Multi-point optimal design for diffuser cascades of centrifugal compressors

Fan, Haibo; Xi, Guang; Wang, S.-J.

doi:10.1243/0957650001538281

Cited by 6 publications

(7 citation statements)

References 9 publications

(15 reference statements)

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“…The centrifugal compressor encompasses an unshroud impeller and a vaned diffuser and uses an external volute to transfer the discharge flow from the impeller and diffuser to the pipe system and to increase the pressure of the flow further. In the design of the small-size centrifugal impeller, the approximation model proposed by Wang 20 is adopted, while the 'multipoint design' approach for single airfoils proposed by Fan 21 is adopted in the design of the vaned diffuser profile. The volute was designed for circumferentially constant angular momentum distribution.…”

Section: Descriptions Of the Investigated Compressor And Numerical Methodsmentioning

confidence: 99%

Exploration of a new-type grooved casing treatment configuration for a high-speed small-size centrifugal compressor

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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The main design target for a casing treatment device is to increase the stall margin of a given compressor without sacrificing efficiency. In this article, numerical and experimental investigations about a new-type grooved casing treatment configuration are presented for a high-speed small-size centrifugal compressor. Different from traditional grooved casing treatments, in which the grooves are always placed over the rotor (for both axial and radial compressors), one or several circumferential casing grooves are placed along the shroud side of the diffuser passage in this configuration, to enhance the stall margin of the compressor. Computational fluid dynamics analysis is performed under stage environment in order to find the optimum location of the circumferential casing groove for the subsequent experiments in consideration of stall margin enhancement and peak efficiency gain, and the impact of groove number to the effect of this new-type grooved casing treatment configuration in enhancing the stall margin of the compressor stage is studied. It is found that stall margin gain due to the existence of circumferential casing grooves arises from the suction-reinjection effect of the low momentum fluid and its transportation along the circumferential and streamwise directions in the grooves and the grooves located at the middle and rear part of the diffuser casing wall have more pronounced effect in expanding the stall margin of the centrifugal compressor. In order to verify the effectiveness of this new-type grooved casing treatment configuration, the solid casing compressor and the compressors with circumferential casing grooves are tested in our test rig. The results indicate that this new-type grooved casing treatment configuration can obtain obvious improvement in the stall margin without sacrificing peak efficiency. Also, the numerical investigation is conducted for the entire compressor with circumferential casing grooves and the result is compared with the experimental data.

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Section: Descriptions Of the Investigated Compressor And Numerical Methodsmentioning

confidence: 99%

Exploration of a new-type grooved casing treatment configuration for a high-speed small-size centrifugal compressor

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…the difference between the database maximum and minimum values. Distances between the best positionŷ and the x i was expressed then by (15) where j denotes the jth dimension. Euclidean norm was used to compute the vector length.…”

Section: Particle Swarm Optimizermentioning

confidence: 99%

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

Rossetti

Ardizzon

Pavesi

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this article a systematic procedure aimed at achieving the best compromise between flow deflection, static pressure recovery, and total pressure loss is proposed for aerodynamic diffusers with incompressible flow. Such a result was accomplished by using a neural network to generalize the radial diffusers performance data obtained by numerical analyses, a multi-objective approach based on the employment of fuzzy sets, and a swarm particle algorithm to find a good compromise between flow deflection, static pressure recovery, and total pressure loss. Useful design tools, obtained by collecting the results in proper design charts, are finally proposed to simplify the design of radial diffusers without resorting to expensive and time-consuming procedures of optimization. The influence of the Reynolds number oil the overall performance was also taken into account

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“…The optimized cascade airfoil was demonstrated to have improved aerodynamic performance. Fan et al 8 used a multi-point design method for diffuser cascades of centrifugal compressors by solving the flow loss coefficients with a GA. A GA incorporating a neural network technique was proposed to optimize a diffuser blade profile for turbomachinery by Fan. 9 Kong et al 10 proposed a new method to determine the parameters of the guide vane of radial diffusers through mathematic relations.…”

Section: Introductionmentioning

confidence: 99%

“…Fan et al. 8 used a multi-point design method for diffuser cascades of centrifugal compressors by solving the flow loss coefficients with a GA. A GA incorporating a neural network technique was proposed to optimize a diffuser blade profile for turbomachinery by Fan. 9 Kong et al.…”

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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Multi-point optimal design for diffuser cascades of centrifugal compressors

Cited by 6 publications

References 9 publications

Exploration of a new-type grooved casing treatment configuration for a high-speed small-size centrifugal compressor

Exploration of a new-type grooved casing treatment configuration for a high-speed small-size centrifugal compressor

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

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

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