The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform

Pierrick Lotton - One of the best experts on this subject based on the ideXlab platform.

  • Active control of thermoacoustic amplification in a thermo-acousto-Electric Engine
    Journal of Applied Physics, 2014
    Co-Authors: Come Olivier, Gaelle Poignand, Guillaume Penelet, Pierrick Lotton
    Abstract:

    In this paper, a new approach is proposed to control the operation of a thermoacoustic Stirling Electricity generator. This control basically consists in adding an additional acoustic source to the device, connected through a feedback loop to a reference microphone, a phase-shifter, and an audio amplifier. Experiments are performed to characterize the impact of the feedback loop (and especially that of the controlled phase-shift) on the overall efficiency of the thermal to Electric energy conversion performed by the Engine. It is demonstrated that this external forcing of thermoacoustic self-sustained oscillations strongly impacts the performance of the Engine, and that it is possible under some circumstances to improve the efficiency of the thermo-Electric transduction, compared to the one reached without active control. Applicability and further directions of investigation are also discussed.

  • Active control of thermoacoustic amplification in a thermo-acousto-Electric Engine
    2013
    Co-Authors: Come Olivier, Gaelle Poignand, Guillaume Penelet, Pierrick Lotton
    Abstract:

    In this paper, a new approach is proposed to control the thermoacoustic amplification in a traveling-wave thermoacoustic Engine. Based on the assumption that the spatial distribution of the self-established acoustic field in a stabilized regime does not necessary have the optimal shape for the most efficient thermal-to-acoustic conversion, this method uses an auxiliary acoustic source with a feedback loop applied on a thermo-acousto-Electric transducer to improve its overall efficiency. After a brief presentation of the Engine and its capabilities without any form of control, the preliminary results of an experimental study under various conditions are shown to demonstrate the possibility of a significant improvement in the thermoacoustic conversion with an appropriate tuning of the control parameters of the feedback loop. Applicability and further directions of investigation are also discussed.

Silvio Vaschetto - One of the best experts on this subject based on the ideXlab platform.

  • Conjugate Heat Transfer Analysis of Integrated Brushless Generators for More Electric Engines
    IEEE Transactions on Industry Applications, 2014
    Co-Authors: Marco Tosetti, Paolo Maggiore, Andrea Cavagnino, Silvio Vaschetto
    Abstract:

    In this paper, a complete conjugate heat transfer analysis of a scaled-sized prototype of an integrated air-cooled surface-mounted permanent-magnet generator for the “more-Electric Engine” application is presented. The selected integration position inside the aircraft's main gas turbine Engine imposes the use of an unconventional cooling system, where the coolant directly flows through the machine air gap. To predict and prevent the critical working conditions of the prototype, the adopted cooling system has been investigated using a complete fluid-thermal analysis. Due to the capabilities of computational fluid dynamic software, it has been possible to analyze the temperature and flow fields inside the machine, giving an idea about the distribution of the thermal quantities both inside the solid materials and above the surfaces. The numerical model validation has been provided, comparing computed and experimental results, i.e., imposing the same working conditions, the predicted temperatures satisfactorily agree with the measured temperatures.

  • Integrated Generator for More Electric Engine: Design and Testing of a Scaled-Size Prototype
    IEEE Transactions on Industry Applications, 2013
    Co-Authors: Andrea Cavagnino, Alberto Tenconi, Silvio Vaschetto
    Abstract:

    In this paper, the main design characteristics of a scaled-size prototype of an integrated generator for More Electric Engine application are presented. The reference Electrical machine is a surface-mounted permanent-magnet machine directly integrated inside the aircraft main gas turbine Engine. Therefore, as for the reference machine, the designed scaled-size prototype is characterized by an annulus-shape outer-rotor structure, and it is cooled by air flowing through the airgap. To satisfy the fault-tolerant requirements imposed by the aerospace application, the stator winding is constituted by multiphase single-layer nonoverlapping fractional-slot concentrated windings. In order to validate the designed machine, the experimental results of tests conducted on the prototype are reported. Among these ones, particular interest is focused on the cooling capabilities of the cooling air which flows through the machine airgap. Furthermore, based on the reduced-scale prototype experience, some considerations and the main design characteristics of the full-size machine design are reported too.

