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Journal articles on the topic 'Vanes diffuser'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Simon, H., T. Wallmann, and T. Mo¨nk. "Improvements in Performance Characteristics of Single-Stage and Multistage Centrifugal Compressors by Simultaneous Adjustments of Inlet Guide Vanes and Diffuser Vanes." Journal of Turbomachinery 109, no. 1 (1987): 41–47. http://dx.doi.org/10.1115/1.3262068.

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Nowadays, multistage geared centrifugal compressors are most often equipped with three-dimensional impellers and adjustable inlet guide vane cascades, at least upstream of the first stage. Optimum stage efficiencies are made possible by optimum axial in-flow into each stage and freely selectable pinion shaft speeds. Combined with intercooling of the medium, the result is high machine efficiency with good operating ranges. Additional increases in efficiency can be achieved by means of vaned diffusers. Due to the attendant restriction to the working range, this solution is not common in producti

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2

Zhao, Peng-Fei, Yan Liu, and Xiao-Fang Wang. "Analysis of vortices and performance of different diffusers in a large mass flow coefficient centrifugal compressor." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 231, no. 4 (2017): 253–73. http://dx.doi.org/10.1177/0957650917701339.

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An appropriate diffuser following an impeller is critical to realize a high efficiency and a wide operating range for a centrifugal compressor stage. The purpose of this study is to investigate the effect of different types of vaned diffusers on a large mass flow coefficient centrifugal compressor stage performance under different operating conditions and to reveal the loss mechanisms in the vaned diffusers. Five vaned diffusers are studied. Flow fields and vortices in a conventional diffuser and a rib diffuser are first examined. Then, vortices and flow fields in three different tandem diffus

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3

Jiang, P. M., and A. Whitfield. "Investigation of Vaned Diffusers as a Variable Geometry Device for Application to Turbocharger Compressors." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 206, no. 3 (1992): 209–20. http://dx.doi.org/10.1243/pime_proc_1992_206_179_02.

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The potential of guide vanes as a variable geometry device, placed in the conventional vaneless diffuser, to extend the operating range of a turbocharger compressor is investigated. Vaned diffusers are not normally employed in turbocharger applications as the consequent reduction in operating range is more damaging than the beneficial improvement in peak efficiency and pressure ratio. The variable geometry concept considered here is primarily one in which the guide vanes are introduced at the near surge flow conditions. The leading edge vane angle is set to accept the highly tangential flow at

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4

Nakagawa, Koji, Hiroshi Hayami, and Yuichi Keimi. "Comparison of Two Diffusers in a Transonic Centrifugal Compressor." International Journal of Rotating Machinery 9, no. 4 (2003): 279–84. http://dx.doi.org/10.1155/s1023621x03000253.

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Flow mechanisms suppressing the flow separation in two diffusers, a low-solidity cascade diffuser and a vaned diffuser with additional small vanes near the inlet, were compared mainly by numerical simulation. As the superiority of the low-solidity cascade diffuser was expected, a series of experiments was conducted using a transonic centrifugal compressor with a maximum pressure ratio of 7. The performance of the compressor with the vaned diffuser was comparable to that of the low-solidity cascade diffuser only between the surge point and the design flowrate at a pressure ratio of 3.5. The max

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5

Arndt, N., A. J. Acosta, C. E. Brennen, and T. K. Caughey. "Experimental Investigation of Rotor-Stator Interaction in a Centrifugal Pump With Several Vaned Diffusers." Journal of Turbomachinery 112, no. 1 (1990): 98–108. http://dx.doi.org/10.1115/1.2927428.

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This paper describes an experimental investigation of rotor-stator interaction in a centrifugal pump with several vaned diffusers. Steady and unsteady diffuser vane pressure measurements were made for a two-dimensional test impeller. Unsteady impeller blade pressure measurements were made for a second two-dimensional impeller with blade number and blade geometry identical to the two-dimensional impeller used for the diffuser vane pressure measurements. The experiments were conducted for different flow coefficients and different radial gaps between the impeller blade trailing edge and the diffu

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6

Takao, Shunya, Shinichi Konno, Shinichiro Ejiri, and Masahiro Miyabe. "Effect of diffuser vane slit on rotating stall behavior and pump performance in a centrifugal pump." Journal of Physics: Conference Series 2217, no. 1 (2022): 012054. http://dx.doi.org/10.1088/1742-6596/2217/1/012054.

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Abstract In the previous study of a centrifugal pump with a vaned diffuser, it was confirmed that the flowrate at the onset of rotating stall was shifted to the lower flowrate by slitting the diffuser vanes. As the CFD result, it was found that the jet flow from pressure-side to suction-side impinges backflow near the suction surface and it suppresses to expand toward the diffuser inlet. However, it is difficult to say that the optimized shape and slitting position have been sufficiently studied. Therefore, in this study, we investigated the effect of slitting on the pump performance and inter

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7

Yoshinaga, Y., T. Kaneki, H. Kobayashi, and M. Hoshino. "A Study of Performance Improvement for High Specific Speed Centrifugal Compressors by Using Diffusers With Half Guide Vanes." Journal of Fluids Engineering 109, no. 4 (1987): 359–66. http://dx.doi.org/10.1115/1.3242672.

