1 edition of Performance of cavitating axial inducers with varying tip clearance and solidity found in the catalog.
Thesis (AE)--California Institute of Technology, 1957.
|Contributions||California Institute of Technology|
|The Physical Object|
|Pagination||1 v. :|
Challenges of Inducers Inordertodesigninducers with lower NPSH capability, the flow coefficient must be wcoefficient is the ratio of the incoming axial velocity/tip speed of inducer. This creates a compromise with the problem of flow instabilities andrecirculation. Brumfield Criterion for inducers (Lobanoff and Ross)File Size: 1MB. an axial inducer stage. Under such operating conditions, cavitation develops on suction side of the blades and at inducer periphery near the tip. When pressure is decreased from cavitation inception, vapour develops more and more and finally leads to the inducer performance breakdown (Fig. 1). Fig. 1. Experimental performance chart for the H2.
The hydraulic performances of a 3-bladed inducer, designed at Alta, Pisa, Italy, are investigated both experimentally and numerically. The 3D numerical model developed in ANSYS CFX to simulate the flow through the inducer and different lengths of its inlet/outlet ducts is illustrated. The influence of the inlet/outlet boundary conditions, of the turbulence models, and of the location of inlet Cited by: 2. An Internet Book on Fluid Dynamics Inducer Designs Axial ﬂow inducers are intendedto improve the cavitationperformance of centrifugal or mixedﬂow pumps Figure 1: Comparison of the suction speciﬁc speed at 3% head drop for process pumps with and without inducer (from Janigro and Ferrini ).
Application of the Full Cavitation Model to Pumps and Inducers MAHESH M. ATHAVALE*, H. Y. LI, YU JIANG, and ASHOK K. SINGHAL CFD Research Corporation, Wynn Dr., Huntsville, Alabama, , USA A new ``full cavitation model'' has been recently developed for performance predictions of engineering equipment under cavitating ¯ow conditions. inducer [in-do̳s´er] in biosynthesis, a compound that induces synthesis of a specific enzyme or sequence of enzymes, by antagonizing the corresponding repressor, or by some other mechanism. inducer (in-dūs'ĕr), A molecule, usually a substrate of a specific enzyme pathway, that combines with and deactivates an active repressor (produced by a.
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Full text of "Performance of cavitating axial inducers with varying tip clearance and other formats Siantiiy Carpenter 1 I I a f PERFORMANCE OF CAVITATING AXIAL INDUCERS WITH VARYING TIP CLEARANCE AND SOLIDITY Theois by Stanley Ilammack Carpenter Captain* United States Marine Corps In Partial Fulfillment of the Requirements For the Degree of Aeronautical.
inducer. Both of these inducers were tested in the Cavitating Pump Rotordynamic Test Facility at Alta S.p.A., Pisa, Italy. The next two inducers used for the validation are the so-called “VII” and “IX” impellers, which have been tested in the 80s at the California Institute of Technology, Pasadena, California, USA, and whose performance is.
DESIGN AND ANALYSIS OF AXIAL INDUCERS PERFORMANCES. BAKIR, S. KOUIDRI, R. NOGUERA, R. REY • Tip clearance. Effect of gas content on the cavitating and non-cavitating performance of an.
The blade tip clearance has also been shown to have a signifi- cant effect on the cavitation performance of inducers and break- down generally occurs at lower cavitation numbers for inducers with. Characterization of Cavitation Instabilities in Axial Inducers Axial inducers are typically used in order to avoid unacceptable cavitation in the centrifugal stage of the pump.
Inducers normally operate under cavitating conditions hub radius of mm, a tip blade angle of 9°, a tip solidity of. The non–cavitating and cavitating flow through an axial inducer was modeled for two flow rates, to different cavitation conditions.
The geometry of inducer studied in this work is shown in Fig. 1, and its main characteristics are listed in Table Download: Download high-res image (KB) Download: Download full-size image Fig.
by: 1. Introduction. An inducer is an axial flow impeller with blades that wrap in a central hub. An inducer serves as a small booster pump for the main impeller.
Usually inducers have between (2) and (4) vanes, although there may be more. Although the inducer usually has a lower NPSH requirement than the main impeller, it can, and often does, cavitate during normal : M.A.
El Samanody, Ashraf Ghorab, Mamdoh Aboul Fitoh Mostafa. Performance of Cavitating Axial Inducers With Varying Tip Clearance and Solidity,” Degree of Aeronautical Engineer thesis, California Institute of Technology, Pasadena, CA.
