The design of three-dimensional turbine blades combined with profiled endwalls

Bagshaw, David; Ingram, Grant; Gregory-Smith, D. G.; Stokes, Mark; Harvey, N. W.

doi:10.1243/09576509jpe477

Cited by 15 publications

(19 citation statements)

References 15 publications

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“…SKEH is the primary parameter used in the design of the endwalls (Bagshaw et al [1]). It is defined as the product of a secondary kinetic energy definition and helicity…”

Section: Pitch Averaged Resultsmentioning

confidence: 99%

“…Results from the design computational fluid dynamics (CFD) can be found in the companion paper, Bagshaw et al [1] and the static pressure measurements for the datum and the novel geometry are provided in Fig. 3.…”

Section: Static Pressure Measurementsmentioning

confidence: 99%

“…A companion paper [1] described the design of the geometry used in the current paper. The key results from this work are as follows.…”

Section: Conclusion and Recommendationsmentioning

confidence: 99%

“…In a companion paper, Bagshaw et al [1], the authors describe the design of a novel turbine cascade geometry to reduce secondary flow. The current paper presents the experimental tests on the novel geometry, which combines three-dimensional blade design with profiled endwalls (PEW).…”

Section: Introductionmentioning

confidence: 99%

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An experimental study of three-dimensional turbine blades combined with profiled endwalls

Bagshaw

Ingram

Gregory-Smith

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents a detailed series of measurements on a novel design for reducing secondary flow in a linear cascade. The design of this geometry, which features profiled endwalls and three-dimensional blade shaping was discussed in a companion paper [1]. This paper presents the results of static pressure measurements on the blade surface, pneumatic pressure probe traverses, and surface oil flow visualization in order to build a comprehensive picture of the geometry's performance and function. Although the interactions between blade shaping and profiled endwalls are complex the experimental results show benefits over applying profiled endwalls alone.

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“…SKEH is the primary parameter used in the design of the endwalls (Bagshaw et al [1]). It is defined as the product of a secondary kinetic energy definition and helicity…”

Section: Pitch Averaged Resultsmentioning

confidence: 99%

Section: Static Pressure Measurementsmentioning

confidence: 99%

“…A companion paper [1] described the design of the geometry used in the current paper. The key results from this work are as follows.…”

Section: Conclusion and Recommendationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An experimental study of three-dimensional turbine blades combined with profiled endwalls

Bagshaw

Ingram

Gregory-Smith

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Highly loaded turbine blades (blades with a high turning angle), as one of the major measures to improve the aerodynamic performance of modern turbines, have a great potential in high-pressure stages of steam turbines, high-performance gas turbines, modern aero-engines, and aerospace engineering [1][2][3][4][5][6][7]. In the last two decades, many studies have been devoted to the investigation of the flow fields and losses of highly loaded turbine cascades [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Flow fields and losses downstream of an ultra-highly loaded turbine cascade with bowed blades

Tan

Zhang

Chen

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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For the first time, a systematic experimental investigation on flow fields and losses of an ultra-highly loaded turbine cascade with bowed blades has been conducted. Flow patterns, secondary flow vortices and vectors, losses, and yaw angles at the downstream outlet have been analysed based on the measurements. The results show that the flow fields downstream of the cascade are characterized by a complicated vortex structure including passage vortices (PVs), trailing edge vortices (TVs), and corner vortices (CVs). The high-loss cores at the cascade outlet roughly correspond to the high-vorticity regions. A −20 • bow angle gives the optimal aerodynamic performance under the conditions of this work, but the overall improvement is not significant. Appropriate negative blade bowing weakens the PVs and TVs and prevents the meeting and mixing of the PVs at the midspan, hence improving the flow fields and reducing the overall losses. However, negative blade bowing also increases the flow separation in corner regions, and enhances the CVs and the accumulation of low-energy air flow. This partially counteracts the beneficial effects, making the overall improvement not significant. The pitch-averaged yaw angle at the outlet of the cascade varies dramatically over the whole span. Negative blade bowing can improve the uniformity of the yaw angle distribution at the outlet. On the contrary, positive blade bowing degrades the aerodynamic performance of the cascade.

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Effect of the nonaxisymmetric endwall on wet steam condensation flow in a stator cascade

Han

et al. 2019

Energy Science & Engineering

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Steam turbines are critical pieces of power equipment in the electric power industry, and the study of wet steam condensation flow is important for improving the efficiency and safety of steam turbines. Wet steam nucleation, which is the main reason for thermodynamic losses, usually occurs downstream of the stator cascade. The mechanism of secondary flow loss control by the nonaxisymmetric endwall is the change of pressure distribution in the cascade channel. This mechanism also affects the wet steam condensation phenomenon. The positive/cosine function was proposed for endwall modification in the nucleation stage of a steam turbine. The design method presented in this paper can be used to produce endwall protrusions with different heights at different axial chords. To analyze the influence of the endwall protrusion design parameters on the condensation flow, nine endwall protrusion models were set up at varied axial positions. In comparison with the original cascade, the total pressure loss coefficient and outlet wetness were found to be ideal when the endwall protrusion maximum height was located at the 50% axial chord length of the stator and the protrusion was 3% of the blade height. The ideal incidence angle of this modified cascade was from −2° to + 10°.

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The design of three-dimensional turbine blades combined with profiled endwalls

Cited by 15 publications

References 15 publications

An experimental study of three-dimensional turbine blades combined with profiled endwalls

An experimental study of three-dimensional turbine blades combined with profiled endwalls

Flow fields and losses downstream of an ultra-highly loaded turbine cascade with bowed blades

Effect of the nonaxisymmetric endwall on wet steam condensation flow in a stator cascade

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