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The experimental results from eighteen different centrifugal compressor stages showed that the pressure recovery of vaneless diffusers for high specific speed compressors was extremely low compared with the value expected by an ideal two-dimensional analysis. Consequently a new type of diffuser with half guide vanes on the shroud side wall was proposed. The pressure recovery of this diffuser at distorted inlet flow was considerably improved by the half guide vanes. The optimum height of the vanes was a little less than one half of the diffuser width. Measurements of the velocity distribution i

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8

Fu, Li, Ce Yang, Hang Zhang, Wenrui Bao, and Hanzhi Zhang. "Influence of vaned diffuser on the potential effect of volute and stall inception of centrifugal compressor." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 234, no. 10-11 (2020): 2546–60. http://dx.doi.org/10.1177/0954407020916562.

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In the automotive turbochargers centrifugal compressor, the volute has a strong potential effect, leading to circumferential nonuniformity of the impeller flow field and compressor stall. In this study, full-annulus unsteady simulations for centrifugal compressors with vaned/vaneless diffusers are carried out. The influence of the diffuser vane on the potential effect of the volute and stall behavior of a centrifugal compressor is studied in detail. Based on the distribution of the casing static pressure, the formation mechanism of the circumferential distribution of static pressure and the re

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9

Sinha, Manish, and Joseph Katz. "Quantitative Visualization of the Flow in a Centrifugal Pump With Diffuser Vanes—I: On Flow Structures and Turbulence." Journal of Fluids Engineering 122, no. 1 (1999): 97–107. http://dx.doi.org/10.1115/1.483231.

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Particle image velocimetry measurements are used to identify the unsteady flow structures and turbulence in a transparent centrifugal pump with a vaned diffuser. The experiments are being performed in a special facility that enables simultaneous measurements of the flow between the impeller blades, the gap between the impeller and the diffuser, between the diffuser vanes and in the volute. A custom-made 2 K×2 K digital camera with a unique digital image-shifting feature is used to record the images. For the measurements made close to design conditions, phase averaged velocity and vorticity fie

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10

Zhang, M., and H. Tsukamoto. "Unsteady Hydrodynamic Forces due to Rotor-Stator Interaction on a Diffuser Pump With Identical Number of Vanes on the Impeller and Diffuser." Journal of Fluids Engineering 127, no. 4 (2005): 743–51. http://dx.doi.org/10.1115/1.1949640.

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Experimental and computational study was developed for unsteady hydrodynamic forces on a diffuser pump impeller excited by the interaction between the impeller and the vaned diffuser with the same number of vanes as impeller. Unsteady flow calculations are made using commercially available CFD software, CFX-TASCflow, as well as the two-dimensional vortex method. Calculated pressure and fluid forces on the impeller show good agreement with measured ones. It has been demonstrated that the fluid forces on the impeller with the same number of vanes as the vaned diffuser are smaller compared with o

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11

Abdel-Hamid, A. N. "A New Technique for Stabilizing the Flow and Improving the Performance of Vaneless Radial Diffusers." Journal of Turbomachinery 109, no. 1 (1987): 36–40. http://dx.doi.org/10.1115/1.3262067.

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Experiments were conducted to investigate the effects of using small exit vanes on the characteristics of an otherwise vaneless radial diffuser of outer radius and width-to-inlet radius ratios of 1.75 and 0.116, respectively. The steady and unsteady characteristics of the diffuser were evaluated as the angle of the vanes was varied continuously at several diffuser inlet conditions. The measurements showed that the influence of the adjustable exit vanes on the diffuser flow field increased as the diffuser inlet flow angle was decreased. Elimination of the self-excited flow oscillations in the d

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12

Justen, F., K. U. Ziegler, and H. E. Gallus. "Experimental Investigation of Unsteady Flow Phenomena in a Centrifugal Compressor Vaned Diffuser of Variable Geometry." Journal of Turbomachinery 121, no. 4 (1999): 763–71. http://dx.doi.org/10.1115/1.2836730.

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The behavior of vaned radial diffusers is generally considered to be due to the flow phenomena in the vaneless and the semi-vaned space in the diffuser inlet region. Even considering unsteady aspects, the adjacent diffuser channel is regarded as less important. The flat wedge vaned diffuser of the centrifugal compressor stage investigated allows an independent continuous adjustment of the diffuser vane angle and the radial gap between impeller outlet and diffuser vane inlet, so that information about the importance of these geometric parameters can be obtained. The time-dependent pressure dist

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13

Sano, Takeshi, Yoshiki Yoshida, Yoshinobu Tsujimoto, Yuki Nakamura, and Tatsuhito Matsushima. "Numerical Study of Rotating Stall in a Pump Vaned Diffuser." Journal of Fluids Engineering 124, no. 2 (2002): 363–70. http://dx.doi.org/10.1115/1.1459076.

