A reference Pelton turbine design

Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar

doi:10.1088/1755-1315/15/3/032005

Cited by 18 publications

(18 citation statements)

References 4 publications

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“…The buckets were mounted on the disc and fastened with two bolts. After assembly the turbine underwent a complete efficiency measurement in the test rig at the Waterpower Laboratory [3]. The resulting hill diagram with an absolute uncertainty in the order of ±0.25% is shown in Figure 8.…”

Section: Resultsmentioning

confidence: 99%

“…In Figure 1, the main dimensions of a Pelton turbine bucket are denoted, and Table 1 lists their quantities along with characteristic factors. In addition to the empirical rules of thumb the dimensions of the turbine are also limited by the available test rig [3]. Brekke for an H of 1400 m [5].…”

Section: Design Parameters and Strategymentioning

confidence: 99%

“…A Ph.D. project at the Waterpower Laboratory at the Norwegian University of Science and Technology is currently working on improving the knowledge regarding the flow in Pelton turbines [3]. Due to the natural limitations concerning publication of results concerning turbines from commercial companies, one of the goals of the project has been to design and manufacture an open reference Pelton turbine.…”

Section: Introductionmentioning

confidence: 99%

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A reference pelton turbine - design and efficiency measurements

Solemslie

Dahlhaug

2014

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. The Pelton turbine has been subject to a varying degree of research interest since the debut of the technology over a century ago. Despite its age there are gaps in the knowledge concerning the flow mechanisms effecting the flow through the turbine. A Pelton turbine has been designed at the Waterpower Laboratory at NTNU. This has been done in connection to a Ph.D. project focusing on the flow in Pelton turbine buckets. The design of the turbine has been conducted using in-house knowledge in addition to some comments from a turbine producer. To describe the geometry multiple Bézier curves were used and the design strategy aimed to give a smooth and continuous gradient along the main flow directions in the bucket. The turbine has been designed for the operational conditions of the Pelton test rig installed at the Waterpower Laboratory which is a horizontal single jet test rig with a jet diameter(ds) of 35 mm. The diameter(D) of the runner was set to 513 mm and the width(W ) of a bucket 114 mm, leading to a D /W ratio of 4.5. Manufacturing of the turbine has been carried out in aluminium and the turbine has undergone efficiency testing and visual inspection during operation at a head of 70 m. The turbine did not performed as expected and the maximum efficiency was found to be 77.75%. The low efficiency is mainly caused by a large amount of water leaving the bucket through the lip and hence transferring close to zero of its energy to the shaft. The reason for the large lip loss is discussed and two possible causes are found; the jet is located too close to the lip, and the inner surface of the bucket does not lead the water away from the lip. The turbine geometry and all data from both measurements and simulations will be available upon request in an effort to increase the amount of available data concerning Pelton turbines.

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Section: Resultsmentioning

confidence: 99%

Section: Design Parameters and Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A reference pelton turbine - design and efficiency measurements

Solemslie

Dahlhaug

2014

IOP Conf. Ser.: Earth Environ. Sci.

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“…The drawback of this method is that the splitter tilt angle cannot be modified as well as the cutout geometry. This approach has been reused by Solemslie and Dahlhaug (2012) to build the NUBRS description of the Pelton bucket for their reference Pelton turbine design. Michálková and Bastl (2015) propose a geometrical description based on uniform bicubic B-splines surfaces composed of 7 x 4 patches to model the inner surface of the bucket.…”

Section: Geometrical Modelingmentioning

confidence: 99%

Toward design optimization of a Pelton turbine runner

Vessaz

Andolfatto

Avellan

et al. 2016

Struct Multidisc Optim

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The objective of the present paper is to propose a strategy to optimize the performance of a Pelton runner based on a parametric model of the bucket geometry, massive particle based numerical simulations and advanced optimization strategies to reduce the dimension of the design problem. The parametric model of the Pelton bucket is based on four bicubic Bézier patches and the number of free parameters is reduced to 21. The numerical simulations are performed using the finite volume particle method, which benefits from a conservative, consistent, arbitrary Lagrangian Eulerian formulation. The resulting design problem is of High-dimension with Expensive Black-box (HEB) performance function. In order to tackle the HEB problem, a preliminary exploration is performed using 2'000 sampled runners geometry provided by a Halton sequence.

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“…However, only few publications present the design optimisation based on numerical results. This issue regarding the absence of publically available numerically based and experimentally validated Pelton optimisation results was addressed by Solemslie and Dahlhaug in 2012 [32].…”

Section: Historymentioning

confidence: 99%