  • Conjugate heat transfer analysis of integrated brushless generators for more Electric Engines
    2013 IEEE Energy Conversion Congress and Exposition, 2013
    Co-Authors: Marco Tosetti, Paolo Maggiore, Andrea Cavagnino, Silvio Vaschetto
    Abstract:

    In the paper a complete conjugate heat transfer analysis of a scaled-size prototype of an integrated, air-cooled, surface mounted, PM generator for “More Electric Engine” application is presented. The selected integration position inside the aircraft main gas turbine Engine imposes the use of a unconventional cooling system, where the coolant directly flows through the machine airgap. To predict and prevent critical working conditions of the prototype, the adopted cooling system has been investigated by means of a complete fluid-thermal analysis. Thanks to the capabilities of computational fluid dynamic software, it has been possible to analyze the temperatures and flow fields inside the machine, giving an idea of the distribution of thermal quantities both inside the solid materials and above the surfaces. The numerical model validation has been provided comparing computed and experimental results: imposing the same working conditions, the predicted temperatures satisfactory agree with the measured ones.

  • Integrated generator for more Electric Engine: Design and testing of a scaled size prototype
    2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012
    Co-Authors: Andrea Cavagnino, Alberto Tenconi, Zijian Li, Silvio Vaschetto
    Abstract:

    In this paper the main design characteristics of a scaled-size prototype of an integrated generator for More Electric Engine (MEE) application are presented. The reference Electrical machine is a surface mounted PM machine directly integrated inside the aircraft main gas turbine Engine. Therefore, as for the reference machine, the designed scaled-size prototype is characterized by an annulus shape outer rotor structure and it is cooled by air flowing through the airgap. To satisfy the fault-tolerant requirements imposed by the aerospace application, the stator winding is constituted by multiphase single-layer non-overlapping fractional-slot concentrated windings. In order to validate the designed machine, the experimental results of tests conducted on the prototype are reported. Among these ones, particular interest is focused on the cooling capabilities of the cooling air which flow through the machine airgap. Furthermore, based on the reduced scale prototype experience, some considerations and the main design characteristics of the full-size machine design are reported too.

  • Eddy current losses reduction in fractional slot concentrated winding PM generators for More Electric Engine application
    2011 International Conference on Clean Electrical Power (ICCEP), 2011
    Co-Authors: Andrea Cavagnino, Alberto Tenconi, Alessio Miotto, Silvio Vaschetto
    Abstract:

    The aerospace trend is towards the More Electric Aircraft (MEA), which consists in the progressive electrification of the main on-board systems and services. The resulting increase of the aircraft Electrical loading involves significant implications for on-board Electrical generation systems, realizing the so-called More Electric Engine (MEE). In the MEE concept the Electrical generators are integrated inside the main gas turbine Engine to generate Electrical power. In the paper the magnet losses of a surface mounted Permanent Magnet (PM) generator with non-overlapping fractional-slot concentrated windings, positioned in the front stage of the gas turbine Engine, are evaluated. The benefits of the magnet segmentation aimed to the machine rotor losses reduction are investigated by means of a Finite Element Method analyses. The permanent magnet segmentation effects on machine performance and cogging torque are put in evidence too.

Come Olivier - One of the best experts on this subject based on the ideXlab platform.

  • Active control of thermoacoustic amplification in a thermo-acousto-Electric Engine
    Journal of Applied Physics, 2014
    Co-Authors: Come Olivier, Gaelle Poignand, Guillaume Penelet, Pierrick Lotton
    Abstract:

    In this paper, a new approach is proposed to control the operation of a thermoacoustic Stirling Electricity generator. This control basically consists in adding an additional acoustic source to the device, connected through a feedback loop to a reference microphone, a phase-shifter, and an audio amplifier. Experiments are performed to characterize the impact of the feedback loop (and especially that of the controlled phase-shift) on the overall efficiency of the thermal to Electric energy conversion performed by the Engine. It is demonstrated that this external forcing of thermoacoustic self-sustained oscillations strongly impacts the performance of the Engine, and that it is possible under some circumstances to improve the efficiency of the thermo-Electric transduction, compared to the one reached without active control. Applicability and further directions of investigation are also discussed.

