Large thermal power facilities typically utilise mixed flow pumps for cooling water tasks. The radial and axial properties of the mixed flow pump are combined. The well-established empirical methods of designing radial flow impellers are directly applied to the design of mixed flow impellers with high specific speeds. The development of almost diagonal flow arrangement at an even higher specific speed prompted the incorporation of axial pump impeller design approaches in mixed flow pump technology. Similar methods are extended for the design of mixed flow impellers.
The standard industrial
procedure for mixed flow pump impeller design begins with an assessment of the
approximate meridional streamlines using the equal area method to divide the
annulus. In order to fix the inlet and outflow blade angles, empirical
coefficients based on the specific speed are used. Prior to estimating the
meridional streamlines, a similar coefficient is employed to calculate the
general architecture of the impellers. The blade sections are arranged on the
produced stream surfaces after the inlet and outlet angles have been adjusted
in this way. By modifying the shape of the blade sections on the modified
stream surfaces, the composite blade's shape can be changed.
The industrial method
mentioned above is mostly based on some empirical co-relations and design
constants. When it comes to new pump design and development, the industrial
design process is a poor guidance since it frequently ignores what is actually
happening inside the pump flow tube. The aforementioned design process gives
the designer less desirable control over the course of events. Lack of a
distinct rational foundation also prevents the manufacturing of corrections for
performance gaps that fall short of expectations.
To get over the
aforementioned issues, one must develop a reasonable framework for building
impellers based on fundamental ideas, minimising the usage of empirical
correlations. A design based on fundamental principles has the benefit of
giving the designer more control over the final product while continually
keeping the physical concept in mind and allowing him to fix any issues with
the pump's functionality.
In light of the
foregoing, it is chosen to build a mixed flow pump impeller utilising the
fundamentals of fluid mechanics and turbo technology. After the impeller design
has been completed, modelling software is used to create a 3-D model of that
impeller. ANSYS analysis software is then used to estimate the stress under a
uniformly distributed and uniformly varying load. Additionally, the natural
frequency is calculated, and simulation of the same has been done to determine
the acceptability of the design. The acceptability of intake slanted position
blade is a better choice than typical trapezoidal positioned blades, according
to artificial neural network approach used to validate the results of impeller
blades.
Author (s) Details
Sambhrant
Srivastava
Department of
Mechanical Engineering, Rajkiya Engineering College, Azamgarh, India.
View Book :- https://stm.bookpi.org/MFPIRBGDMA/article/view/7757
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