International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023
p-ISSN: 2395-0072
www.irjet.net
Ansys-CFX analysis to design the diffuser of a multistage pump Ajay Chouhan1, Purushottam Sahu 2, Ghanshyam Dhanera 3 1Research scholar, BM College of Technology, Indore, MP
2Professor and Head Department of mechanical engineering, College of Technology, Indore, MP 3Professor, Department of mechanical engineering, College of Technology, Indore, MP
---------------------------------------------------------------------***--------------------------------------------------------------------A pump is a mechanical device used to transport fluids Abstract -Multistage pumps, consisting of a series of
from one place to another. It works by creating a pressure difference that propels the fluid through a system. Pumps are widely used in various industries, including water supply, oil and gas, chemical processing, and wastewater treatment.
impellers connected on a single shaft, play a significant role in global power usage. These pumps are commonly employed for transferring fluids with high head requirements and find applications in various industries, hydro storage energy plants, mine dewatering, and boiler feeding. To ensure economic viability and energy conservation, it is crucial to assess the performance and head loss of multistage pumps. One critical component of these pumps is the diffuser, which increases the fluid pressure as it exits the impeller at high velocity. This study focuses on evaluating the impact of the number of vanes in the diffuser on pump performance and head loss under different operating conditions. Computational fluid dynamics (CFD) is employed for the analysis, utilizing 3D models created using Creo Parametric software for different fluid domains of a two-stage pump. The components are individually meshed using ICEM-CFD, and simulation setup is performed using CFX-Pre software. The Ansys CFX solver is used to solve the flow equations, and CFD-Post is employed to acquire pump fluid flow details, calculate various heads, head losses, and other parameters.
There are different types of pumps, such as centrifugal pumps, positive displacement pumps, and axial flow pumps. Centrifugal pumps are the most common and work by using an impeller to generate centrifugal force, pushing the fluid outward. Positive displacement pumps, on the other hand, use a mechanism to trap and transport fluid in discrete volumes. Axial flow pumps operate by propelling fluid parallel to the pump shaft. Pumps play a critical role in many applications, including water distribution, irrigation, heating and cooling systems, fuel transportation, and industrial processes. They come in various sizes and capacities to meet specific requirements. Efficient pump design, maintenance, and operation are essential to ensure optimal performance and energy efficiency.
Key Words: CFX-Pre software, Computational fluid
Pumps can be classified into different categories based on various factors such as their principle of operation, fluid handling capabilities, and design characteristics. Here are some common classifications of pumps:
dynamic, Diffuser, Multistage pump, Impellers.
1.INTRODUCTION In the current era of rapid industrialization and a fastpaced world, the efficient supply of fluid with high head requirements is essential for numerous applications. Multistage pumps have emerged as a popular choice for such tasks, given their ability to handle high-head fluid transfer. Conducting performance analysis and studying head losses in these pumps not only brings economic benefits but also contributes to energy conservation, considering the significant share (approximately 22 percent) [2] of global energy consumption attributed to multistage pumps. Therefore, this study aims to assess the behavior of head losses in different components of a multistage pump, particularly focusing on the impact of the number of vanes in the diffuser, across various operating conditions. The investigation involves a numerical simulation analysis of a two-stage centrifugal pump, followed by a comprehensive study of head losses and performance parameters.
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Based on Principle of Operation:
Centrifugal Pumps: These pumps use centrifugal force generated by a rotating impeller to move fluid. They are widely used for low to medium viscosity fluids and high flow rates. Positive Displacement Pumps: These pumps trap and transport fluid in discrete volumes, creating a pulsating flow. They are suitable for high viscosity fluids and applications requiring precise flow control. Axial Flow Pumps: These pumps move fluid parallel to the pump shaft, using propeller-like blades. They are suitable for high flow rates and low to medium head applications.
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