A Study on the Flow Characteristics with the Width of Annular Slit in Spiral Flow Nozzle

  • Kim, T.H. (Dept. of Mech. Eng., Pukyong Nat'l Univ.) ;
  • Setoguchi, T. (Dept. of Mech. Eng., Saga Univ.) ;
  • Lee, Y.W. (Dept. of Mech. Eng., Pukyong Nat'l Univ.)
  • Published : 2007.11.30


In comparison with previous researches for swirling flow, the spiral flow self-generated in the spiral flow nozzle has some different characteristics. It is not needed a compulsive tangential momentum to get its velocity component and has long potential core, relatively low swirl ratio, and high focusing ability. In this study, the self-generated mechanism of the spiral flow was clarified and the effect on the width of annular slit on spiral flow characteristics was investigated experimentally and numerically. As a result, the existence of tangential velocity component regardless of a compulsive angular momentum is clarified and the results obtained by experiment have a satisfactory agreement with those by numerical method, quantitatively and qualitatively.