TY - JOUR
T1 - Effect of nozzle geometry on aggressivity of cavitating jet for cavitation erosion test and applications
AU - Nishimura, Satoshi
AU - Takakuwa, Osamu
AU - Soyama, Hitoshi
N1 - Funding Information:
This work was partially supported by the Cannon Foundation. The authors thank Mr. M. Mikami, technician, Tohoku University for his help in the experiment.
Publisher Copyright:
© Springer Science+Business Media Dordrecht 2014
PY - 2014
Y1 - 2014
N2 - In order to estimate cavitation erosion rate in hydraulic machinery the erosion resistance of materials can be investigated using a cavitating jet apparatus, standardized by ASTM G134. As the jet aggressivity is affected by the nozzle outlet geometry, this should also be considered to obtain reliable erosion tests. In this paper, we investigated the effects of the nozzle outlet geometry on the aggressivity of the cavitating jet by erosion tests, impact force measurements, and high-speed movie observations. The effect of Strouhal number, defined by the shedding frequency of the cavitation cloud, the width of the cavitating region, and the jet velocity, was also studied. The aggressivity of the cavitating jet peaked at a certain nozzle outlet bore, D, and outlet length, L. It was found that the Strouhal number, St, is 0.17 at the optimum D and L, even though the nozzle throat diameter d and injection pressure p1 were different. It was also revealed that the frequency of the large cavitation impact is closely related to the shedding frequency of the cavitation cloud.
AB - In order to estimate cavitation erosion rate in hydraulic machinery the erosion resistance of materials can be investigated using a cavitating jet apparatus, standardized by ASTM G134. As the jet aggressivity is affected by the nozzle outlet geometry, this should also be considered to obtain reliable erosion tests. In this paper, we investigated the effects of the nozzle outlet geometry on the aggressivity of the cavitating jet by erosion tests, impact force measurements, and high-speed movie observations. The effect of Strouhal number, defined by the shedding frequency of the cavitation cloud, the width of the cavitating region, and the jet velocity, was also studied. The aggressivity of the cavitating jet peaked at a certain nozzle outlet bore, D, and outlet length, L. It was found that the Strouhal number, St, is 0.17 at the optimum D and L, even though the nozzle throat diameter d and injection pressure p1 were different. It was also revealed that the frequency of the large cavitation impact is closely related to the shedding frequency of the cavitation cloud.
UR - http://www.scopus.com/inward/record.url?scp=84927661684&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84927661684&partnerID=8YFLogxK
U2 - 10.1007/978-94-017-8539-6_12
DO - 10.1007/978-94-017-8539-6_12
M3 - Article
AN - SCOPUS:84927661684
SN - 0926-5112
VL - 106
SP - 283
EP - 302
JO - Fluid Mechanics and its Applications
JF - Fluid Mechanics and its Applications
ER -