Cited by: 3. JA 17 SO Thesis Carper C Performance of cavitating axial inducers with varying tip clearance and so^ity. Thesis C BIHDEnY a5?£c Carpenter Performance of cavitating axial inducers with varying tip clearance and solidity.
An Investigation of Off-Design Operation in High Suction Performance Inducers Ryan Collins Cluff Department of Mechanical Engineering, BYU Master of Science Three-dimensional two-phase unsteady CFD simulations were run on three and four-blade inducers for the purpose of analyzing differences in cavitation stability at design and off-design Author: Ryan Collins Cluff.
This paper describes an investigation of the flows in unshrouded and shrouded inducers which are known to be highly complex, three dimensional flows with real fluid effects.
A flow visualization technique using tufts and paint dots was used to study the flows on the blade, hub and housing at off-design flows. It was found that the blade boundary layer flows were attached to the blade surface Cited by: 2. Overall performance of the tandem inducer The noncavitating performance of the tandem inducer and the performance of the front inducer are presented in Figure 6, where the head rise coefficient is shown in a function of inlet flow condition.
The data were obtained by changing the inlet flow rate from to Cavitation and Flow Instabilities in a 3- Bladed Axial Inducer Designed by Means of a Reduced value of the blade tip clearance, very few flow instabilities have been detected on the inducer, including: steady asymmetric prediction of the noncavitating performance of tapered axial inducers has been recently developed at Alta S.p.A.
in the. unshrouded inducers tested and P,=12O for the shrouded inducer. The inducer physical characteristics are presented in Table 1.
Figure 2 shows the typical geometry of these inducers. Blade angle at tip Blade tip dia. Hub/Tip ratio No. of blades Solidity Blade chord Helix lead Blade thickness Shroud thickness Shroud length Sweep back angle of. Modification on Cavitating Inducer Performance This paper explores the effect of inlet flow modifcation on the cavitating and noncavitating performance of two cavitating inducers, one of simple helical design and the other a model of the low-pressure LOX pump in the Space Shuttle Main Engine.
The rotating cavitation was only observed in three-bladed inducers. In the case of three-bladed inducers, the higher order rotating cavitation disappeared as the solidity decreased. Numerical analysis for cavitating flow in an axial pump, 12 th Symposium on Cavitation () 13– Effect of tip clearance on the performance of a Cited by: 1.
EXPERIMENTAL AND PREDICTED CAVITATION PERFORMANCE OF ' HELICAL INDUCER IN HIGH-TEMPERATURE WATER by George Kovich Lewis Research Center SUMMARY The cavitating performance of a stainless steel ' flat-plate helical inducer is evaluated in water at a rotative speed of 15 net positive suction head.
cavitating performance (i.e. head drop) at design conditions in water (Athavale and Singhal , Dupont and Okamura , Medvitz et al. , Hosangadi et al. ). The ability to model thermal effects and their impact on the mean performance of cryogenic inducers with thermal represents the current state-of.
Hub-tip ratio Number of blades Axial length, in. (cm) Peripheral extent of blades, deg Tip chord length, in. (cm) Hub chord length, in. (cm) Solidity at tip Tip blade thickness, in. (cm) Hub blade thickness, in.
(cm) Calculated radial tip clearance at hydrogen Ratio of tip clearance to blade height Material temperature, in. (cm) ( TABLEOFCONTENTS IART TITLE PAGE CKNO 1ATLEDGEMENTS ABSTRACT TABLEOFCONTENTS I.
INTRODUCTION 1 II. IOPOSEDINVESTIGATION 6 MENTALAPPARATUSANDEXPERI. Abstract. After a brief review of the fundamental aspects of cavitation relevant to the operation of high-performance inducers and turbopumps, the article summarizes their application to the analysis of pumping systems, illustrates the scaling of cavitation phenomena from model tests to full-scale operation, describes the occurrence of flow-induced instabilities in turbomachinery, and Author: Luca d’Agostino, Lucio Torre, Angelo Cervone, Giovanni Pace, Dario Valentini, Angelo Pasini.
Operation of Centrifugal Pump is very much dependent on the suction pressure. If at any given point, suction pressure decrease less than vapor pressure, cavitation will occur.
To avoid this problem, centrifugal pump suction pressure shall be large.Reliability Improvements to Centrifugal Pump Performance in Conjunction with Inducers, CFD Comparative Study Fig. 6 Pump performance curve using axial inducer.
Fig. 7 Design parameters of helical inducer. Table 3 Hydraulic measurement results using helical inducer. No Flow rate (m3/s) Head (m) Electric power (Kw) Overall eff.
(%)Author: Said, Hawash, Dalia, Gazzar, Mohamed, Samanoudy.