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This paper treats the flow instabilities in a vaned diffuser by using CFD. A commercial code with the standard κ-ε turbulence model was used for the present work. It was found that the flow instabilities in the vaned diffuser: i.e., rotating stall, alternate blade stall, and asymmetric stall, could be simulated by the present calculations. These instabilities were observed in a range with negative slope of the pressure performance curve of the diffuser. The rotating stall onset flow rate is larger for the case with larger clearance between the impeller and diffuser vanes.

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14

Rodgers, C. "Centrifugal Compressor Inlet Guide Vanes for Increased Surge Margin." Journal of Turbomachinery 113, no. 4 (1991): 696–702. http://dx.doi.org/10.1115/1.2929136.

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This paper describes the results of compressor rig testing with a moderately high specific speed, high inducer Mack number, single-stage centrifugal compressor, with a vaned diffuser, and adjustable inlet guide vanes (IGVs). The results showed that the high-speed surge margin was considerably extended by the regulation of the IGVs, even though the vaned diffuser was apparently operating stalled. Simplified one-dimensional analysis of the impeller and diffuser performances indicated that at inducer tip Mach numbers approaching and exceeding unity, the high-speed surge line was triggered by indu

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15

Arndt, N., A. J. Acosta, C. E. Brennen, and T. K. Caughey. "Rotor–Stator Interaction in a Diffuser Pump." Journal of Turbomachinery 111, no. 3 (1989): 213–21. http://dx.doi.org/10.1115/1.3262258.

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The interaction between impeller blades and diffuser vanes in a diffuser pump was investigated. Steady and unsteady pressure measurements were taken on the diffuser vanes, and the shroud wall of a vaned and a vaneless diffuser. Steady, unsteady, and ensemble-averaged unsteady data, as well as frequency spectra, are presented. The measurements were made for different flow coefficients, shaft speeds, and radial gaps between impeller blade trailing and diffuser vane leading edge (1.5 and 4.5 percent based on impeller discharge radius). The resulting lift on the vane, both steady and unsteady, was

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16

Chikere, Aja O., Hussain H. Al-Kayiem, and Zainal Ambri A. Karim. "Thermal Diffusion Performance of a Diffuser by various Guide Vanes configurations." MATEC Web of Conferences 225 (2018): 03018. http://dx.doi.org/10.1051/matecconf/201822503018.

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The use of vane-less diffuser with large diffusion angle has shown a setback in the diffusion process of high temperature working fluids. The hot gas flow was characterized as a jet-like flow. This paper presents problem, encountered practically, using a vane-less diffuser with large diffusion angle and how the problem is solved by CFD simulation. The investigated thermal diffuser has a length of 0.3 m, an inlet to outlet crosssectional area ratio of 1:25 and diffusion angle of 115.44o. To resolve the jet-like flow problem and poor distribution of the flow temperature at the diffuser outlet, t

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17

Zou, Wangzhi, Xiao He, Wenchao Zhang, Zitian Niu, and Xinqian Zheng. "Roles of vanes in diffuser on stability of centrifugal compressor." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 14 (2019): 5380–92. http://dx.doi.org/10.1177/0954410019844433.

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The stability considerations of centrifugal compressors become increasingly severe with the high pressure ratios, especially in aero-engines. Diffuser is the major subcomponent of centrifugal compressor, and its performance greatly influences the stability of compressor. This paper experimentally investigates the roles of vanes in diffuser on component instability and compression system instability. High pressure ratio centrifugal compressors with and without vanes in diffuser are tested and analyzed. Rig tests are carried out to obtain the compressor performance map. Dynamic pressure measurem

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18

Deniz, S., E. M. Greitzer, and N. A. Cumpsty. "Effects of Inlet Flow Field Conditions on the Performance of Centrifugal Compressor Diffusers: Part 2—Straight-Channel Diffuser." Journal of Turbomachinery 122, no. 1 (1998): 11–21. http://dx.doi.org/10.1115/1.555424.

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This is Part 2 of an examination of the influence of inlet flow conditions on the performance and operating range of centrifugal compressor vaned diffusers. The paper describes tests of a straight-channel type diffuser, sometimes called a wedge-vane diffuser, and compares the results with those from the discrete-passage diffusers described in Part 1. Effects of diffuser inlet Mach number, flow angle, blockage, and axial flow nonuniformity on diffuser pressure recovery and operating range are addressed. The straight-channel diffuser investigated has 30 vanes and was designed for the same aerody

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19

Majumdar, B., S. N. Singh, and D. P. Agrawal. "Flow Characteristics in a Large Area Ratio Curved Diffuser." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 210, no. 1 (1996): 65–75. http://dx.doi.org/10.1243/pime_proc_1996_210_345_02.

