Field Investigation on the Surge Performance of a Large Unit-Connected Steam Turbine Generator [includes discussion]

Armstrong, H. R.; Howard, S. B.; Johnson, I. B.

doi:10.1109/aieepas.1952.4498571

Cited by 24 publications

(4 citation statements)

References 11 publications

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“…He focused on the study and measurement of losses caused by bearings; using new deep grove bearings in place of the old ones, the efficiency significantly increased. In 1952 Armstrong [3] wrote a thesis about investigation of the performance of a steam Tesla turbine, aimed at determining the ways to improve the original Tesla's design. In 1960, Hasinger and Kehrt [4] investigated analytically and experimentally a Tesla pump using water as working fluid.…”

Section: Literature Reviewmentioning

confidence: 99%

Mechanical design and manufacture of a boundary layer pump

Bufalari,

Anselmi,

Rinchi

et al. 2023

E3S Web Conf.

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This paper describes the current efforts to develop and manufacture a first prototype for a boundary layer pump as a mean to assess future and more complex designs. Following an approach of “learning by doing”, a previous design was re-assessed from a mechanical/workshop point of view. Budget constraints and in-house manufacturing capabilities were taken into consideration to deliver a new design, suitable for quick production. Challenges such as disc holding, gap spacing, pump intake, discharge nozzles, and tolerances were addressed. Structural analysis has been conducted; where every single component has been modelled and sized accordingly to standard practices. As a support of structural analysis, FEM analysis was also performed with the aim of identifying, discussing, and fixing any potentially critical issues, particularly regarding the bolts holding together the discs into the power shaft. Finally, modal analysis was performed in order to test the dynamic response of the rotor: its critical frequencies would be far from the working range of the machine. This paper gives an overview of the critical issues to be taken into account during the mechanical design of boundary layer pump prototypes for different working fluids in the field of power generation and thermal management.

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Section: Literature Reviewmentioning

confidence: 99%

Mechanical design and manufacture of a boundary layer pump

Bufalari,

Anselmi,

Rinchi

et al. 2023

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

“…It offers flexibility in the design option with low manufacturing cost, reduces vibration and hence improves safety. Although many investigations have been carried out in terms of experimental studies [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] and numerical/analytical studies [11,14,[23][24][25][26][27][28], the result is still far from Tesla's achievement. This is mostly due to the losses issue that needs to be accounted for designing and testing the turbine.…”

Section: Fig 1 Illustration Of Adhesion and Cohesion Of Moleculesmentioning

confidence: 99%

“…In the year 1952, Armstrong [17] conducted an experimental study on the different nozzles; diverging nozzle and straight nozzle. The result showed that the diverging nozzle produced about one-third more horsepower than the straight nozzle for the case of the same pressure drop.…”

Section: Fig 1 Illustration Of Adhesion and Cohesion Of Moleculesmentioning

confidence: 99%

Study on the Effects of Individual Pitot Tube Inlet of a Bladeless Tesla Microturbine using Numerical Analysis

Basri

Salim

2023

CFDL

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In this paper, a comprehensive numerical analysis of a bladeless Tesla microturbine is presented. Various studies on the effects of Tesla design parameters have shown promising results. However, the limitations associated with the inherent nozzle design have often highlighted the low efficiency of the turbine. Therefore, the study was carried out using computational fluid dynamics (CFD) to demonstrate the efficiency of the turbine as a function of the performance of different openings of the inlet nozzles, i.e., as 1-opening and individual pitot tube opening. In this work, a validation study was performed with the existing manuscript before further investigating the effects of the different openings of the inlet nozzles. The results show that the configuration of 4 inlets with 4 openings (4i4o) results in higher velocity and pressure distribution compared to 4 inlets with 1 opening (4i1o). Consequently, 4i4o obtained a higher torque value compared to 4i1o with a difference of 10%. Hence, the thrust and efficiency values for the 4i40 were 33.69% and 34.30%, respectively, higher compared to the 4i1o. The performance of the Tesla turbine with the specified optimal configuration increased very significantly compared to the previous research studies. It can be concluded that the introduction of the functional theory of the ‘pitot-tube’, which considers the gaps individually by having a separate inlet for each of them, had a great impact on the performance of Tesla turbine.

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“…Boundary layer pumps have become an increasingly researched area of alternative turbomachinery due to their simplistic design of concentrically stacked, smooth discs, offering a more cost-effective solution to conventional, bladed turbomachinery [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A boundary layer pump's working principle is based on the Coanda effect [18] and kinetic energy is transmitted from the rotor to the fluid only by frictional forces which makes boundary layer pumps more suitable for some specific applications such as non-Newtonian fluids at which bladed turbomachinery cannot operate efficiently.…”

Section: Introductionmentioning

confidence: 99%

Insights Into the Flow Field and Performance of a Boundary Layer Pump

Rajendran,

Palaveev,

Anselmi

et al. 2023

Journal of Engineering for Gas Turbines and Power

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A flow field analysis of a realistic, integrated, multi-disc boundary layer pump as is necessary for investigating the reasons for typically quoted low efficiencies in such pumps is described. The study focuses on the 3D RANS solutions of a water boundary layer pump model created to replicate a design which consists of 170 discs and a volute channel. A baseline study is performed to investigate the rotor-only and volute-only flow fields and identify the losses in each as separate systems. Thereafter, an integrated model is characterized for different operating conditions. The flow fields of all three models are discussed and the results of the integrated model are compared to the experimental data. The results from the rotor-only model confirm the typically made claim that the rotor efficiency is relatively high, which in this case is 87% at the design point. The volute on its own indicated a hydraulic efficiency of ~97%. However, the integrated model yielded a rotor efficiency of ~74% and an overall pump efficiency of 51% at the design point, clearly outlining the fact that the effect of the volute integrated with the rotor is the reason for both the rotor and pump efficiency degradation. The reason for this drop in efficiency is discussed by highlighting the change in the flow topologies. The insights into the flow field and the identification of the reason for inefficiencies using a separated component analysis approach provides directions for avenues in which design improvements need to be attempted.

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Field Investigation on the Surge Performance of a Large Unit-Connected Steam Turbine Generator [includes discussion]

Cited by 24 publications

References 11 publications

Mechanical design and manufacture of a boundary layer pump

Mechanical design and manufacture of a boundary layer pump

Study on the Effects of Individual Pitot Tube Inlet of a Bladeless Tesla Microturbine using Numerical Analysis

Insights Into the Flow Field and Performance of a Boundary Layer Pump

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