TY - JOUR
T1 - Investigation of deflector effect on cavitation in an axisymmetric gate slot by means of AE measurement
AU - Shintani, Masayuki
AU - Truong, Anh Viet
AU - Iga, Yuka
AU - Ikohagi, Toshiaki
PY - 2011
Y1 - 2011
N2 - To take up the three-dimensional axisymmetric gate slot concerining with the gate slot possessed in hydraulic equipment, such as, a gate valve, the state of cavitation of the gate slot was investigated by Acoustic Emisson (AE) measurement. The relationship between AE energy level and cavitation condition was analyzed by the root-mean-square (RMS) of acoustic wave. Moreover, a new AE parameter "relative accumulated intensity•• (RAI)" was defined in order to estimate the erosion tendency of cavitation. Combining with the result of impulsive pressure measurement, the relationship between the erosive damage and the high amplitude generation of AE wave is confirmed by using RAI. In consideration of deflector effect, the AE measurement showed that the conical shape installed on the upstream side of gate slot makes the cavitation erosion increased, and the offset shape on the downstream side of gate slot makes the cavitation erosion decreased significantly.
AB - To take up the three-dimensional axisymmetric gate slot concerining with the gate slot possessed in hydraulic equipment, such as, a gate valve, the state of cavitation of the gate slot was investigated by Acoustic Emisson (AE) measurement. The relationship between AE energy level and cavitation condition was analyzed by the root-mean-square (RMS) of acoustic wave. Moreover, a new AE parameter "relative accumulated intensity•• (RAI)" was defined in order to estimate the erosion tendency of cavitation. Combining with the result of impulsive pressure measurement, the relationship between the erosive damage and the high amplitude generation of AE wave is confirmed by using RAI. In consideration of deflector effect, the AE measurement showed that the conical shape installed on the upstream side of gate slot makes the cavitation erosion increased, and the offset shape on the downstream side of gate slot makes the cavitation erosion decreased significantly.
KW - AE
KW - Axisymmetric gate slot
KW - Cavitation
KW - Conical
KW - Deflector
KW - Erosion
KW - Offset
KW - Pipe flow
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U2 - 10.1299/kikaib.77.1210
DO - 10.1299/kikaib.77.1210
M3 - Article
AN - SCOPUS:84859620319
SN - 0387-5016
VL - 77
SP - 1210
EP - 1218
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
IS - 777
ER -