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Flow characteristics in a large area ratio curved diffuser (AR = 3.4, Δβ = 90°, AS = 0.685) have been experimentally evaluated with splitter vanes installed at different angles to the flow at the inlet of the diffuser. The splitter vanes deflect the flow towards the convex wall and simultaneously increase the turbulence intensity. A marked improvement in flow distribution inside the diffuser and a significant increase in the static pressure recovery coefficient are obtained with splitter vanes at a 10° angle.

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20

Atif, Abdelmadjid, Saad Benmansour, and Gerard Bois. "Numerical Investigation of Velocity Flow Field inside an Impeller Air Model of a Centrifugal Pump with Vaned Diffuser Interactions and Comparison with PIV Measurements." International Journal of Rotating Machinery 2010 (2010): 1–12. http://dx.doi.org/10.1155/2010/706043.

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The paper refers to the analysis of interactions between the impeller and the vaned diffuser on the air model of a radial flow pump. The study deals with a numerical simulation of the flow for a full 360°entire impeller and diffuser. The task is carried out close to design operating conditions and for one particular position of the impeller blade with respect to diffuser frame. Among all the results, it has been decided to mainly focus on the flow pattern at the exit part inside the impeller coming from the diffuser vanes interactions. The results are compared to the available PIV measurements

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21

Khoeini, D., and E. Shirani. "Influences of Diffuser Vanes Parameters and Impeller Micro Grooves Depth on the Vertically Suspended Centrifugal Pump Performance." Journal of Mechanics 35, no. 5 (2019): 735–46. http://dx.doi.org/10.1017/jmech.2019.13.

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ABSTRACTEffects of geometric parameters of diffuser vanes as well as impeller micro grooves depth on the performance of a vertically suspended centrifugal pump have been studied. Different diffuser vanes height,leading angles, trailing angles, wrapping angles and furthermore, impeller micro grooves depths have been analyzed thoroughly. Numerical results have been verified by comparing experimental data. Results, without considering cavitation, reveal that diffuser vanes height has the profound impact on the vertically suspended centrifugal pump performance followed by vanes wrapping angle. Add

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22

Qin, W., and H. Tsukamoto. "Theoretical Study of Pressure Fluctuations Downstream of a Diffuser Pump Impeller—Part 2: Effects of Volute, Flow Rate and Radial Gap." Journal of Fluids Engineering 119, no. 3 (1997): 653–58. http://dx.doi.org/10.1115/1.2819294.

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The fundamental analysis in the first report was extended to calculate the unsteady flow induced by the interaction between impeller blades and diffuser vanes/volute casing in a diffuser pump. The unsteady flow in the diffuser vane passage, as well as the volute casing, is assumed to be induced by the five kinds of singularities—the bound vortices distributed on the impeller blades, diffuser vanes and volute casing wall, the sources at volute outlet, and the free vortices shed from the trailing edge of diffuser vanes. Calculated unsteady pressures agree with the corresponding experimental data

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23

Ji, Chun Jun, and Qi Zhou. "Study of the Interference between the Diffuser Vanes with the Volute Tongue." Advanced Materials Research 455-456 (January 2012): 1037–41. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.1037.

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the effect of the interference between the diffuser vanes with the volute tongue was studied in this paper, based on the 3-d model of the residual heat removal pump and the numerical flow analysis platform developed with the commercial CFD software NUMECA. Results indicate that poor matching of the diffuser vanes and the volute may cause serious flow losses. The relative position between the diffuser vanes and the volute was optimized by numerical experiments. Final modifications indicate that the efficiency is increased by 6.4%.

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24

Qin, W., and H. Tsukamoto. "Theoretical Study of Pressure Fluctuations Downstream of a Diffuser Pump Impeller—Part 1: Fundamental Analysis on Rotor-Stator Interaction." Journal of Fluids Engineering 119, no. 3 (1997): 647–52. http://dx.doi.org/10.1115/1.2819293.

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A theoretical method was developed to calculate the unsteady flow caused by the interaction between impeller and diffuser vanes in a diffuser pump by using the singularity method. The unsteady flow in the diffuser vane is assumed to be induced by three kinds of unsteady vortices: bound vortices distributed on the impeller blades and diffuser vanes, and free vortices shed from the trailing edge of diffuser vanes. In order to make clear the contribution of each harmonic component of unsteady vortices to unsteady pressure, all the unsteady vortices are expressed in the form of Fourier series. The

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25

Teipel, I., and A. Wiedermann. "Three-Dimensional Flowfield Calculation of High-Loaded Centrifugal Compressor Diffusers." Journal of Turbomachinery 109, no. 1 (1987): 20–26. http://dx.doi.org/10.1115/1.3262065.

