Air System Correlations: Part 2 — Rotating Holes and Two Phase Flow

Zimmermann, Horst; Kutz, J.; Fischer, R.

doi:10.1115/98-gt-207

Cited by 13 publications

(8 citation statements)

References 5 publications

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“…To overcome the value of U/C ax going to in nity, Zimmermann et al [12] has proposed a method where C d is plotted in the relative system against U/C ax,rel such that different correlations can be transformed to the same basis, in order to allow a comparison. In the relative system, C ax,rel is de ned as…”

Section: Discussionmentioning

confidence: 99%

“…Dittmann et al [14] investigated the discharge behaviour of rotating ori ces with pre-swirl. The discharge coef cients were plotted against the velocity ratio U/C ax in the relative frame of reference as described by Zimmermann et al [12]. The results show that the discharge coef cient is strongly dependent on the velocity ratio with a distinct maximum at U/C ax < 0.…”

Section: Introductionmentioning

confidence: 92%

“…Zimmermann et al [12] proposed the representation of discharge coef cient in the relative frame of reference. This is because previous studies, which adopted the U/C ax ratio tend to have a range that would build up to in nity, but, in the relative frame of reference, this range can be constrained between 0 and 1, and this allows different correlations to be compared on the same basis.…”

Section: Introductionmentioning

confidence: 99%

“…The works described above are summarized in Table 1. The maximum speed is not listed for McGreehan and Schotsch [7], Kutz and Speer [9], and Zimmermann et al [12] because they did not carry out experimental work. Alexiou et al [13] is the only one who used the velocity head ratio to represent the discharge coef cient because his rig comprised cross-ow, and this parameter is normally used in this type of system.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An investigation into the flow within inclined rotating orifices and the influence of incidence angle on the discharge coefficient

Indris

Pullen

Barnes

2004

Proceedings of the Institution of Mechanical Engineers, Part A:

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In many engineering machines, it is necessary to pass fluid, usually air, through rotating surfaces, such as a disc or drum. This is achieved by perforating the disc with a series of holes arranged on a pitch circle. It is vital for the machine designer to know the pressure ratio required to pass a desired mass flow rate. This characteristic is defined by determination of the discharge coefficient as a function of various parameters. Until recently, the literature describing this problem was small and covered a few particular cases. More articles are appearing and this present study seeks to add to the current level of knowledge by addressing the effect of the inclinations of the holes to the tangential direction. A rig was designed and built to perform the experiments and the data were compared with the numerical analysis performed by proprietary software STAR-CD. The results indicate that the discharge coefficient is highly affected by the rotational speed and that orientating the orifices at an appropriate angle of inclination enables the discharge coefficient to be maximized. Most of the studies in the past used the ratio of tangential speed and the ideal axial velocity to represent the discharge coefficient, but it has been revealed in this paper that incidence angle is more appropriate in correlating the effect of orifice inclination and rotation on the discharge coefficient. Both the experimental and numerical results confirm that the incidence angle plays a major role in dictating the discharge coefficient of the rotating orifices.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An investigation into the flow within inclined rotating orifices and the influence of incidence angle on the discharge coefficient

Indris

Pullen

Barnes

2004

Proceedings of the Institution of Mechanical Engineers, Part A:

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show abstract

“…They called the ratio of the tangential speed and the ideal axial velocity of the flow as a rotation number, Ro. Zimmermann et al [9] proposed the representation of discharge coefficient in the relative frame of reference. This is because-previous studies, which adopted the U/C id ratio, tend to have a range that would build-up to infinity, but, in the relative frame of reference, this range can be constrained between 0 and 1, and this allows different correlations to be compared on the same basis.…”

Section: Introductionmentioning

confidence: 99%

Correlations for the discharge coefficient of rotating orifices based on the incidence angle

Idris

Pullen

2005

Proceedings of the Institution of Mechanical Engineers, Part A:

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The flow through rotating orifices is of interest to the designer of machines incorporating such features. The designer often requires a set of correlations which can be used to check out preliminary designs and converge on a solution prior to attempting detailed and expansive analysis. The correlations given in this paper are based on the incidence angle, i, of the flow into the orifice and they allow the discharge coefficient for rotating orifices to be estimated for as many conditions and geometries as possible. The approach adopted is to group the parameters that affect the discharge coefficient to i = 0° (Reynolds number, orifice chamfer and radius, L/d ratio, pressure ratio, and pumping effect) and i ≠ 0° (rotation of the disc, preswirl, cross-flow, and the angle of inclination of the orifice). The effect of each parameter on the discharge coefficient can easily be observed when using this method. Furthermore, the method can predict the discharge coefficient for systems that have various parameters that are combined together. There is a good agreement between the correlations and the experimental results and the available data on rotating orifices in the open literature. The correlations also agree with various combinations run in computational fluid dynamics (CFD). The approach adopted in this paper, which is based on the incidence angle, can assist designers to find the combination of geometric and flow parameters that gives the best discharge coefficient for rotating orifices.

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Experimental laboratory tests of the pressure drop resulting from the liquid flow through orifices in a rotating disc

Wilk

2014

Experimental Thermal and Fluid Science

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Air System Correlations: Part 2 — Rotating Holes and Two Phase Flow

Cited by 13 publications

References 5 publications

An investigation into the flow within inclined rotating orifices and the influence of incidence angle on the discharge coefficient

An investigation into the flow within inclined rotating orifices and the influence of incidence angle on the discharge coefficient

Correlations for the discharge coefficient of rotating orifices based on the incidence angle

Experimental laboratory tests of the pressure drop resulting from the liquid flow through orifices in a rotating disc

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