Conjugate heat transfer analysis of a salient pole rotor in an air cooled synchronous generator

Shanel, M.; Pickering, Simon; Lampard, D.

doi:10.1109/iemdc.2003.1210318

Cited by 26 publications

(14 citation statements)

References 2 publications

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“…It is thought that the strong pressure gradient, caused by the rotor pole pumping effect, drives this flow [12]. Mesh insensitivity is due to the strong velocities in the vent causing less chance for recirculation or skewed flows.…”

Section: Rotor Vent Flowmentioning

confidence: 99%

See 1 more Smart Citation

Stator and rotor vent modelling in a MVA rated synchronous machine

Connor¹,

Eastwick²,

Pickering

et al. 2016

2016 XXII International Conference on Electrical Machines (ICEM)

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-An investigation into the solution dependence of a conjugate heat transfer computational fluid dynamics (CFD) model of a synchronous generator, with respect to meshing, has been carried out. Utilising CFD as a tool for investigating the airflow and thermal performance of electrical machines is increasing. Meshing is a vital part of the CFD process, but its importance is often misunderstood or overlooked in the context of electrical machine analyses; partly due to the relative mesh independency of the finite element analysis (FEA) numerical method. This paper demonstrates how a relatively complex, aircooled generator CFD model can be considerably influenced by changes in the mesh. Flow rate, velocity and windage effects are assessed as a function of the mesh adopted. Mesh changes have been shown to affect the mass flow rate through a single vent by up to 55% and the associated heat transfer coefficient by 128%.

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Section: Rotor Vent Flowmentioning

confidence: 99%

“…Whether CFD is being used to model only flow, to extract heat transfer coefficients to be implemented in LPTN or FEA modelling [5], or for integral conjugate heat transfer analysis [12], the correct airflow model is required as the foundation for the thermal model. CFD modelling of electrical machine airgap regions is well understood.…”

Section: Introductionmentioning

confidence: 99%

Stator and rotor vent modelling in a MVA rated synchronous machine

Connor¹,

Eastwick²,

Pickering

et al. 2016

2016 XXII International Conference on Electrical Machines (ICEM)

View full text Add to dashboard Cite

show abstract

“…Key value is the temperature on isolation-conductor contact, because heat is generated in conductors due to the Joule's losses. 3D finite element model would give temperature distribution on rotor if geometry, materials, and total heat power is known ( [3], [4], [5], [6], [7], [8]). …”

Section: Introductionmentioning

confidence: 99%

Application of IR thermography to mesurements on synchronous hydrogenerator in rotation

Stipetić¹,

Hanić²,

Vražić³

2010

Proceedings of the 2010 International Conference on Quantitative InfraRed Thermography

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Synchronous generator is the most common generator type used in power systems. Modern control and diagnostic systems require information of the excitation winding temperature. This winding is located on the rotor and therefore conventional temperature measurement requires slip-rings or wireless data transfer. IR thermography can be used to obtain average temperature of the surface of excitation winding while rotating and 3D FEM models can give temperature distribution. Laboratory model included synchronous hydro-generator (400 kW), IR thermometer and Bluetooth ® wireless temperature acquisition system with temperature sensors placed on rotor. Two measurement systems were compared and experimental results are presented.

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“…It was concluded that CFD can be used to provide valuable insight into the air flow and heat transfer in salient pole machines, which in turn can aid the machine design. Shanel et al [4] investigated the heat transfer and ventilation of an aircooled generator by using a general purpose CFD code in a simplified generator design. They concluded that CFD analysis can be used effectively to predict temperatures in electrical machines by combining conduction heat transfer with airflow and convective heat transfer modeling.…”

Section: Introductionmentioning

confidence: 99%

“…Overall, the heat transfer at the end windings or the flow field inside the stator ducts can barely be computed using thermal networks, while the application of three-dimensional numerical methods makes these predictions possible. CFD offers a good potential to fully predict ventilation and cooling in generators [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. CFD has the advantage that it can be used to predict the flow and heat transfer in complex regions, without case-specific empirical correlations.…”

Section: Introductionmentioning

confidence: 99%

CFD-based Design and Analysis of the Ventilation of an Electric Generator Model, Validated with Experiments

Jamshidi

Nilsson

Chernoray

2015

International Journal of Fluid Machinery and Systems

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The efficiency of the ventilation system is a key point for durable and reliable electric generators. The design of such system requires a detailed understanding of the air flow in the generator. Computational fluid dynamics (CFD) has the potential to resolve the lack of information in this field. The present work analyses the air flow inside a generator model. The model is designed using a CFD-based approach, and manufactured by taking into consideration the experimental and numerical requirements and limitations. The emphasis is on the possibility to accurately predict and experimentally measure the flow distribution inside the stator channels. A major part of the work is focused on the design of an intake and a fan that gives an evenly distributed flow with a high flow rate. The intake also serves as an accurate flowmeter. Experimental results are presented, of the total volume flow rate, the total pressure and velocity distributions. Steadystate CFD simulations are performed using the FOAM-extend CFD toolbox. The simulations are based on the multiple rotating reference frames method. The results from the frozen rotor and mixing plane rotor-stator coupling approaches are compared. It is shown that the fan design provides a sufficient flow rate for the stator channels, which is not the case without the fan or with a previous fan design. The detailed experimental and numerical results show an excellent agreement, proving that the results reliable.

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Conjugate heat transfer analysis of a salient pole rotor in an air cooled synchronous generator

Cited by 26 publications

References 2 publications

Stator and rotor vent modelling in a MVA rated synchronous machine

Stator and rotor vent modelling in a MVA rated synchronous machine

Application of IR thermography to mesurements on synchronous hydrogenerator in rotation

CFD-based Design and Analysis of the Ventilation of an Electric Generator Model, Validated with Experiments

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