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In this paper a method for calculating inviscid three-dimensional flowfields in vaned diffusers of high-loaded centrifugal compressors will be considered. Following the classical theory of Wu different kinds of streamsurfaces have been introduced. The complete three-dimensional result is approximated by a combination of blade-to-blade streamsurfaces (S1 surface) and S2 surfaces between the side walls of the diffuser. The geometry of each of the stream sheets depends on the others. A special curvilinear coordinate system has been introduced to take into account the twisted shape of the surfaces

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26

Bai, Ling, Ling Zhou, Chen Han, Yong Zhu, and Weidong Shi. "Numerical Study of Pressure Fluctuation and Unsteady Flow in a Centrifugal Pump." Processes 7, no. 6 (2019): 354. http://dx.doi.org/10.3390/pr7060354.

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A pump is one of the most important machines in the processes and flow systems. The operation of multistage centrifugal pumps could generate pressure fluctuations and instabilities that may be detrimental to the performance and integrity of the pump. In this paper, a numerical study of the influence of pressure fluctuations and unsteady flow patterns was undertaken in the pump flow channel of three configurations with different diffuser vane numbers. It was found that the amplitude of pressure fluctuation in the diffuser was increased gradually with the increase in number of diffuser vanes. Th

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27

Saha, Sankar L., Junichi Kurokawa, Jun Matsui, and Hiroshi Imamura. "Passive Control of Rotating Stall in a Parallel-Wall Vaned Diffuser by J-Grooves." Journal of Fluids Engineering 123, no. 3 (2000): 507–15. http://dx.doi.org/10.1115/1.1374214.

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In order to control and suppress instabilities caused by swirl flow, the authors have proposed a very simple passive method utilizing shallow grooves mounted on a casing wall or diffuser wall(s) parallel to the pressure gradient. The groove is termed a “J-groove.” The method is theoretically analyzed and experimentally proved capable of suppressing rotating stall in a vaneless diffuser. The performance curve instability is characterized by the positive slope of the head-capacity curve of a mixed flow pump for the entire flow range. In continuation, this work is aimed at realizing experimentall

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28

Khoeini, D., E. Shirani, and M. Joghataei. "Improvement of Centrifugal Pump Performance by Using Different Impeller Diffuser Angles with and Without Vanes." Journal of Mechanics 35, no. 4 (2018): 577–89. http://dx.doi.org/10.1017/jmech.2018.39.

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ABSTRACTThis study aims at improving the performance of a centrifugal pump by using different angular diffusers on the downstream side of the centrifugal pump impeller. Numerical and experimental studies have been carried out on different vaned and non-vaned diffuser with three different wall divergence angle (α) of 0°, 5° and 10° to achieve that purpose. The data analyses show good agreement between the numerical and experimental results. They reveal profound effect of the divergence angle (α) of angular vaned diffuser on the head and overall efficiency of centrifugal pumps especially at high

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29

La Roche-Carrier, Nicolas, Guyh Dituba Ngoma, and Walid Ghie. "Numerical Investigation of a First Stage of a Multistage Centrifugal Pump: Impeller, Diffuser with Return Vanes, and Casing." ISRN Mechanical Engineering 2013 (June 19, 2013): 1–15. http://dx.doi.org/10.1155/2013/578072.

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This paper deals with the numerical investigation of a liquid flow in a first stage of a multistage centrifugal pump consisting of an impeller, diffuser with return vanes, and casing. The continuity and Navier-Stokes equations with the k-ε turbulence model and standard wall functions were used. To improve the design of the pump's first stage, the impacts of the impeller blade height and diffuser vane height, number of impeller blades, diffuser vanes and diffuser return vanes, and wall roughness height on the performances of the first stage of a multistage centrifugal pump were analyzed. The re

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Ubaldi, M., P. Zunino, G. Barigozzi, and A. Cattanei. "An Experimental Investigation of Stator Induced Unsteadiness on Centrifugal Impeller Outflow." Journal of Turbomachinery 118, no. 1 (1996): 41–51. http://dx.doi.org/10.1115/1.2836604.

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Detailed flow measurements were taken in a centrifugal turbomachine model to investigate the aerodynamic influence of the vaned diffuser on the impeller flow. The model consists of an unshrouded centrifugal impeller with backswept blades and a rotatable vaned diffuser, which enables a continuous variation of the vaned diffuser location with respect to the measuring points. Phase-locked ensemble-averaged velocity components have been measured with hot-wire probes at the impeller outlet for 30 different relative positions of the probe with respect to the diffuser vanes. The data also include the

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31

Yang, Chuanlei, Zhaoling Liu, Yang Liu, et al. "Influence of Diffuser Vane Thickness on Centrifugal Compressor Performance." Journal of Physics: Conference Series 2437, no. 1 (2023): 012007. http://dx.doi.org/10.1088/1742-6596/2437/1/012007.

