Centrifugal Pump Volute Design

11022016, 08:12 AM
(This post was last modified: 12012016 08:43 PM by Ángel Martin.)
Post: #1




Centrifugal Pump Volute Design
From the Author's Engineering Collection  and Available on the ETSII4 Module (ETI4 on the CL library).
This program calculates the geometric dimensions of centrifugal pump Volutes with Circular, Rectangular or Trapezoidal sections  reflecting a given configuration and performance conditions of the pump, as follows:  Nominal flow thru the impeller, QR  Impeller outer diameter, D2  impeller rotating speed in rpm  Impeller outer width, b2  impeller blade exit angle, beta2  impellers’ Pfleiderer’s coefficient, mu this can also be calculated as function of number of blades, ZR  and internal diameter, D1)  The friction losses coefficient in the volute, lambda3 (should be zero for circular volutes)  If a diffuser is installed, the outer diameter of the diffuser, D3 if it has blades, the fluid exit radial speed, V3u without blades, the friction coefficient in the diffuser, lambda2  For Circular section volutes, the volute width at the tongue, bc  For trapezoidal volutes, the volute width at the tongue, bc  and the aperture angle, delta Once these data are entered the program will prompt for the angle to calculate the outer radius of the volute. This can be repeated for many angles in a loop to further characterize the volute geometry along the interval [0, 360], i.e. from the tongue to the throat. All angles are entered in degrees, and a homogeneous unit system is to be used (SI recommended). Program Details. Data Entry requires functions PMTK and ARCLI from the AMC_OS/X Module. The PPC rootfinding “SLV” routine is used for each calculation of the results in rectangular and trapezoidal section volutes. It is included in the ETSII4 module as well. Routines “R”, “T”, “T0” are used to describe the equation to solve, depending on the diffuser type. The routine “NT” (NewType) allows for different types of volutes (Rectangular, Trapezoidal, or circular), and different design parameters known. Example. Calculate the dimensions of the three volutes types (use delta = 15 for trapezoidal) for a centrifugal pump with impeller rotating at 1450 rpm, without a diffuser and with the following configuration: Qr = 52 l/s D2 = 350 mm b2 = bc = 10 mm beta2 = 30 deg mu = 0.809 lambdac = 0.04 The solutions are given in the table below; Code: Angle (deg) Rectangular Trapezoidal Circular (center) Circular radius "To live or die by your own sword one must first learn to wield it aptly." 

11022016, 08:44 PM
Post: #2




RE: Centrifugal Pump Volute Design
(11022016 08:12 AM)Ángel Martin Wrote: This program calculates the geometric dimensions of centrifugal pump Volutes with Circular, Rectangular or Trapezoidal sections Please excuse me if this is a very dumb question, but... where is the program? (11022016 08:12 AM)Ángel Martin Wrote: The solutions are given in the table below; This will actually show up as a formatted table if you use a fixedwidth font and an external editor. It will not work with hpmuseum's message editor and "visual formatting", especially not with a mixture of tabs and spaces. Code: Angle (deg) Rectangular Trapezoidal Circular (center) Circular radius I hope this is what you wanted to show, but I'm not sure since there are some characters that cannot be displayed. Dieter 

11022016, 11:06 PM
Post: #3




RE: Centrifugal Pump Volute Design
(11022016 08:44 PM)Dieter Wrote: Please excuse me if this is a very dumb question, but... where is the program? I very nearly added the same comment, but certain that Angel would not simply forget, I reread the post and there you'll find at the top it says "Available on the ETSII4 Module (ETI4 on the CL library)." Bob Prosperi 

11032016, 06:23 AM
(This post was last modified: 11032016 06:39 AM by Ángel Martin.)
Post: #4




RE: Centrifugal Pump Volute Design
(11022016 08:44 PM)Dieter Wrote: This will actually show up as a formatted table if you use a fixedwidth font and an external editor. It will not work with hpmuseum's message editor and "visual formatting", especially not with a mixture of tabs and spaces. Thank you, that's exactly what I tried to show  this business with the fixed pitch font always trips me up/ As you see there are two omissions for rectangular volutes  the routine didn't converge to a sensible value. I tried with SOLVE instead of "SV" and the same issue showed up. The formulas appear to be ok, so I'm thinking the model may have some limitations for rectangular cases wide exit blade angles. "To live or die by your own sword one must first learn to wield it aptly." 

11032016, 06:26 AM
(This post was last modified: 11052016 07:30 PM by Ángel Martin.)
Post: #5




RE: Centrifugal Pump Volute Design
(11022016 11:06 PM)rprosperi Wrote:(11022016 08:44 PM)Dieter Wrote: Please excuse me if this is a very dumb question, but... where is the program? Yes sorry if it wasn't clear enough  thing is I didn't feel like retyping the 400+ program steps... although I should have because I found two typos in the original code. An updated ROM was sent to Monte, and it's also attached here. BTW I intend to follow up with the documentation for some of the other programs included in this collection, but it'll take a while. Not that simple to figure out some things after 30 years! "To live or die by your own sword one must first learn to wield it aptly." 

11032016, 09:49 PM
Post: #6




RE: Centrifugal Pump Volute Design
ALL
Centrifugal pumps: design & application 2e Val S. Lobanoff, Robert R. Ross Copyright© 1985, 1992 by ButterworthHeinemann Centrifugal Pumps 3e Johann Friedrich Gülich ISBN 9783642401138 ISBN 9783642401145 (eBook) DOI 10.1007/9783642401145 Springer Heidelberg Dordrecht London New York Library of Congress Control Number: 2013951850 © SpringerVerlag Berlin Heidelberg 2008, 2010, 2014 Kreiselpumpen Handbuch für Entwicklung, Anlagenplanung und Betrieb 4., aktualisierte und erweiterte Auflage ISBN 9783642400315 ISBN 9783642400322 (eBook) DOI 10.1007/9783642400322 © SpringerVerlag Berlin Heidelberg 1999, 2004, 2010, 2013 are ALL excellent reference material for this topic. BEST! SlideRule 

11042016, 05:59 AM
(This post was last modified: 11042016 08:47 AM by Ángel Martin.)
Post: #7




RE: Centrifugal Pump Volute Design
(11032016 09:49 PM)SlideRule Wrote: ... ALL excellent reference material for this topic. Sure there's got to be good reference materials nowadays, thanks for the suggestion. Back in the day we used two books, one by a French author (Marcel Sedille)  "TurboMachines, Hydrauliques et Thermiques"; and the Spanish biblereference "Turbomáquinas Hidráulicas", by Claudio Mataix. The funny thing was the French book was already out of print even then, but the teacher insisted it was "the one"  probably because he used it to study the subject himself. Needless to say that not having the text widely available didn't make it easier on the students, which I always suspected was part of the same plot ;) "To live or die by your own sword one must first learn to wield it aptly." 

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