  • Active control of thermoacoustic amplification in a thermo-acousto-Electric Engine
    2013
    Co-Authors: Come Olivier, Gaelle Poignand, Guillaume Penelet, Pierrick Lotton
    Abstract:

    In this paper, a new approach is proposed to control the thermoacoustic amplification in a traveling-wave thermoacoustic Engine. Based on the assumption that the spatial distribution of the self-established acoustic field in a stabilized regime does not necessary have the optimal shape for the most efficient thermal-to-acoustic conversion, this method uses an auxiliary acoustic source with a feedback loop applied on a thermo-acousto-Electric transducer to improve its overall efficiency. After a brief presentation of the Engine and its capabilities without any form of control, the preliminary results of an experimental study under various conditions are shown to demonstrate the possibility of a significant improvement in the thermoacoustic conversion with an appropriate tuning of the control parameters of the feedback loop. Applicability and further directions of investigation are also discussed.

Andrea Cavagnino - One of the best experts on this subject based on the ideXlab platform.

  • Conjugate Heat Transfer Analysis of Integrated Brushless Generators for More Electric Engines
    IEEE Transactions on Industry Applications, 2014
    Co-Authors: Marco Tosetti, Paolo Maggiore, Andrea Cavagnino, Silvio Vaschetto
    Abstract:

    In this paper, a complete conjugate heat transfer analysis of a scaled-sized prototype of an integrated air-cooled surface-mounted permanent-magnet generator for the “more-Electric Engine” application is presented. The selected integration position inside the aircraft's main gas turbine Engine imposes the use of an unconventional cooling system, where the coolant directly flows through the machine air gap. To predict and prevent the critical working conditions of the prototype, the adopted cooling system has been investigated using a complete fluid-thermal analysis. Due to the capabilities of computational fluid dynamic software, it has been possible to analyze the temperature and flow fields inside the machine, giving an idea about the distribution of the thermal quantities both inside the solid materials and above the surfaces. The numerical model validation has been provided, comparing computed and experimental results, i.e., imposing the same working conditions, the predicted temperatures satisfactorily agree with the measured temperatures.

  • Integrated Generator for More Electric Engine: Design and Testing of a Scaled-Size Prototype
    IEEE Transactions on Industry Applications, 2013
    Co-Authors: Andrea Cavagnino, Alberto Tenconi, Silvio Vaschetto
    Abstract:

    In this paper, the main design characteristics of a scaled-size prototype of an integrated generator for More Electric Engine application are presented. The reference Electrical machine is a surface-mounted permanent-magnet machine directly integrated inside the aircraft main gas turbine Engine. Therefore, as for the reference machine, the designed scaled-size prototype is characterized by an annulus-shape outer-rotor structure, and it is cooled by air flowing through the airgap. To satisfy the fault-tolerant requirements imposed by the aerospace application, the stator winding is constituted by multiphase single-layer nonoverlapping fractional-slot concentrated windings. In order to validate the designed machine, the experimental results of tests conducted on the prototype are reported. Among these ones, particular interest is focused on the cooling capabilities of the cooling air which flows through the machine airgap. Furthermore, based on the reduced-scale prototype experience, some considerations and the main design characteristics of the full-size machine design are reported too.

  • Conjugate heat transfer analysis of integrated brushless generators for more Electric Engines
    2013 IEEE Energy Conversion Congress and Exposition, 2013
    Co-Authors: Marco Tosetti, Paolo Maggiore, Andrea Cavagnino, Silvio Vaschetto
    Abstract:

    In the paper a complete conjugate heat transfer analysis of a scaled-size prototype of an integrated, air-cooled, surface mounted, PM generator for “More Electric Engine” application is presented. The selected integration position inside the aircraft main gas turbine Engine imposes the use of a unconventional cooling system, where the coolant directly flows through the machine airgap. To predict and prevent critical working conditions of the prototype, the adopted cooling system has been investigated by means of a complete fluid-thermal analysis. Thanks to the capabilities of computational fluid dynamic software, it has been possible to analyze the temperatures and flow fields inside the machine, giving an idea of the distribution of thermal quantities both inside the solid materials and above the surfaces. The numerical model validation has been provided comparing computed and experimental results: imposing the same working conditions, the predicted temperatures satisfactory agree with the measured ones.