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Abstract The structure of diffuser vanes has a significant influence on the performance of centrifugal compressors. To research the influence of diffuser vane thickness on the overall performance and internal flow condition of the centrifugal compressor. This paper takes a centrifugal compressor as the research object. By changing the diffuser vane thickness, and using three-dimensional fluid simulation technology to carry out simulation research. The results show that the thinner diffuser vanes can greatly improve the efficiency, flow rate and outlet temperature of the centrifugal compressor.

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32

Wang, Xiao Jing, Rui Chen, and Yong Zhou. "The Flow Field Analysis and Optimization of Diagonal Flow Fan Based on CFD." Advanced Materials Research 201-203 (February 2011): 2657–60. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.2657.

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In this paper, the flow field of the diagonal flow fan is simulated by FLUENT. The flow field of the axial clearance, the guide vanes and the diffuser section are analyzed and evaluated thoroughly. It is confirmed that the main factors influencing the fan performance are the guide vanes, and the diffuser section. The results are useful in guiding the optimal design to improve the flow field of diagonal flow fan.

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33

Zhu, Wei, Xiao-Dong Ren, Xue-Song Li, and Chun-Wei Gu. "Analysis and Improvement of a Two-Stage Centrifugal Compressor Used in an MW-Level Gas Turbine." Applied Sciences 8, no. 8 (2018): 1347. http://dx.doi.org/10.3390/app8081347.

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The performance of a low/high-pressure-stage centrifugal compressor in a land-use MW-level gas turbine with a pressure ratio of approximately 11 is analyzed and optimized with a 1D aerodynamic design and modeling optimization system. 1D optimization results indicate that the diameter ratio of the low-pressure-stage centrifugal compressor with a vane-less diffuser, and the divergent angle of the high-pressure-stage centrifugal compressor with a vaned diffuser, are extremely large and result in low efficiency. Through modeling design and optimization system analysis, a tandem vaned diffuser is u

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34

Pinarbasi, A., K. M. Guleren, and A. Ozturk. "Measurements of Reynolds stresses in centrifugal compressor vaned diffusers." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 8 (2008): 1487–503. http://dx.doi.org/10.1243/09544062jmes877.

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A phase lock loop sampling technique has been developed in order to perform detailed measurements for the flow field downstream of a turbomachinery rotor. Measurements have been carried out in the vaned diffuser of a low-speed centrifugal compressor using a triple hot wire anemometer. The phase lock loop technique employed in this work has provided a comprehensive representation of the complex three-dimensional unsteady flow in these diffusers. The diffuser vanes were found to have a significant influence on the flow in the vaneless space. The mixing out of the blade wakes is enhanced and acco

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35

Wang, H., and H. Tsukamoto. "Fundamental Analysis on Rotor-Stator Interaction in a Diffuser Pump by Vortex Method." Journal of Fluids Engineering 123, no. 4 (2001): 737–47. http://dx.doi.org/10.1115/1.1413242.

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A two-dimensional unsteady flow was calculated within a whole stage of a diffuser pump to investigate pressure fluctuations due to the interaction between impeller and diffuser vanes by using the vortex method, in which vortices shedding from solid boundary were determined by the basic governing equation. The Petrov-Galerkin Method was applied to yield the solutions that satisfy the boundary conditions in an integral sense, and it improved the stability and accuracy of the numerical solutions greatly. A new scheme was also proposed to improve the unsteady pressure evaluation by a boundary inte

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Meng, Xu, Zhigang Zuo, Michihiro Nishi, and Shuhong Liu. "A Numerical Study on the Flow Mechanism of Performance Improvement of a Wide-Angle Diffuser by Inserting a Short Splitter Vane." Processes 8, no. 2 (2020): 143. http://dx.doi.org/10.3390/pr8020143.

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Usage of a wide-angle diffuser may result in unfavorable separated flow and a significant diffuser loss. To improve the performance of the diffusers, inserting short splitter vanes is known as a useful method that has been demonstrated experimentally. Regarding the role of the vane in the diffuser flow, Senoo & Nishi (1977) qualitatively explained that the lift force acting on the vane should be a key factor. However, its quantitative verification remains since then. To challenge this issue, numerical simulations of incompressible flow in a wide angle of 28° two-dimensional diffuser with a

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Hunziker, R., and G. Gyarmathy. "The Operational Stability of a Centrifugal Compressor and Its Dependence on the Characteristics of the Subcomponents." Journal of Turbomachinery 116, no. 2 (1994): 250–59. http://dx.doi.org/10.1115/1.2928359.

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A centrifugal compressor was tested with three different diffusers with circular-arc vanes. The vane inlet angle was varied from 15 to 30 deg. Detailed static wall pressure measurements show that the pressure field in the diffuser inlet is very sensitive to flow rate. The stability limit regularly occurred at the flow rate giving the maximum pressure rise for the overall stage. Mild surge arises as a dynamic instability of the compression system. The analysis of the pressure rise characteristic of each individual subcomponent (impeller, diffuser inlet, diffuser channel,...) reveals their contr

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Borowski, Marek, Marek Jaszczur, Michał Karch, and Sławosz Kleszcz. "Experimental tests of the air flowing out of a swirl diffuser." EPJ Web of Conferences 269 (2022): 01006. http://dx.doi.org/10.1051/epjconf/202226901006.

