International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023
p-ISSN: 2395-0072
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Optimization and Cavitation Analysis of Centrifugal Pump with Variable Working Parameters Using Ansys CFX Nishant Kundu1, Preetham A2 1B.tech, Dept of Mechanical Engineering, NIT Kurukshetra
1VD Engineer, SAE B.tech, Dept of Mechanical Engineering, NIT Kurukshetra
---------------------------------------------------------------------***--------------------------------------------------------------------playing a crucial role in its operation. Fig.1.1 provides a Abstract –
detailed diagram of a centrifugal pump, highlighting the key elements that contribute to its operation, including the eye, impeller, volute casing, suction pipe, shaft, and delivery pipe.
Centrifugal pumps are widely used in a variety of applications. However, their performance can be affected by a number of factors, including rotation speed (RPM), mass flow rate, blade number, and blade geometry. This study used computational fluid dynamics (CFD) to investigate the impact of these factors on the internal flow behavior of a centrifugal pump. The results showed that increasing the RPM led to higher output pressure, power output, and head rise, but also decreased efficiency due to heightened turbulence and frictional losses. The mass flow rate was also found to be a critical factor, with excessive flow rates leading to overloading and power losses, while insufficient flow rates resulted in diminished performance and overall efficiency. The blade number and geometry were also found to have a significant impact on flow behavior. Initially, a higher blade number enhanced efficiency by facilitating more efficient power transfer to the fluid. However, beyond a threshold of eight blades, diminishing returns were observed due to complex flow patterns and increased losses. Notably, blade geometry played a pivotal role, with the outlet blade angle exhibiting substantial influence on parameters such as efficiency and output pressure, while the inlet blade angle had limited significance.
Fig.1.1 Various Components of Centrifugal Pump [7] Several studies have focused on different aspects of centrifugal pumps, contributing to the understanding and improvement of their design and performance. Raut et al [1] explored the utilization of Ansys CFX for simulations, emphasizing geometry selection and the advantages of using the Ansys component system Vista CPD. Elida et al [2] provided insights into impeller geometry creation, meshing, and boundary condition implementation. Muttali et al. [3] analyzed the operating characteristics of centrifugal pumps, including the head-flow rate relationship and the impact of RPM on cavitation. Sun et al. [4] investigated the influence of rotational speed and flow rate variations on performance parameters. Bhupatni et al. [5] studied the effects of inlet and outlet blade angle variations on head and efficiency. Tabar et al. [8] developed a procedure for cavitation analysis in centrifugal pumps and validated it through impeller damage comparison. Jaiswal et al. [9] examined the relationship between Net Positive Suction Head (NPSH) and cavitation, proposing a cavitation model. These studies collectively contribute to the understanding, design, and performance optimization of centrifugal pumps, benefiting various industrial applications.
Overall, this study provides valuable insights into the internal flow characteristics of centrifugal pumps. The findings of this study have a number of implications for the design and operation of centrifugal pumps and could also be used to improve efficiency and reliability in practical applications. The results could be used to design pumps that are more resistant to cavitation and also to develop new methods for optimizing the performance of centrifugal pumps. Key Words: Centrifugal Pump, Ansys CFX, Vista CPD, CFD Analysis, CFD Post Processor, Stimulation, Component Systems, Cavitation.
1. INTRODUCTION Centrifugal pumps, as fascinating hydraulic machines, can convert mechanical energy into hydraulic energy by harnessing the power of centrifugal force. By leveraging this force upon a fluid, these pumps induce velocity, which is subsequently transformed into a flowing motion. The intricate workings of a centrifugal pump are made possible through an assembly of mechanical components, each
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