Discharge Performance of Impinging Injector for Cavitating Flow

Cho, Won Kook;Ryu, Chul-Sung

  • Published : 2004.06.30


The discharge performance of an impinging-type injector for cavitating flow has been evaluated. The predicted discharge coefficient for cavitating flow agree s well with the measured data showing less than 2% discrepancy. For the case of non- cavitating flow analysis, the disagreement between CFD resu lts and the experimental data is 8%. The discharge coefficient for the cavitating flow decreases with decrea se in the Reynolds number. On the other hand, it increases slightly as the Reynolds number increases for the non-cavitating flow because of the reduced viscous effect. The incipience of cavitation is predicted to occur around the cavitation number of 1.3 for fixed Reynolds number flow. In this environment, the discharge performance is proportional to the cavitation number for cavitating flow while it is independent to the cavitation number for non-cavitating flow regime


impinging injector, cavitating flow, discharge performance, CFD-ACE


  1. G.S. Gill and W.H. Nuhck, Liquid rocket engine injectors, NASA SP-8089, 1976
  2. W.H. Nurick, Orifice cavitation and its effect on spray mixing, J. FIuids Eng., v98, pp.681-687, 1976
  3. R.A. Bunnell and S.D. Heister, Three-dimensional unsteady simulation of cavitating flows in injector passages, J. Ftuids Engng., v122, pp.791-797, 2000
  4. Won Kook Cho, Chul-Sung Ryu and Young-Mog Kim, Injector discharge characteristics of liquid rocket engine (in Korean), /. Korean Soc. ProPulsion Engineers, Vol. 5, No. 4, pp.12-19, 2001
  5. Won Kook Cho, Chul-Sung Ryu and Daesung Lee, Cavitating flow in an impinging-type injector (in Korean), J. Korean Society for Aeronauticctt and Space Sciences, v31, pp.80-86., 2003
  6. F. Numachi, M. Yamabe and R. Oba, Cavitation effect on the discharge coefficient of the sharp-edged orifice plate, J. Basic Engng., v82, pp.1-10, 1960
  7. CFD-ACE u6.4 manual. 2001