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The geometry of swirl diffusers affects the shape of the air stream injected into the rooms. In this work, the air flow from the swirl diffuser was tested using the Particle Image Velocimetry (PIV) method. The presented laboratory model was a simplification of the real object and was made at a geometric scale of 1:10. The swirl diffuser was tested with two vanes settings. The measured speed fields are shown. Normalized air velocity profiles obtained at different values of volume flow were compared. This will allow better understanding of the air flow from the swirl diffusers and better shape t

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Hayami, H., Y. Senoo, and K. Utsunomiya. "Application of a Low-Solidity Cascade Diffuser to Transonic Centrifugal Compressor." Journal of Turbomachinery 112, no. 1 (1990): 25–29. http://dx.doi.org/10.1115/1.2927416.

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Low-solidity circular cascades, conformally transformed from high-stagger linear cascades of double-circular-arc vanes with solidity 0.69, were used as a part of the diffuser system of a transonic centrifugal compressor. Performance test results were compared with data of the same compressor with a vaneless diffuser. Good compressor performance and a wider flow range as well as a higher pressure ratio and a higher efficiency, superior to those with a vaneless diffuser, where the flow range was limited by choke of the impeller, were demonstrated. The test circular cascade diffusers demonstrated

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Salvage, J. W. "Development of a Centrifugal Compressor With a Variable Geometry Split-Ring Pipe Diffuser." Journal of Turbomachinery 121, no. 2 (1999): 295–304. http://dx.doi.org/10.1115/1.2841314.

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Higher noise levels resulted when a compressor was scaled to larger capacity. The machine’s sound pressure level was relieved by increasing the distance between the impeller blade tip and diffuser leading edge. However, the part-load surge line deteriorated severely as a consequence. A variable geometry pipe diffuser solved this problem, permitting operation at stringent off-design conditions. The addition of a variable diffuser permits compressor selection very near its most efficient full-load operating point, without regard for limitations normally imposed by part-load requirements. The pri

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Railly, J. W., and H. Ekerol. "Influence of a Closely Coupled Throttle on the Stalling Behavior of a Radial Compressor Stage." Journal of Engineering for Gas Turbines and Power 107, no. 2 (1985): 522–27. http://dx.doi.org/10.1115/1.3239764.

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On the basis of the classical discussion of the stability of compressor blade rows, a treatment is given of the stability of a stage consisting of a radial impeller followed by a vaned radial diffuser with a small radial gap between them. At the exit of the diffuser a radial array of adjustable vanes serves either to throttle the flow or to offer no resistance. In the latter case, throttling takes place by means of restrictions at inlet situated well upstream. The theory demonstrates that instability in the former case can only occur at the point of static instability, i.e., when the stage pre

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Fredy Surahmanto, Dipta Adityantoro, and Adi Ridwan Satria. "Laboratory-Scale Low-Speed Water Tunnel: Comparison of Experimental Flow Visualization and Computer-Aided Simulation." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 107, no. 1 (2023): 142–64. http://dx.doi.org/10.37934/arfmts.107.1.142164.

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This study aimed at developing the laboratory-scale low-speed water tunnel design by first evaluating the effect of varying the number of wide-angle diffuser vanes and then confirming flow visualization against object geometries tested by experiments and computer-aided simulation. The low-speed water tunnel design in this study consists of a wide-angle diffuser, a honeycomb, a convergent section, and a working section. To ascertain the laminar flow of water would act in the experiment, a prior simulation using 3, 6, and 12 vanes and without a vane was conducted. Some geometries, including tube

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Schoedel, Markus, Marco Menze, and Joerg R. Seume. "Experimentally Validated Extension of the Operating Range of an Electrically Driven Turbocharger for Fuel Cell Applications." Machines 9, no. 12 (2021): 331. http://dx.doi.org/10.3390/machines9120331.

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From an aerodynamic point of view, the electric turbocharger for the air supply of an automotive fuel cell faces difficult requirements: it must not only control the pressure level of the fuel cell, but it also has to operate with very high efficiency over a wide range. This paper explores features for the compressor and the turbine of an existing electric turbocharger, which are intended to meet the specific requirements of a fuel cell in an experimentally validated numerical study. Adjustable diffuser or nozzle vanes in the compressor and turbine achieve wider operating ranges but compromise

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Issac, J. M., N. Sitaram, and M. Govardhan. "Performance and wall static pressure measurements on centrifugal compressor diffusers." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 217, no. 5 (2003): 547–58. http://dx.doi.org/10.1243/095765003322407593.

