Passive Control of Rotating Stall in a Parallel-Wall Vaneless Diffuser by Radial Grooves

Kurokawa, Junichi; Saha, Sankar L.; Matsui, Jun; Kitahora, Takaya

doi:10.1115/1.483230

Cited by 32 publications

(6 citation statements)

References 27 publications

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“…Most research has focused on the silt abrasion of the blade, while neglecting the impeller ring. Kurokawa et al [4] and Saha et al [5,6]proposed shallow grooves, named "J-Grooves", mounted on the casing wall of turbo-machinery in the pressure gradient 1 Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.…”

Section: Introductionmentioning

confidence: 99%

Analysis of silt abrasion of the impeller ring in a centrifugal pump with J-grooves

Qian

Wang

Guo

et al. 2016

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

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Abstract:The water flow and movement of silt in a prototype double-suction centrifugal pump was simulated using an Euler-Lagrange multiphase flow model. J-Grooves were adopted to protect the impeller ring from silt abrasion. The influence of J-grooves on the silt concentration and pump efficiency was analyzed. The results show that the radial component of the relative velocity around the impeller ring is too low to move the silt out of the spacing between the impeller plate and the casing. The high silt concentration around the impeller ring is the major contributor to silt abrasion of the impeller ring. The J-grooves induce two strong vortices, which increase the radial component of the relative velocity of water and reduce the silt concentration around the impeller ring, but additional friction losses are introduced and the pump efficiency is decreased. Optimization of the number and shape of J-grooves decreases losses in the efficiency of the pump, and effectively protects the impeller ring. Case 4 was found the most effective configuration in this study.

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Section: Introductionmentioning

confidence: 99%

Analysis of silt abrasion of the impeller ring in a centrifugal pump with J-grooves

Qian

Wang

Guo

et al. 2016

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

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“…Kurokawa et al. 29 proposed a passive method of utilizing radial shallow grooves and studied its effect theoretically and experimentally.…”

Section: Introductionmentioning

confidence: 99%

Simulation of air jets for controlling stall in a centrifugal fan

Zhang

Wang

Yuan

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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The main goal of the present work is to analyze the three-dimensional unsteady flow field of a centrifugal fan by solving Navier–Stokes equations, coupled with the throttle condition. The results show that rotating stall occurs in the original fan when the flow rate is 4.30 m3/s, and the stall inception first appears at three impeller passages near the volute tongue and front disc. An active control method is proposed to inhibit the stall inception, which involves blowing air at the inlets of the three impeller passages. This blowing control method cannot inhibit the stall inception when the blowing speed is lower than 50 m/s. The stability margin of the centrifugal fan is extended when the blowing speed is increased from 50 to 110 m/s, while no further effect is obvious with a further increase in the blowing speed. At a blowing speed of 110 m/s, rotating stall occurs again when the fan flow reaches 3.46 m3/s. After the application of the nozzle blowing, the safety margin of the centrifugal fan is extended by 13%, and an obvious stability enhancement effect is achieved. From an engineering standpoint, this new active control method for rotating stall offers a valuable means to ensure the safe operation of a centrifugal fan.

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“…Liu et al 4 studied the sealing performance and energy characteristics of a slurry pump with back-blades by computational fluid dynamics (CFD). Kurokawa et al [5][6][7][8] proposed a J-groove to improve the performance of the pump and this proved effective. The back-blade and J-groove configurations are chosen as countermeasures to silt abrasion of the impeller ring because they can increase the radial velocity of water, which helps to reduce the silt concentration around the impeller ring.…”

Section: Introductionmentioning

confidence: 99%

Influence of dynamic seals on silt abrasion of the impeller ring in a centrifugal pump

Gao

Zhang

Huai

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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The water flow and movement of silt in a prototype double suction centrifugal pump was simulated using an EulerLagrange multiphase flow model. Back-blade and J-groove configurations were adopted to protect the impeller ring from silt abrasion. Four back-blades and four J-grooves were considered. The results show that the relative velocity of water around the impeller ring is too low to move silt out of the spacing between the impeller and the casing, which results in a high silt concentration around the impeller ring. The high silt concentration around the impeller ring is the major contributor to silt abrasion of the ring. Back-blade and J-groove configurations are effective in reducing the silt concentration around the ring but extra friction loss is also introduced and the pump efficiency is decreased. Optimization of the length, position and number of back-blades, and the shape and number of J-grooves, decreases losses in pump efficiency and effectively protects the impeller ring. Case 4 for the back-blade and Case 8 for the J-groove were the most effective configurations in this study.

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Passive Control of Rotating Stall in a Parallel-Wall Vaneless Diffuser by Radial Grooves

Cited by 32 publications

References 27 publications

Analysis of silt abrasion of the impeller ring in a centrifugal pump with J-grooves

Analysis of silt abrasion of the impeller ring in a centrifugal pump with J-grooves

Simulation of air jets for controlling stall in a centrifugal fan

Influence of dynamic seals on silt abrasion of the impeller ring in a centrifugal pump

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