Flow and Heat Transfer in Rotating-Disc Systems

Owen, J. Michael

doi:10.1615/ichmt.1994.intsymphetattransturb.140

Cited by 206 publications

(273 citation statements)

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“…The starting point is based on the estimation of the dimensionless flow rate circulating inside the rotor and stator boundary layers, denoted respectively and , as in reference [19]. and are deduced from the stationary solutions valid for fixed and rotating infinite discs, summarized in Owen & Rogers [11]. In addition, the dimensionless volume flow rate outside the boundary layers is also considered:…”

Section: Fig 1 Sketch Of the Rotor-stator Cavitymentioning

confidence: 99%

“…This controversy was followed by numerous works to verify the validity of these theories. Since, theoretical solutions were obtained, which appear in particular in the references of Owen and Rogers [11], as well as more recently in that of Poncet et al [2].…”

Section: Introductionmentioning

confidence: 96%

“…They also have shown that both turbulent regime, near the periphery, and laminar flow, closer to the axis, can coexist. The value of the core swirl ratio is not universal: Owen and Rogers [11] found a theoretical value equal to 0.382 in the case of infinite disks, Szeri and al. [15] obtained 0.313 in a system rotor-stator with a large clearance, this last result being also obtained by Dijkstra and van Heijst [16].…”

Section: Introductionmentioning

confidence: 99%

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Influence of a weak superposed centripetal flow in a rotor-stator system for several pre-swirl ratios

Nour¹,

Rinaldi²,

Debuchy³

et al. 2012

International Journal of Fluid Machinery and Systems

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The present study is devoted to the influence of a superposed radial inflow in a rotor-stator cavity with a peripheral opening. The flow regime is turbulent, the two boundary layers being separated by a core region. An original theoretical solution is obtained for the core region, explaining the reason why a weak radial inflow has no major influence near the periphery of the cavity but strongly affects the flow behavior near the axis. The validity of the theory is tested with the help of a new set of experimental data including the radial and tangential mean velocity components, as well as three components of the Reynolds stress tensor measured by hot-wire anemometry. The theoretical results are also in good agreement with numerical results obtained with the Fluent code and experimental data from the literature.

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Section: Fig 1 Sketch Of the Rotor-stator Cavitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of a weak superposed centripetal flow in a rotor-stator system for several pre-swirl ratios

Nour¹,

Rinaldi²,

Debuchy³

et al. 2012

International Journal of Fluid Machinery and Systems

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“…For small amounts of superimposed flow, the flow structure in the cavity is dominated by rotation; conversely for large amounts, the flow structure is dominated by the superimposed flow. Owen and Rogers (1989) developed a useful parameter to delineate these two regimes. This is the turbulent flow parameter λ T which takes its definition from Von Kármán's (1921) solution (using a one-seventh power law for the velocity profile) for the flow entrained by a free disc.…”

Section: Introduction and Review Of Previous Workmentioning

confidence: 99%

A numerical investigation of moment coefficient and flow structure in a rotor–stator cavity with rotor-mounted bolts

Moghaddam

Long

Sayma

2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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The torque associated with overcoming the losses on a rotating disc is of particular importance to the designers of gas turbine engines. Not only does this represent a reduction in useful work, but it also gives rise to unwanted heating of metal surfaces and the adjacent fluid. This article presents a numerical study on the effect of rotor-mounted bolts on the moment coefficient and velocity distributions within a rotor–stator cavity under conditions representative of modern gas turbine engine design. Steady-state, two-dimensional and three-dimensional, computational fluid dynamics simulations are obtained using the FLUENT commercial code with a standard k–ɛ turbulence model. The model is validated against experimental data and then used to investigate the effects of varying the number of bolts and also a continuous ring. Two test cases are investigated: one corresponds to where the flow structure is dominated by the superimposed flow (λT = 0.35); and the other, where rotation is expected to govern the flow structure (λT = 0.35). The principal flow phenomena in the vicinity of the bolts were described using the simulation results. Increasing the number of bolts will decrease the relative total pressure difference around bolts and increase the tangential velocity of the core of fluid between the rotor and stator. It was also found out that the free-stream Reynolds number of the flow approaching the bolts decreases and angle of attack increases with increasing number of bolts. As a consequence, the bolts’ wake character changes leading to a situation where the wake of one bolt is not fully collapsed in advance of the following bolt. The occurrence of Taylor columns were also investigated in the rotor–stator system with rotor-mounted bolts. It was found that while increasing the number of bolts can decrease the Rossby number to produce an intermediate rotation in the system, the Taylor columns will not be produced even for 60 bolts under the both flow conditions. The contribution of skin friction to the overall moment coefficient reduces as the number of bolts increases and the pressure-related losses increase. Increasing the number of bolts will decrease the moment produced by each individual bolt. However, since there are more bolts in the system the total moment of all bolts will increase by increasing their number. There also appears to be a point where increasing the number of bolts does not bring about an increase in the overall moment coefficient. It is also interesting to report that the moment coefficient associated with a continuous ring is similar to that for a plain disc.

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“…Many practical systems can be modeled in terms of disk rotating in an infinite environment or in a housing. The importance of heat transfer from a rotating body can thus be ascertained in cases of many types of machineries, for example computer disk drives (Herrero et al 1994), rotating disk reactors for bio-fuel production and gas or marine turbines (Owen and Rogers 1989).…”

Section: Introductionmentioning

confidence: 99%

The Effects of Hall and Joule Currents and Variable Properties on an Unsteady MHD Laminar Convective Flow Over a Porous Rotating Disk with Viscous Dissipation

Sattar¹,

Ferdows²

2012

Heat Transfer Phenomena and Applications

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Flow and Heat Transfer in Rotating-Disc Systems

Cited by 206 publications

References 0 publications

Influence of a weak superposed centripetal flow in a rotor-stator system for several pre-swirl ratios

Influence of a weak superposed centripetal flow in a rotor-stator system for several pre-swirl ratios

A numerical investigation of moment coefficient and flow structure in a rotor–stator cavity with rotor-mounted bolts

The Effects of Hall and Joule Currents and Variable Properties on an Unsteady MHD Laminar Convective Flow Over a Porous Rotating Disk with Viscous Dissipation

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