Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.467915
Title: Flow Between a Rotating and a Stationary Disc.
Author: Owen, J. M.
Awarding Body: University of Sussex
Current Institution: University of Sussex
Date of Award: 1969
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Abstract:
A disc rotating near a stator is used as a theoretical and experimental model of an air-cooled gas turbine disc. Experimenls are described which were conducted for the case of the disc rotating with no stator present; for the disc rotating near the stator; and with a superimposed radial outflow of fluid between the disc and the stator, with the disc either stationary or rotating. For the radial outflow conditions, numerical solutions of the turbulent boundary layer equations are obtained, and predictions of radial and tangential velocity distributions, radial pressure distributions, and moment coefficients are compared with the experimental results. Results are presented from experiments carried out using a thi rtyinch diameter disc rotating at up to 4,500 revs per minute at distances from 0.45 to 2.7 inches from a thirty-inch diameter perspex st~tor. Experiments are also described for the case of a radial outflow between the rotor and stator, in which air was supplied at flow rates up to two POUI. per second. Data are produced to show that whilst the presence of the stator can reduce the frictional moment coefficient on the rotating disc, compared with the free disc, radial outflow can considerably increase the moment coefficient. The results of experiments conducted with a peripheral shroud on the stator are also presented. It is shown that the effect of a shroud is to increase the moment cceff'Lcient s, for the case of a superimposed outflow, and to cause positive pressures between the disc and the stator compared with the negative pressures for the equivalent unshrouded conditions • • The conditions for inflow, and the extent of the inlet separation zone, are examined, with and without the presence of the peripheral shroud, and it is shown that considerably less air,is needed to prevent inflow when the shroud is fitted.A theoretical study of the heat transfer is conducted in which the conditions for the use of Reynold ~ analogy are given. The numerical solution of the boundary layer equations is extended to the energy equation, and predictions of temperuture distribution and Nusselt numbers are made with arbitrary boundary conditions. The Nusselt numbers are shown to be consistent with available experimental data.
Supervisor: Not available Sponsor: Not available
Qualification Name: Doctoral Thesis - University of Sussex. Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.467915  DOI: Not available
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