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

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

doi:10.1243/09576509jpe478

Cited by 11 publications

(12 citation statements)

References 9 publications

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“…However, following the experience of Ingram et al [11], where a strong feature caused a separation not predicted by the CFD, it is clear that these design predictions need to be tested by experiment. The sequel to this paper [17] investigates this.…”

Section: Discussionmentioning

confidence: 95%

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The design 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 describes a novel design for reducing secondary flow in turbines. The design builds on previous work on non-axisymmetric profiled endwalls by combining them with three-dimensional blade design. Profiled endwalls have been shown to effectively reduce secondary flow but have often been used as a 'retrofit' application where the blade design is left unchanged. In the current paper reverse compound lean is used to prepare the blade row for the application of profiled endwalls. Computational fluid dynamic predictions ofthe expected performance show benefits over and above those of applying profiled endwalls to the blade row alone. The paper describes the design of the novel geometry for the so-called 'Durham Cascade' and gives predictions of the expected performance.

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Section: Discussionmentioning

confidence: 95%

“…Experimental testing has been completed and the authors report on the results of this in reference [17], the work is also the subject of a patent application [18]. …”

Section: Discussionmentioning

confidence: 99%

The design 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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“…The curvature of the [15] Endwall profiling SKEH Ingram [8] Endwall profiling CSKE Corral and Gisbert [14] Endwall profiling SKEH + an exponential function of inlet swirl angle Bagshaw et al [16] Endwall profiling SKEH Nagel and Baier [17] Endwall profiling Weighted addition of various postprocessor results (averaged loss accounts for the major part)…”

Section: Numerical Methodologymentioning

confidence: 99%

Secondary Flow Loss Reduction in a Turbine Cascade with a Linearly Varied Height Streamwise Endwall Fence

Kumar

Govardhan

2011

International Journal of Rotating Machinery

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The present study attempts to reduce secondary flow losses by application of streamwise endwall fence. After comprehensive analysis on selection of objective function for secondary flow loss reduction, coefficient of secondary kinetic energy (CSKE) is selected as the objective function in this study. A fence whose height varies linearly from the leading edge to the trailing edge and located in the middle of the flow passage produces least CSKE and is the optimum fence. The reduction in CSKE by the optimum fence is 27% compared to the baseline case. The geometry of the fence is new and is reported for the first time. Idea of this fence comes from the fact that the size of the passage vortex (which is the prime component of secondary flow) increases as it travels downstream, hence the height of fence should vary as the objective of fence is to block the passage vortex from crossing the passage and impinging on suction surface of the blade. Optimum fence reduced overturning and underturning of flow by more than 50% compared to the baseline case. Magnitude and spanwise penetration of the passage vortex were reduced considerably compared to the baseline case.

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“…The cross-section profiles at the sections parallel to the end wall of all the cascades were identical and the tangential stacking line along the blade height is shown in Fig. 2, where the bow angle is positive when the dihedral angle between the pressure side and endwall is acute and vice versa for negative [2,5,7,[14][15][16][17][18]23].…”

Section: Methodsmentioning

confidence: 99%

“…An additional motivation of this work is that, it is the first time that a systematic study is conducted on the blade bowing effects in such an ultra-highly loaded turbine cascade, although a series of research on the blade bowing effects on turbine cascade aerodynamic performance has been reported on lowly loaded (turning angle ∼70 • ) [14,18,19], moderately loaded (turning angle ∼110 • ) [5,[15][16][17]23], and highly loaded (turning angle ∼130 • ) cascades [2]. Obviously, this work on the ultra-highly loaded turbine cascade (turning angle ∼160 • ) can be a good extension of the spectrum of blade loading in the research area of blade bowing effects on turbine cascade aerodynamic performance.…”

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

Cited by 11 publications

References 9 publications

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

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

Secondary Flow Loss Reduction in a Turbine Cascade with a Linearly Varied Height Streamwise Endwall Fence

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

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