  • Integrated generator for more Electric Engine: Design and testing of a scaled size prototype
    2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012
    Co-Authors: Andrea Cavagnino, Alberto Tenconi, Zijian Li, Silvio Vaschetto
    Abstract:

    In this paper the main design characteristics of a scaled-size prototype of an integrated generator for More Electric Engine (MEE) application are presented. The reference Electrical machine is a surface mounted PM machine directly integrated inside the aircraft main gas turbine Engine. Therefore, as for the reference machine, the designed scaled-size prototype is characterized by an annulus shape outer rotor structure and it is cooled by air flowing through the airgap. To satisfy the fault-tolerant requirements imposed by the aerospace application, the stator winding is constituted by multiphase single-layer non-overlapping fractional-slot concentrated windings. In order to validate the designed machine, the experimental results of tests conducted on the prototype are reported. Among these ones, particular interest is focused on the cooling capabilities of the cooling air which flow through the machine airgap. Furthermore, based on the reduced scale prototype experience, some considerations and the main design characteristics of the full-size machine design are reported too.

  • Eddy current losses reduction in fractional slot concentrated winding PM generators for More Electric Engine application
    2011 International Conference on Clean Electrical Power (ICCEP), 2011
    Co-Authors: Andrea Cavagnino, Alberto Tenconi, Alessio Miotto, Silvio Vaschetto
    Abstract:

    The aerospace trend is towards the More Electric Aircraft (MEA), which consists in the progressive electrification of the main on-board systems and services. The resulting increase of the aircraft Electrical loading involves significant implications for on-board Electrical generation systems, realizing the so-called More Electric Engine (MEE). In the MEE concept the Electrical generators are integrated inside the main gas turbine Engine to generate Electrical power. In the paper the magnet losses of a surface mounted Permanent Magnet (PM) generator with non-overlapping fractional-slot concentrated windings, positioned in the front stage of the gas turbine Engine, are evaluated. The benefits of the magnet segmentation aimed to the machine rotor losses reduction are investigated by means of a Finite Element Method analyses. The permanent magnet segmentation effects on machine performance and cogging torque are put in evidence too.

Guillaume Penelet - One of the best experts on this subject based on the ideXlab platform.

  • Active control of thermoacoustic amplification in a thermo-acousto-Electric Engine
    Journal of Applied Physics, 2014
    Co-Authors: Come Olivier, Gaelle Poignand, Guillaume Penelet, Pierrick Lotton
    Abstract:

    In this paper, a new approach is proposed to control the operation of a thermoacoustic Stirling Electricity generator. This control basically consists in adding an additional acoustic source to the device, connected through a feedback loop to a reference microphone, a phase-shifter, and an audio amplifier. Experiments are performed to characterize the impact of the feedback loop (and especially that of the controlled phase-shift) on the overall efficiency of the thermal to Electric energy conversion performed by the Engine. It is demonstrated that this external forcing of thermoacoustic self-sustained oscillations strongly impacts the performance of the Engine, and that it is possible under some circumstances to improve the efficiency of the thermo-Electric transduction, compared to the one reached without active control. Applicability and further directions of investigation are also discussed.

  • Active control of thermoacoustic amplification in a thermo-acousto-Electric Engine
    2013
    Co-Authors: Come Olivier, Gaelle Poignand, Guillaume Penelet, Pierrick Lotton
    Abstract:

    In this paper, a new approach is proposed to control the thermoacoustic amplification in a traveling-wave thermoacoustic Engine. Based on the assumption that the spatial distribution of the self-established acoustic field in a stabilized regime does not necessary have the optimal shape for the most efficient thermal-to-acoustic conversion, this method uses an auxiliary acoustic source with a feedback loop applied on a thermo-acousto-Electric transducer to improve its overall efficiency. After a brief presentation of the Engine and its capabilities without any form of control, the preliminary results of an experimental study under various conditions are shown to demonstrate the possibility of a significant improvement in the thermoacoustic conversion with an appropriate tuning of the control parameters of the feedback loop. Applicability and further directions of investigation are also discussed.