An optimum design procedure for an aerodynamic radial diffuser with incompressible flow at different Reynolds numbers

Rossetti, Antonio; Ardizzon, Guido; Pavesi, Giorgio; Cavazzini, Giovanna

doi:10.1243/09576509jpe797

Cited by 13 publications

(11 citation statements)

References 20 publications

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“…The results related to the cambered plate blade can also be utilized in the design of blades of centrifugal fans with cambered plate blades, as long as the fan can be modelled with blade cascade data with low solidity. 19 Similarly, the findings can be incorporated into the design of cambered-plate guide vane blades, e.g. subsequently mounted ''bolt-on'' outlet guide vanes, with low solidity.…”

Section: Experimental Techniquementioning

confidence: 99%

Lift and drag force measurements on basic models of low-speed axial fan blade sections

Balla

Vad

2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents comparative data on the aerodynamic lift and drag of basic model representations of low-speed axial fan blade sections. Three main types of blades are investigated: flat plate, cambered plate and RAF6-E profiled airfoil. Lift and drag force are measured at three different Reynolds numbers (0.6•10 5 , 10 5 and 1.4•10 5) around the threshold value of 10 5. The measurement data is compared to literature data. The aerodynamic force measurements reveal that, for Reynolds numbers below 10 5 , cambered plate blade sections can be superior to airfoil profiles in terms of aerodynamic efficiency, especially in the high-load range. The effect of leading edge bluntness is also investigated. Leaving the leading edge of cambered plates blunt, tends to be uncritical for low Reynolds numbers at angles of attack between 4°and 10° but is critical at angles between 0° and 4°. KEYWORDS airfoil, cambered plate blade, low-Reynolds-number axial fan, low-speed fan NOMENCLATURE A area [mm 2 ] c chord [mm] CL lift coefficient CD drag coefficient d maximum height of the camber line [mm]

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Section: Experimental Techniquementioning

confidence: 99%

Lift and drag force measurements on basic models of low-speed axial fan blade sections

Balla

Vad

2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…A design procedure for radial cascade diffusers for incompressible flow, based on the maximum ratio between the flow deflection and the total pressure loss coefficient, was proposed by Pavesi et al 4 The useful design charts of a diffuser were provided and validated by the test cases, and the results had a satisfactory agreement. Rossetti et al 5 presented a multi-objective optimum design procedure aimed at achieving the best compromise between flow deflection, static pressure recovery, and total pressure loss for aerodynamic diffusers. Jang et al 6 optimized the stacking line of the stator blade in a single-stage transonic axial compressor by using a response surface method (RSM) and numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the diffuser in a centrifugal pump by combining response surface method with multi-island genetic algorithm

Wang

Yuan

Pei

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part E:

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The diffuser plays a significant role in the performance of a centrifugal pump, especially for a high-power centrifugal pump. Therefore, to improve the efficiency of a centrifugal pump, optimization of a vaned diffuser is proposed in this work. The steady simulations were carried out by solving the three-dimensional Reynolds-averaged Navier-Stokes equations with a shear stress transport turbulence model. The numerical head and efficiency were validated by the experimental results of the original pump, and the results show that the predicted performance of the numerical simulation is in good agreement with the experimental results. Four design variables of the diffuser including the diffuser inlet diameter D 3 , diffuser inlet width b 3 , diffuser inlet angle 3 , and diffuser wrap angle ' 2 were selected to design by the CFturbo 9.0. The diffusers under test were selected using the orthogonal experiment method using the orthogonal array L 16 (4 4). The effect of the four variables on the pump's efficiency was investigated by the predicted efficiency of 16 diffusers. A quadratic polynomial fitting function for the variables and efficiency was constructed using the response surface method. The optimal values were obtained by solving the response function with the multi-island genetic algorithm. Through the analysis of the range and quadratic regression, it was found that the diffuser wrap angle has the most significant influence on efficiency. The efficiency of the optimal pump increased by 8.65% compared with the original scheme. The velocity distributions in the diffuser inlet and volute were improved and became more uniform. The total pressure in the diffuser and volute of the optimal pump was higher than that of the original pump.

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“…Classic empirical 2D cascade correlations are used even very recently in preliminary blade design, e.g. Templalexis et al [ 18 ] and Rossetti et al [ 19 ]. Correlations by Howell are of frequent use, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Correlations by Howell are of frequent use, e.g. references [ 8 ], [ 15 ], [ 19 ] to [ 21 ]. As a representative choice, empirical correlations by Howell are used in this article.…”

Section: Introductionmentioning

confidence: 99%

“…Correlations by Howell et al [ 17 ], cited in Carter [ 8 ], provide a convenient tool for this purpose. Howell’s data are used to this day for obtainment of favourable solidity [ 19 ]. It is noted, however, that the favourable solidity can be estimated using other databases as well, as demonstrated in Vad [ 2 ] and Carter [ 8 ]. At a given mean radius of a rotor of CVD, the favourable solidity has been found to be lower in the Q3D approach than that in the Q2D approach.…”

Section: Introductionmentioning

confidence: 99%

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Incorporation of forward blade sweep in preliminary controlled vortex design of axial flow rotors

Vad

2012

Proceedings of the Institution of Mechanical Engineers, Part A:

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A new controlled vortex design (CVD) method has been presented herein, incorporating forward blade sweep (FSW) in the preliminary design phase of axial flow rotors. Supplementing the traditional quasi-two-dimensional (Q2D) technique applied to CVD rotors of notable radial flow, the new method enables a more accurate consideration and control of blade aerodynamics along the three-dimensional suction side flow paths, where the majority of loss is generated away from the endwalls. For this purpose, the new method unifies Q2D and quasi-three-dimensional (Q3D) blade design approaches for CVD rotors. The incorporated Q2D and Q3D approaches can rely on traditional cascade correlations. The Q3D approach is to be aided by computational fluid dynamics. In contrast to the view dominating in literature that sweep is prescribed arbitrarily in preliminary design, the new method serves with the FSW angle distribution as design output. This means that the favourable blade stacking geometry is a result of the proposed preliminary design process. A design case study has been presented for demonstrating the consistency and advantages of the proposed method. At the design flow rate, fair agreement was found between the simulated and modelled three-dimensional flow features for the FSW rotor. Furthermore, moderation of total pressure loss was observed on the suction side away from the endwalls, leading to efficiency gain.

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An optimum design procedure for an aerodynamic radial diffuser with incompressible flow at different Reynolds numbers

Cited by 13 publications

References 20 publications

Lift and drag force measurements on basic models of low-speed axial fan blade sections

Lift and drag force measurements on basic models of low-speed axial fan blade sections

Optimization of the diffuser in a centrifugal pump by combining response surface method with multi-island genetic algorithm

Incorporation of forward blade sweep in preliminary controlled vortex design of axial flow rotors

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