Design and optimization of meridional profiles for the impeller of centrifugal compressors

Mojaddam, Mohammad; Torshizi, S. Abolfazl Moussavi

doi:10.1007/s12206-017-0933-3

Cited by 16 publications

(13 citation statements)

References 5 publications

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“…The β angle is related to the azimuthal coordinate (angle θ) of blade curves through the following relation [1]. tan β = rdθ ds (8) in which r is the radial coordinate and s is the meridional coordinate. A five control point Bézier curve is fitted for each β angle distribution at hub and shroud ( Figure 4).…”

Section: Stage IImentioning

confidence: 99%

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Optimization of a Centrifugal Compressor Using the Design of Experiment Technique

Mojaddam

Pullen

2019

Applied Sciences

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Centrifugal compressor performance is affected by many parameters, optimization of which can lead to superior designs. Recognizing the most important parameters affecting performance helps to reduce the optimization process cost. Of the compressor components, the impeller plays the most important role in compressor performance, hence the design parameters affecting this component were considered. A turbocharger centrifugal compressor with vaneless diffuser was studied and the parameters investigated included meridional geometry, rotor blade angle distribution and start location of the main blades and splitters. The diffuser shape was captured as part of the meridional geometry. Applying a novel approach to the problem, full factorial analysis was used to investigate the most effective parameters. The Response Surface Method was then implemented to construct the surrogate models and to recognize the best points over a design space created as based on the Box-Behnken methodology. The results highlighted the factors that affected impeller performance the most. Using the Design of Experiment technique, the model which optimized both efficiency and pressure ratio simultaneously delivered a design with 3% and 11% improvement in each respectively in comparison to the initial impeller at the design point. Importantly, this was not at the expense of sacrificing range, of critical concern in compressor design.

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Section: Stage IImentioning

confidence: 99%

“…Many parameters are considered in this regard. For example optimization techniques were implemented to optimize the blade profile [6], meridional profiles [7,8], blade sweep angle [9], the splitter [10], the vaneless diffuser [11] and there are many others.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a Centrifugal Compressor Using the Design of Experiment Technique

Mojaddam

Pullen

2019

Applied Sciences

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“…splitter characteristics. After that, the computational fluid dynamic tools could be used to evaluate or improve the machine characteristics to obtain the acceptable performance (Mojaddam and Torshizi, 2017) to complete the design procedure.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Splitter Blade Configuration and Geometry of a Centrifugal Pump Impeller using Design of Experiment

Namazizadeh¹,

Gevari²,

Mojaddam³

et al. 2020

JAFM

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Centrifugal pumps are among the most applicable machines in a wide variety of industrial systems for fluid pumping and transportation. Therefore their optimization has always been of great importance. Pump impellers play an important role in these machines as the energy transfer takes place in this part. In the present study, the impeller of a centrifugal pump is optimized by investigating the effect of adding splitter blades and modifying their geometry. A centrifugal pump is experimentally tested and numerically simulated and the characteristic curves are obtained. In the first stage, two different sets of splitter blades with different lengths are added to the impeller and the effect of splitter blade lengths on the results are explored. The case with the highest total head and overall efficiency is selected for the optimization process. The main blade and the splitter blade leading edge position and also the splitter blade distance between two successive blades are selected for the optimization process in the second stage. Efficiency and total head of the pump are considered as the optimization objectives. Using Design of Experiment (DoE) technique, the design space is created and response surface method is utilized to find the optimum geometry. The results show adding splitters can improve total head by about 10.6% and by modifying the geometry using DoE technique it could increase further by 4.4% with the negligible effect on the pump overall efficiency.

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“…Centrifugal compressors have now found vast applications in different industries including aerospace, automotive and oil. Because of a long history and after evolutions, it is believed that design of the impeller of centrifugal compressors has now reached a mature state (Mojaddam, 2017). Although many papers and researches can be found in this subject, but it can be concluded that most of them are focused on different accessories and equipment which can enhance the performance of existing compressors by improving the efficiency, widening the working range and reaching the higher pressure ratio.…”

Section: Introductionmentioning

confidence: 99%

Improving the Performance of Centrifugal Compressors by Flow Recirculation

Torshizi

2019

JAFM

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The impeller of a centrifugal compressor is traditionally designed using some formula for only one design point which makes it less efficient in all other situations. This is especially important for compressors not experiencing a constant working condition. To improve the performance at low mass flow rates and retard the surge, an innovative concept is introduced for a centrifugal compressor. In this method pressurized air is injected at the compressor inlet to improve the flow field. With better incidence angle, related losses at off design conditions are minimized and the surge is delayed. This system is designed, modeled and adjusted for providing an optimal flow pattern at the inlet. Its implementation on a compressor has shown an increase of efficiency at low mass flow rates. It has also improved flow pattern in impeller passages and decreased the blade loading near surge condition. It is also shown that the swirl generator system can be fed up from the compressor volute or diffuser, and thus widening the compressor performance map by retarding the surge margin.

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Design and optimization of meridional profiles for the impeller of centrifugal compressors

Cited by 16 publications

References 5 publications

Optimization of a Centrifugal Compressor Using the Design of Experiment Technique

Optimization of a Centrifugal Compressor Using the Design of Experiment Technique

Optimization of the Splitter Blade Configuration and Geometry of a Centrifugal Pump Impeller using Design of Experiment

Improving the Performance of Centrifugal Compressors by Flow Recirculation

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