TY - JOUR
T1 - Experimental study of discharge coefficient and cavitation for different nozzle geometries
AU - Kim, Sung Ryoul
AU - Ku, Kun Woo
AU - Hong, Jung Goo
AU - Lee, Choong Won
PY - 2010/10
Y1 - 2010/10
N2 - The purpose of this study is to investigate the generation and development of cavitation in circular and elliptical nozzles. In order to investigate the influence of cavitation, the experiment was conducted with a set of elliptical nozzles that had the same cross-sectional area, different orifice aspect ratios (a/b). Each nozzle was made of acrylic so that visualization was possible. With the injection pressure, the internal flow of the nozzle was classified into the no-cavitation, cavitation, and hydraulic-flip regions. Regardless of the nozzle geometry, with the injection pressure, the flow rate in the no-cavitation and cavitation regions increased and the discharge coefficient decreased. However, the flow rate was constant in the hydraulic-flip region. In the elliptical nozzles, the generation and development of cavitation occurred at higher cavitation number than that in the case of a circular nozzle.
AB - The purpose of this study is to investigate the generation and development of cavitation in circular and elliptical nozzles. In order to investigate the influence of cavitation, the experiment was conducted with a set of elliptical nozzles that had the same cross-sectional area, different orifice aspect ratios (a/b). Each nozzle was made of acrylic so that visualization was possible. With the injection pressure, the internal flow of the nozzle was classified into the no-cavitation, cavitation, and hydraulic-flip regions. Regardless of the nozzle geometry, with the injection pressure, the flow rate in the no-cavitation and cavitation regions increased and the discharge coefficient decreased. However, the flow rate was constant in the hydraulic-flip region. In the elliptical nozzles, the generation and development of cavitation occurred at higher cavitation number than that in the case of a circular nozzle.
KW - Discharge coefficient cavitation number
KW - Elliptical nozzle
KW - Nozzle cavitations
UR - http://www.scopus.com/inward/record.url?scp=77958523239&partnerID=8YFLogxK
U2 - 10.3795/KSME-B.2010.34.10.933
DO - 10.3795/KSME-B.2010.34.10.933
M3 - Article
AN - SCOPUS:77958523239
SN - 1226-4881
VL - 34
SP - 933
EP - 939
JO - Transactions of the Korean Society of Mechanical Engineers, B
JF - Transactions of the Korean Society of Mechanical Engineers, B
IS - 10
ER -