A Fundamental Study of the Supersonic Microjet Flow

초음속 마이크로 제트 유동에 관한 기초적 연구

  • 정미선 (안동대학교 기계공학과 대학원) ;
  • 김현섭 (안동대학교 기계공학과 대학원) ;
  • 김희동 (안동대학교 기계공학부) ;
  • 박종호 (충남대학교 기계공학과)
  • Published : 2002.03.01

Abstract

Computational modeling and simulation can provide an effective predictive capability for the major features of the supersonic microjets. In the present study, computations using the axisymmetic, compressible, Navier-Stokes equations are applied to understand the supersonic microjet flow physics. The pressure ratio of the microjets is changed between 0.2 and 1.25 to obtain both the under- and over-expanded flows at the exit of the micronozzle. and Reynolds number Re is changed between 600 to 40000. For both laminar and turbulent microjet flows, sonic and supersonic microjets are simulated and compared with some experimental results available. Based on computational results, two microjets are discussed in terms of total pressure, jet decay and supersonic core length.

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