Numerical study of sliding wear caused by a loaded pin on a rotating disc

This paper presents a numerical study of the effect of rotor mounted bolts on the moment coefficient and flow structure within a rotor-stator cavity representative of modern gas turbine engine design. The CFD computations are performed using the commercial code FLUENT. The simulation methodology is first validated using experimental data from plain co-rotating disc and rotor-stator cavities from the open literature. Comparisons are then made with experimental data obtained from a test rig at the Thermo Fluid Mechanics Research Centre (TFMRC), University of Sussex. Computations were performed at Reφ = 6.8 × 106, Cw = 5929 (λT = 0.35) with different numbers of bolts (0 < N < 60), and also a continuous ring, at r/b = 0.9. The study has improved the current understanding of the effect on moment coefficient and flow structure that rotor mounted protrusions have in rotor-stator systems. It is seen that the contribution of skin friction to the moment coefficient reduces as the number of bolts is increased. The size and shape of the wake created by a rotating bolt also means that the pressure loss per bolt reduces with N but the overall effect is to increase the moment coefficient because there are more bolts.

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Experiment numerical study of dry sliding wear behavior of epoxy/periwinkles shell particulate composites

Journal of the Chinese Advanced Materials Society ◽

10.1080/22243682.2015.1124736 ◽

2016 ◽

Vol 4 (2) ◽

pp. 123-139 ◽

Cited By ~ 1

Author(s):

F. Asuke ◽

V. S. Aigbodion

Keyword(s):

Sliding Wear ◽

Wear Behavior ◽

Numerical Study ◽

Particulate Composites ◽

Dry Sliding Wear ◽

Dry Sliding

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Influence of Peripheral Opening on the Central Core Flow Behaviour in a Rotor-Stator System

Volume 1: Symposia, Parts A, B and C ◽

10.1115/fedsm2009-78088 ◽

2009 ◽

Author(s):

Fadi Abdel Nour ◽

Roger Debuchy ◽

Ge´rard Bois ◽

Hassan Naji

Keyword(s):

Static Pressure ◽

Radial Flow ◽

Numerical Study ◽

Outer Region ◽

Experimental Tests ◽

Flow Property ◽

Computation Method ◽

Swirl Ratio ◽

Rotating Disc ◽

The Core

This work relates to an experimental, theoretical and numerical study of a turbulent flow with separated boundary layers between a rotating disc (rotor) and a stationary one (stator) without any superposed radial flow. The originality of this study is that the pre-swirl ratio at the periphery of the cavity (Kp) is lower than the core swirl ratio (KB) corresponding to the solid body rotation, as predicted by Batchelor in the case of infinite discs: this is what the authors call a rotor-stator system with low pre-swirl ratio. Under these conditions, recent works have shown that the core swirl ratio (K) is a decreasing function of the radius, at least in the peripheral region. This behaviour has rather been observed in the cavities with superposed centripetal radial flow. In the present paper, this flow property is explained starting from an asymptotic approach which leads to step-by-step analytical computation method of the radial distribution of the core swirl ratio (K) and of the static pressure on the stator side p*. The validation of the theory is based both on experimental and numerical results. The experimental tests are carried out in a rotor-stator cavity for different values of the pre-swirl ratio, which is done by geometrical changes of the periphery of the system. The experimental data mostly include the velocity measurements and the turbulent correlations by hot-wire anemometry in interstice between the discs, as well as the static pressure measurements on the stator side. Comparisons with predictions from the CFD code Fluent are also provided. The numerical simulations are performed using the two-equation k – ω SST turbulence model, assuming a 2D-axisymmetric steady flow, in a domain corresponding to the inter-disks spacing and the peripheral outer region of the cavity. Computed and experimental values are in good agreement with the theoretical results.

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Global stability of the rotating-disc boundary layer with an axial magnetic field

Journal of Fluid Mechanics ◽

10.1017/jfm.2013.162 ◽

2013 ◽

Vol 724 ◽

pp. 510-526 ◽

Cited By ~ 11

Author(s):

Christian Thomas ◽

Christopher Davies

Keyword(s):

Magnetic Field ◽

Boundary Layer ◽

Linear Stability ◽

Axial Magnetic Field ◽

Numerical Study ◽

Control Strategies ◽

Base Flow ◽

Global Instability ◽

Rotating Disc ◽

Radially Inhomogeneous

AbstractA numerical study is conducted to investigate the influence of a uniform axial magnetic field on the global linear stability of the rotating-disc boundary layer. Simulation results obtained using a radially homogenized base flow were found to be in excellent agreement with an earlier linear stability analysis, which indicated that an axial magnetic field can locally suppress both convective and absolute instabilities. However, the numerical results obtained for the genuine, radially inhomogeneous, flow indicate that a global form of instability develops for sufficiently large magnetic fields. The qualitative nature of the global instability is similar to that which was observed in a previous study, where mass suction was applied at the rotating disc surface. It is shown that, just as for the case with mass suction, it is possible to explain the promotion of global instability by considering a model that includes detuning effects, which are associated with the radial variation of locally defined absolute temporal frequencies. The recurrence of the same type of instability behaviour when two distinct flow control strategies are implemented, one using suction and the other an axial magnetic field, indicates that the phenomena described by the model may be considered generic.

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