Essay about Tesla Turbine

Tesla Turbine

Computers & Liquids 88 (2013) 344–353

Contents lists available at ScienceDirect

Computer systems & Liquids

journal home page: www.elsevier.com/locate/compfluid

Synthetic and computational solutions pertaining to three-dimensional flow-field and family member pathlines to get the spinning flow in a Tesla disk turbine Sayantan Sengupta, Abhijit Guha ⇑

Mechanical Anatomist Department, American indian Institute of Technology, Kharagpur, Kharagpur 721302, India

a r t i c l at the

i d f to

Article history:

Received 22 December 2012

Received in revised kind 18 Summer 2013

Acknowledged 8 September 2013

Available on the web 19 Sept. 2010 2013

Keywords:

Tesla generator

Absolute pathline

Relative pathline

3-D CFD simulation

Circulation reversal

a b t t ur a c t

The three-dimensional flow field and the flow pathlines within a Tesla disc generator have been looked at analytically and computationally. The description from the flow field includes the three-dimensional variant of the gigantic velocity, tangential velocity and pressure of the fluid inside the flow pathways within the rotating discs. An in depth comparison between results obtained from the analytical theory and computational fluid dynamic (CFD) solutions of Navier–Stokes equations is offered in order to establish the stability of the simplified mathematical version. The present job reveals the dependence of the shape, size and orientation of the pathlines on numerous operating guidelines (such as tangential velocity ratio, radial pressure drop, inlet nozzle angle, and position of the exit) and native balance of numerous forces (viz. inertial, viscous, centrifugal and Coriolis). The relative value of two possible methods of representing the pathlines in the absolute and relative shape of reference point are talked about that provide physical understanding of delicate flow features. Ó 2013 Elsevier Limited. All privileges reserved.

1 ) Introduction

The study of detecting and analysing fluid path is important in various fields of fluid dynamics, such as in atmospheric science and oceanography. The direction of wind flow and marine current can be seriously affected by the rotation of the earth. When fluid travels more than a relative rotating frame of reference this acquires extra components of masse force, viz. centrifugal and Coriolis pressure which may not be realised in the inertial body of reference point. The function of centrifugal force should be to push the fluid within a radially outward direction, although the position of Coriolis force is always to bend the fluid within a particular direction depending on the course of fluid velocity and sense of rotation with the reference body. American meteorologist Ferrel [1] had demonstrated how fluid flow in the Upper and The southern part of Hemisphere is usually deflected as a result of effect of Coriolis force. This sort of deflections and many other flow physics can be captured by the flow visualisation approach. In fluid dynamics, the pattern of flow may be visualised in various ways just like streamline, pathline, streakline, fb timeline etc . Presently, the visualisation of fluid flow in turbomachinery (see [2–5], etc . ) is a working area of analysis. In this daily news, fluid flow pattern in a special type of turbomachinery, viz. Tesla generator [6], invented by the famous science tecnistions Nikola Tesla has been investigated. With this kind of aim, the threedimensional fluid flow field within the Tesla turbine continues to be computed in this article both numerically by the application of computational

⇑ Corresponding publisher.

E-mail address: a. [email protected] iitkgp. ernet. in (A. Guha).

0045-7930/$ - see front matter Ó 2013 Elsevier Ltd. All legal rights reserved. http://dx.doi.org/10.1016/j.compfluid.2013.09.008

fluid mechanics as well as analytically by the putting on a mathematical theory produced in [7]. With this context, a brief description regarding Tesla turbine is presented below for the convenience of understanding of the readers.

Tesla turbine is a bladeless turbo-machinery in which the rotor is usually constructed by a series of co-axial, parallel flat discs. The discs are attached to a central shaft maintaining a tiny gap...

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1998; 102(1012): 71–82.

[21] Guha A. Optimisation of aero gas turbine machines. Aeronaut. J

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H. Sengupta, A. Guha as well as Computers & Fluids 88 (2013) 344–353

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microstructured wall areas. Phys Essential fluids 2011; 23(8) [Art. No . 082003].