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Thermographie infrarouge et étude numérique du transfert de chaleur conjugué dans un compresseur Roots. 

Infrared-thermography and numerical investigation of conjugate heat transfer in roots blower.

Numéro : 1111

Auteurs : PATEL B., RANE S., KOVACEVIC A.

Résumé

In Positive displacement machines, operating temperature of the gas is different than the rotor and casing temperatures, causing heat to flow from gas to rotors and casing and vice versa. Thermal expansion of the machine components which occurs at high speed, changes operating clearances between rotors and the casing. This leads to deterioration of efficiency and reliability of the machine. The present research work focuses on both, the experimental study of heat transfer at the rotor surface during the operation of the machine and on development and validation of CFD models. The heat transfer phenomenon between solid and fluid is treated in the numerical model as conjugate heat transfer (CHT). An experimental study on an optically accessible roots blower is performed using a high-speed infrared thermography system. Required optical access on the machine is constructed from sapphire glass. National Instrument-based data acquisition system is designed to achieve phase-lock synchronization of the camera exposure with the rotation angle of the lobe. This system is also extended to measure and control machine operating parameters such as pressure, temperature, flow, power, and speed. A CFD model of the experimental Roots Blower was evaluated with fluid flow and conjugate heat transfer. Additional complexity of the model involved deforming rotor grids and in-house tool SCORG was used for this purpose. Results of steady state lobe surface temperature and housing external temperature have been verified in the numerical model at various operating conditions. This CHT model will be used in future to evaluate design modification and conceptualize methods for reduction in leakage losses and ensure reliable operation of the machine.

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Pages : 10 p.

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Détails

  • Titre original : Infrared-thermography and numerical investigation of conjugate heat transfer in roots blower.
  • Identifiant de la fiche : 30030261
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Date d'édition : 15/07/2022

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