Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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A COMPUTATIONAL STUDY ON THE CHARACTERISTICS OF FLOWFIELDS IN MICRONOZZLES

초소형 노즐 유동장에 관한 수치적 연구

  • 서지한 (한국항공우주산업(주) 비행역학팀) ;
  • 조현구 (경상대학교 기계항공공학부) ;
  • 이동호 (경상대학교 기계항공공학부) ;
  • 정성철 (충남대학교 항공우주공학과) ;
  • 명노신 (경상대학교 기계항공공학부 및 항공기부품기술연구소) ;
  • 허환일 (충남대학교 항공우주공학과)
  • Published : 2007.12.31
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Abstract

Owing to the rapid progress in manufacturing technology of microscale devices, there are active research works in developing microscale propulsion systems. In this study, gas flows in nozzles with size of milli and sub-millimeter are investigated by using a CFD code based on the Navier-Stokes equations. The prediction results were compared with theoretical results of quasi-one-dimensional nozzle flow and experiment data. In general, theoretical values agree very well with the CFD results. However, theoretical values begin to deviate from the CFD and experimental data for relatively small Reynolds numbers and the nozzle shape with rectangular cross section. The primary reason for this discrepancy is due to the existence of the thick boundary layer at the wall in low Reynolds flows.

Keywords

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