A Study on Centrifugal Impeller and Diffuser Flow

Krain, H.

doi:10.1115/1.3230791

Cited by 107 publications

(62 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The first reported measurements were obtained by Eckardt (1976) using a Laser-2-Focus Velocimeter. Since then, several other researchers ( Adler and Levy, 1979;Eckardt, 1979;Krain, 1981Krain, , 1987Ahmed and Elder, 1990;Pak et al, 1993;Krain et al, 1995) have used laser anemometers to measure the flow fields within high-speed centrifugal impellers configured with both vaned and vaneless diffusers. Hathaway et al (1993) reported results from a study in a large low-speed compressor.…”

Section: Introductionmentioning

confidence: 99%

Laser Anemometer Measurements of the Flow Field in a 4:1 Pressure Ratio Centrifugal Impeller

Skoch

Prahst²,

Wernet

et al. 1997

Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery

View full text Add to dashboard Cite

A laser-doppler anemometer was used to obtain flow-field velocity measurements in a 4:1 pressure ratio, 4.54 kg/s (10 lbm/s), centrifugal impeller, with splitter blades and backsweep, which was configured with a vaneless diffuser. Measured through-flow velocities are reported for ten quasi-orthogonal survey planes at locations ranging from 1% to 99% of main blade chord. Measured through-flow velocities are compared to those predicted by a 3-D viscous steady flow analysis (Dawes) code.The measurements show the development and progression through the impeller and vaneless diffuser of a through-flow velocity deficit which results from the tip clearance flow and accumulation of low momentum fluid centrifuged from the blade and hub surfaces. Flow traces from the CFD analysis show the origin of this deficit which begins to grow in the inlet region of the impeller where it is first detected near the suction surface side of the passage. It then moves toward the pressure side of the channel, due to the movement of tip clearance flow across the impeller passage, where it is cut by the splitter blade leading edge. As blade loading increases toward the rear of the channel the deficit region is driven back toward the suction surface by the cross-passage pressure gradient. There is no evidence of a large wake region that might result from flow separation and the impeller efficiency is relatively high. The flow field in this impeller is quite similar to that documented previously by NASA Lewis in a large low-speed backswept impeller.

show abstract

Section: Introductionmentioning

confidence: 99%

Laser Anemometer Measurements of the Flow Field in a 4:1 Pressure Ratio Centrifugal Impeller

Skoch

Prahst²,

Wernet

et al. 1997

Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery

View full text Add to dashboard Cite

show abstract

“…For example, there is no definitive resolution of whether the existence and location of large regions of throughflow velocity deficit adversely impact loss generation within the impeller. Detailed measurements of the internal flow made by Krain [5], Hathaway et al [6], and more recently Skoch et al [7] are helping to fill some gaps. Moreover, application of CFD moored to these benchmark data sets can greatly increase the information content and also enhance our ability to make design choices.…”

Section: Introduction Introductionmentioning

confidence: 99%

Aerodynamic synthesis of a centrifugal impeller using CFD and measurements

Larosiliere

Skoch

Prahst³

1997

33rd Joint Propulsion Conference and Exhibit

View full text Add to dashboard Cite

The performance and flow structure in an unshrouded impeller of approximately 4:1 pressure ratio is synthesized on the basis of a detailed analysis of 3D viscous CFD results and aerodynamic measurements. A good data match was obtained between CFD and measurements using laser anemometry and pneumatic probes. This solidified the role of the CFD model as a reliable representation of the impeller internal flow structure and integrated performance. Results are presented showing the loss production and secondary flow structure in the impeller. The results indicate that while the overall impeller efficiency is high, the impeller shroud static pressure recovery potential is underdeveloped leading to a performance degradation in the downstream diffusing element. Thus, a case is made for a followon impeller parametric design study to improve the flow quality. A strategy for aerodynamic performance enhancement is outlined and an estimate of the gain in overall impeller efficiency that might be realized through improvements to the relative diffusion process is provided.

show abstract

“…Currently, grids used in the numerical calculation can be divided into two categories, including structured and unstructured grids. In view of the complex geometry of the outdoor air conditioner, unstructured grids is selected as adaptability grid type to the geometry structure which can adapt with the irregularly changing fan blade shape fitly [2] . So the model can be divided into air inlet domain, the impeller domain and export domain.…”

Section: Geometric Model and Mesh Generationmentioning

confidence: 99%

Numerical simulation of the whole flow field of an axial-flow fan used in an air conditioner

Chen¹,

Li²,

Hu³

et al. 2013

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract：Numerical simulation of a three-dimensional turbulent flow in the whole flow field of an axial-flow fan is performed. Unstructured grids are used to discrete the computational domain. Pressure boundary conditions are specified to the inlet and the outlet. The SIMPLE algorithm, in conjunction with the RNG k-ε turbulent model, is used to solve the threedimensional Navier-Stokes equations. The moving reference frame is adopted to transfer data between the interfaces of the rotating field and the stationary field. Based on the calculation of the inner-flow in the fan, the velocity field and pressure field were farther analyzed. The simulation results are of important significance to the optimal design and noise control of the fan.

show abstract

A Study on Centrifugal Impeller and Diffuser Flow

Cited by 107 publications

References 0 publications

Laser Anemometer Measurements of the Flow Field in a 4:1 Pressure Ratio Centrifugal Impeller

Laser Anemometer Measurements of the Flow Field in a 4:1 Pressure Ratio Centrifugal Impeller

Aerodynamic synthesis of a centrifugal impeller using CFD and measurements

Numerical simulation of the whole flow field of an axial-flow fan used in an air conditioner

Contact Info

Product

Resources

About