An experimental study of rotational pressure loss in rotor-stator gap

Chong, Yew Chuan; Staton, D.A.; Mueller, Markus; Chick, John

doi:10.1016/j.jppr.2017.05.007

Cited by 9 publications

(8 citation statements)

References 17 publications

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“…The minor loss factor for the sudden expansion (kse) and contraction (ksc) in the stationary condition are calculated respectively as follow [10]:…”

Section: B Sudden Expansion and Contractionmentioning

confidence: 99%

“…The minor loss factor for the contraction in the entrance of rotor axial ducts kr is calculated as [4], [10]:…”

Section: B Sudden Expansion and Contractionmentioning

confidence: 99%

“…Approximate minor loss factor for short ducts such as radial cooling duct in stator and rotor are as The minor loss factor for the friction between the flow and the surface of the axial cooling duct between the stator lamination and the housing is calculated as [10]:…”

Section: Straight Lengthmentioning

confidence: 99%

“…However, the turbulent one is mostly applied during the calculation. This factor presents it by Reynold number (Re) as follow [ The minor loss factor for the rotating section of the machine is defined as [10]:…”

Section: Straight Lengthmentioning

confidence: 99%

See 3 more Smart Citations

Review of the Analytical Flow Model to Predict the Hydraulic Behaviour in Electrical Machine

Ghahfarokhi

Kallaste

Vaimann

et al. 2019

2019 Electric Power Quality and Supply Reliability Conference (PQ) &Amp; 2019 Symposium on Electrical Engineering and Mechatron

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This paper considers the analytical flow analysis for the through-flow ventilated electrical machine to predict the airflow rate in the different sections of the machine. This method can be applied to other types of air forced cooling electrical machine. For these purposes, the airflow paths are modeled by flow resistance network. The developing of the flow resistance network and calculating the flow resistances are described in details.

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“…The minor loss factor for the sudden expansion (kse) and contraction (ksc) in the stationary condition are calculated respectively as follow [10]:…”

Section: B Sudden Expansion and Contractionmentioning

confidence: 99%

“…The minor loss factor for the contraction in the entrance of rotor axial ducts kr is calculated as [4], [10]:…”

Section: B Sudden Expansion and Contractionmentioning

confidence: 99%

Section: Straight Lengthmentioning

confidence: 99%

Section: Straight Lengthmentioning

confidence: 99%

See 2 more Smart Citations

Review of the Analytical Flow Model to Predict the Hydraulic Behaviour in Electrical Machine

Ghahfarokhi

Kallaste

Vaimann

et al. 2019

2019 Electric Power Quality and Supply Reliability Conference (PQ) &Amp; 2019 Symposium on Electrical Engineering and Mechatron

View full text Add to dashboard Cite

show abstract

“…He put the emphasis on the velocity profiles and heat transfer characteristics, but failed to discuss the axial pressure losses. Yew Chuan measured the pressure loss in the rotor-stator gap [13] and presented the entry effect of air flow entering the annular gap with inner cylinder rotation [14]. Yew's study demonstrated that the flow resistance caused by rotation could be significant, and concluded that the friction factor of laminar flow was not affected by rotation.…”

Section: Introductionmentioning

confidence: 99%

Flow Resistance Modeling for Coolant Distribution within Canned Motor Cooling Loops

Wang

Yao

Shen

2020

Chin. J. Mech. Eng.

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Taylor-Couette-Poiseuille (TCP) flow dominates the inner water-cooling circulation of canned motor reactor coolant pumps. Current research on TCP flow focuses on torque behaviors and flow regime transitions through experiments and simulations. However, research on axial flow resistance in a large Reynolds number turbulent state is not sufficient, especially for the various flow patterns. This study is devoted to investigating the influence of annular flow on the axial flow resistance of liquid in the coaxial cylinders of the stator and rotor in canned motor reactor coolant pumps, and predicting the coolant flow distribution between the upper coil cooling loop and lower bearing lubricating loop for safe operation. The axial flow resistance, coupled with the annular rotation, is experimentally investigated at a flow rate with an axial Reynolds number, Re a , from 2.6 × 10 3 to 6.0 × 10 3 and rotational Reynolds number, Re t , from 1.6 × 10 4 to 4.0 × 10 4. It is revealed that the axial flow frictional coefficient varies against the axial flow rate in linear relation sets with logarithmic coordinates, which shift up when the flow has a higher Re t. Further examination of the axial flow resistance, with the Re a extending to 3.5 × 10 5 and Re t up to 1.6 × 10 5 , by simulation shows gentle variation rates in the axial flow frictional coefficients against the Re a. The relation curves with different Re t values converge when the Re a exceeds 3.5 × 10 5. A prediction model for TCP flow consisting of a polygonal approximation with logarithmic coordinates is developed to estimate the axial flow resistance against different axial and rotational Reynolds numbers for the evaluation of heat and mass transfer during transition states and the engineering design of the canned motor chamber structure.

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Analytical thermal model and flow network analysis suitable for open self‐ventilated machines

Ghahfarokhi

Kallaste

Belahcen

et al. 2020

IET Electric Power Applications

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This study provides a survey on thermal and flow network analysis of open self-ventilated (OSV) machines. The improvements and new approaches proposed in the last decade are analysed in detail. The thermal analysis of OSV machines is divided into two significant steps, thermal models and flow network analysis. In the first step of this survey, the analytical thermal model approach is considered in detail. In addition, the study provides an overview of the critical parameters of an analytical thermal model and discusses different solutions to overcome the problems. In the second step, the hydraulic behaviour of OSV machines is considered by using the analytical flow network analysis and the formulation to calculate the flow network parameters is provided.

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An experimental study of rotational pressure loss in rotor-stator gap

Cited by 9 publications

References 17 publications

Review of the Analytical Flow Model to Predict the Hydraulic Behaviour in Electrical Machine

Review of the Analytical Flow Model to Predict the Hydraulic Behaviour in Electrical Machine

Flow Resistance Modeling for Coolant Distribution within Canned Motor Cooling Loops

Analytical thermal model and flow network analysis suitable for open self‐ventilated machines

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