Effect of Bolts on Flow and Heat Transfer in a Rotor-Stator Disc Cavity

Mohamed, Sulfickerali Noor; Chew, John W.; Hills, Nicholas J.

doi:10.1115/gt2016-56470

Cited by 1 publication

(2 citation statements)

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“…While there is no direct experimental confirmation of 3 lobed structures, the level of unsteadiness predicted is similar to that indicated in measurements. The effect of geometry and flow conditions on flow structure is the subject of a further study [28].…”

Section: Discussionmentioning

confidence: 99%

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Flow and windage due to bolts on a rotating disc

Mohamed

Chew

Hills

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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The cooling air in a rotating machine is subject to windage as it passes over the rotor surface, particularly for cases where non-axisymmetric features such as boltheads are encountered. The ability to accurately predict windage can help reduce the quantity of cooling air required, resulting in increased efficiency. Previous work has shown that steady CFD solutions can give reasonable predictions for the effects of bolts on disc moment for a rotor-stator cavity with throughflow but flow velocities and disc temperature are not well predicted. Large fluctuations in velocities have been observed experimentally in some cases. Time-dependent CFD simulations reported here bring to light the unsteady nature of the flow. Unsteady Reynolds averaged Navier-Stokes (URANS) calculations for 120 0 and 360 0 models of the rotor-stator cavity with 9 and 18 bolts were performed in order to better understand the flow physics. Although the rotor-stator cavity with bolts is geometrically steady in the rotating frame of reference, it was found that the bolts generate unsteadiness which creates time-dependent rotating flow features within the cavity. At low throughflow conditions, the unsteady flow significantly increases the average disc temperature.

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Section: Discussionmentioning

confidence: 99%

“…The effect of geometry and flow conditions on flow structure is the subject of a further study. 28 3. The steady CFD significantly underpredicts the core flow swirl and the disc temperature inboard of the bolts for the rotationally dominated flow cases considered.…”

Section: Discussionmentioning

confidence: 99%