TY - JOUR
T1 - Influence of different blade numbers on the performance of “saddle zone” in a mixed flow pump
AU - Ji, Leilei
AU - Li, Wei
AU - Shi, Weidong
AU - Tian, Fei
AU - Li, Shuo
AU - Agarwal, Ramesh
N1 - Funding Information:
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The work was sponsored by the National Key R& D Program Project (No.2020YFC1512405), the Key International Cooperative research of National Natural Science Foundation of China (No.52120105010), National Natural Science Foundation of China (No.52179085), the Fifth “333 High Level Talented Person Cultivating Project” of Jiangsu Province, Funded projects of “Blue Project” in Jiangsu Colleges and Universities, “Belt and Road” Innovation Cooperation Project of Jiangsu Province (No.BZ2020068), Independent Innovation Fund Project of Agricultural Science and Technology in Jiangsu Province (No.CX(20)2037), Synergistic Innovation Center of Jiangsu on Modern Agricultural Equipment and Technology (No.4091600014).
Funding Information:
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The work was sponsored by the National Key R& D Program Project (No.2020YFC1512405), the Key International Cooperative research of National Natural Science Foundation of China (No.52120105010), National Natural Science Foundation of China (No.52179085), the Fifth ?333 High Level Talented Person Cultivating Project? of Jiangsu Province, Funded projects of ?Blue Project? in Jiangsu Colleges and Universities, ?Belt and Road? Innovation Cooperation Project of Jiangsu Province (No.BZ2020068), Independent Innovation Fund Project of Agricultural Science and Technology in Jiangsu Province (No.CX(20)2037), Synergistic Innovation Center of Jiangsu on Modern Agricultural Equipment and Technology (No.4091600014).
Publisher Copyright:
© IMechE 2021.
PY - 2022/5
Y1 - 2022/5
N2 - In order to study the effect of different numbers of impeller blades on the performance of mixed-flow pump “saddle zone”, the external characteristic test and numerical simulation of mixed-flow pumps with three different impeller blade numbers were carried out. Based on high-precision numerical prediction, the internal flow field and tip leakage flow field of mixed flow pump under design conditions and stall conditions are investigated. By studying the vorticity transport in the stall flow field, the specific location of the high loss area inside the mixed flow pump impeller with different numbers of blades is located. The research results show that the increase in the number of impeller blades improve the pump head and efficiency under design conditions. Compared to the 4-blade impeller, the head and efficiency of the 5-blade impeller are increased by 5.4% and 21.9% respectively. However, the increase in the number of blades also leads to the widening of the “saddle area” of the mixed-flow pump, which leads to the early occurrence of stall and increases the instability of the mixed-flow pump. As the mixed-flow pump enters the stall condition, the inlet of the mixed-flow pump has a spiral swirl structure near the end wall for different blade numbers, but the depth and range of the swirling flow are different due to the change in the number of blades. At the same time, the change in the number of blades also makes the flow angle at 75% span change significantly, but the flow angle at 95% span is not much different because the tip leakage flow recirculates at the leading edge. Through the analysis of the vorticity transport results in the impeller with different numbers of blades, it is found that the reasons for the increase in the values of the vorticity transport in the stall condition are mainly impacted by the swirl flow at the impeller inlet, the tip leakage flow at the leading edge and the increased unsteady flow structures.
AB - In order to study the effect of different numbers of impeller blades on the performance of mixed-flow pump “saddle zone”, the external characteristic test and numerical simulation of mixed-flow pumps with three different impeller blade numbers were carried out. Based on high-precision numerical prediction, the internal flow field and tip leakage flow field of mixed flow pump under design conditions and stall conditions are investigated. By studying the vorticity transport in the stall flow field, the specific location of the high loss area inside the mixed flow pump impeller with different numbers of blades is located. The research results show that the increase in the number of impeller blades improve the pump head and efficiency under design conditions. Compared to the 4-blade impeller, the head and efficiency of the 5-blade impeller are increased by 5.4% and 21.9% respectively. However, the increase in the number of blades also leads to the widening of the “saddle area” of the mixed-flow pump, which leads to the early occurrence of stall and increases the instability of the mixed-flow pump. As the mixed-flow pump enters the stall condition, the inlet of the mixed-flow pump has a spiral swirl structure near the end wall for different blade numbers, but the depth and range of the swirling flow are different due to the change in the number of blades. At the same time, the change in the number of blades also makes the flow angle at 75% span change significantly, but the flow angle at 95% span is not much different because the tip leakage flow recirculates at the leading edge. Through the analysis of the vorticity transport results in the impeller with different numbers of blades, it is found that the reasons for the increase in the values of the vorticity transport in the stall condition are mainly impacted by the swirl flow at the impeller inlet, the tip leakage flow at the leading edge and the increased unsteady flow structures.
KW - Mixed-flow pump
KW - number of blades
KW - stall
KW - tip leakage vortex
KW - vorticity transport
UR - http://www.scopus.com/inward/record.url?scp=85115017630&partnerID=8YFLogxK
U2 - 10.1177/09576509211046074
DO - 10.1177/09576509211046074
M3 - Article
AN - SCOPUS:85115017630
SN - 0957-6509
VL - 236
SP - 477
EP - 489
JO - Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
JF - Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
IS - 3
ER -