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The results of experimental studies on performance and wall static pressure distribution in the diffuser passage of a low specific speed centrifugal compressor are given. The performance tests were carried out with vaneless, vane and low-solidity vane diffusers at speeds of 2500, 3000 and 3500r/min. Diffuser wall static pressures measured at 3000r/min for four flow coefficients on the shroud and hub walls are reported. The peak energy coefficient is maximum for the vane diffuser. The operating range of the low-solidity vane diffuser is wider than that of the vane diffuser. At high flow coeffic

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Zamiri, Ali, Kun Sung Park, Minsuk Choi, and Jin Taek Chung. "Transient Analysis of Flow Unsteadiness and Noise Characteristics in a Centrifugal Compressor with a Novel Vaned Diffuser." Applied Sciences 11, no. 7 (2021): 3191. http://dx.doi.org/10.3390/app11073191.

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The demands to apply transonic centrifugal compressor have increased in the advanced gas turbine engines. Various techniques are used to increase the aerodynamic performance of the centrifugal compressor. The effects of the inclined leading edges in diffuser vanes of a transonic centrifugal compressor on the flow-field unsteadiness and noise generation are investigated by solving the compressible, three-dimensional, transient Navier–Stokes equations. Diffuser vanes with various inclination angles of the leading edge from shroud-to-hub and hub-to-shroud are numerically modeled. The results show

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Huang, Qiangqiang, and Xinqian Zheng. "Potential of variable diffuser vanes for extending the operating range of compressors and for improving the torque performance of turbocharged engines." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 231, no. 4 (2016): 555–66. http://dx.doi.org/10.1177/0954407016661440.

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Turbocharging plays a significant role in internal-combustion engines. For engines in the future or for engines operating at a high altitude, compressors which are able to deliver a high pressure ratio are preferable. However, the poor low-end torque characteristics of turbocharged engines, which are often restricted by the narrow operating range of compressors at a high pressure ratio, result in a severe problem for turbocharging. The use of variable diffuser vanes is an effective method to increase the operating range, but the potential of an extended operating range at a high pressure ratio

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Dumitrescu, Oana, Mihnea Gall, and Valeriu Drăgan. "A Three-Dimensional Design to Study the Shock Waves of Linear Cascade with Reduced Mass Flow Requirements." Applied Sciences 13, no. 19 (2023): 11029. http://dx.doi.org/10.3390/app131911029.

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This paper presents the development of high-specific-speed mixed flow/centrifugal compressor vaned diffusers. Specifically, the design of a test rig that will make the visualization of shock waves on diffuser vanes manageable is addressed in the current study. In this particular case, linearization of an existing state-of-the-art compressor stage was used. For the computational modeling, a series of RANS analyses were conducted to examine the flow characteristics of the two cases explored: a complete transonic cascade and an idealized periodic passage. The distinct behavior exhibited by each v

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Chong, Wen Tong, Ahmad Fazlizan, Sook Yee Yip, Micheal K. H. Leung, and Sin Chew Poh. "Performance Evaluation of a Wind Power-Augmented Device on an Onsite Exhaust Air Energy Recovery Wind Turbine." Advanced Materials Research 935 (May 2014): 126–29. http://dx.doi.org/10.4028/www.scientific.net/amr.935.126.

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This paper presents an idea on generating green energy by extracting discharged wind energy from a cooling tower. Two vertical axis wind turbines (VAWTs) integrated with a wind power-augmentation device are installed above a cooling tower to harness unnatural wind for electricity generation. The wind power-augmentation device is built with several guide-vanes and diffuser-plates to improve the performance of the VAWTs. Guide-vanes are designed to create a venturi effect and guide the on-coming wind stream to an optimum flow angle which is matched to the optimum angle of attack of the VAWTs. Di

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Lugova, Svitlana, Pavlo Olshtynskyi, Igor Tverdokhleb, and Andryi Davidenko. "Study of Flow Pattern in Components of Intermediate Stage Vanes Diffuser of Centrifugal Pump." Applied Mechanics and Materials 630 (September 2014): 3–12. http://dx.doi.org/10.4028/www.scientific.net/amm.630.3.

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This article presents the analysis of the flow pattern in the vanes diffuser with discontinuous crossover channels. We observe design features of the crossover channels and their influence on the flow pattern

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Zhu, Honggeng, and Rentian Zhang. "Numerical Simulation of Internal Flow and Performance Prediction of Tubular Pump with Adjustable Guide Vanes." Advances in Mechanical Engineering 6 (January 1, 2014): 171504. http://dx.doi.org/10.1155/2014/171504.

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Aiming at the performance defect of tubular pump with fixed guide vanes, a design scheme of tubular pump with adjustable guide vanes is proposed, so that the inlet setting angle of guide vanes can be flexibly adjusted to coordinate with the operation conditions of pump, to ensure the inlet setting angle of guide vanes changing with the outlet flow angle of the impeller. The three-dimensional time-averaged incompressible Navier-Stokes equations are adopted to numerically simulate the internal flow field of a tubular pump with fixed and adjustable guide vanes, respectively. Computed results indi

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