Experimental and numerical flow field investigation through two types of radial flow compressor volutes

Mojaddam, Mohammad; Hajilouy-Benisi, Ali

doi:10.1016/j.expthermflusci.2016.05.016

Cited by 15 publications

(11 citation statements)

References 18 publications

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“…S.A Mousavi and M. Mojaddam optimized different models of impeller designs by using various algorithms and computational fluid dynamics methods, applied on the GT4082. The results show a significant increase in the pressure ratio, efficiency, and extension of the surge point [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 92%

Flow Simulation and Model Analysis of Efficiency and Pressure Ratio Behaviors in GT4086 Turbocharger Compressor

Omidi

2020

mech

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The present paper seeks to model and simulate the function of a centrifugal GT4082 compressor and evaluates the effects of losses in the impeller, volute, and diffuser. It is also examined the mass parameter effect on the efficiency drop at different speeds. The total and static pressure drops are also examined in the volute and diffuser. Based on the experiments, the efficiency drops in these parts modeled at different mass parameters and speeds discovered to be maximized in the volute and diffuser at a specific speed. A global minimum was observed in the overall pressure drop and a global maximum in the static pressure drop versus a mass parameter.

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Section: Introductionmentioning

confidence: 92%

Flow Simulation and Model Analysis of Efficiency and Pressure Ratio Behaviors in GT4086 Turbocharger Compressor

Omidi

2020

mech

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“…The frozen rotor assumption is used between rotating and non-rotating mediums also explained in [24]. The shear-stress transport (SST) is used for turbulence modeling in which Reynolds stress terms are treated by k − ω model near-wall region and by k − model in the far field [25]. The energy conservation equation is solved and the solution convergence is checked by the reduction of all conservative equation residuals to the order of 1 × 10 −5 .…”

Section: Modelingmentioning

confidence: 99%

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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“…To validate the numerical results, the available experimental test from a results [36,37] for a turbocharger compressor was used. The compressor impeller had six full blades and six splitters.…”

Section: Compressor Geometrymentioning

confidence: 99%

“…Around 750,000 elements per passage were used from the inlet section to vaneless diffuser discharge and near two million elements were used for the volute. A 3D flow simulation solver was used in which the Reynolds averaged Navier-Stokes equations were solved iteratively with using shear stress transform scheme for turbulence modeling [20,37]. Pressure-velocity coupling was performed by the SIMPLEC method.…”

Section: D Modelingmentioning

confidence: 99%

“…Pressure ratio versus mass flow rate was reported for 60k, 70k, 80k and 92k rpm rotational speeds, as shown in Figure 5. 1D results and 3D model results with available experimental results [36,37] are shown. The results show good agreement in which 3D model results of pressure ratio meet experimental data with negligible error and 1D results were well fitted in lower rotational speeds.…”

Section: Performancementioning

confidence: 99%

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Characterization of the Performance of a Turbocharger Centrifugal Compressor by Component Loss Contributions

2019

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The performance of an automotive turbocharger centrifugal compressor has been studied by developing a comprehensive one-dimensional (1D) code as verified through experimental results and a three-dimensional (3D) model. For 1D analysis, the fluid stream in compressor is modeled using governing gas dynamics equations and the loss mechanisms have been investigated and added to the numerical model. The objective is to develop and offer a 1D model, which considers all loss mechanisms, slip, blockage and also predicts the surge margin and choke conditions. The model captures all features from inlet duct through to volute discharge. Performance characteristics are obtained using preliminary geometry and the blade characteristics. A 3D numerical model was also created and a viscous solver used for investigating the compressor characteristics. The numerical model results show good agreement with experimental data through compressor pressure ratio and efficiency. The effect of the main compressor dimensions on compressor performance has been investigated for wide operating range and the portions of each loss mechanism in the impeller. Higher pressure ratio is achievable by increasing impeller blade height at outlet, impeller blade angle on inlet, diffuser outlet diameter and by decreasing impeller shroud diameter at inlet and blade angle at outlet. These changes may cause unfavorable consequences such as a lower surge margin or shorter operating range, which should be compromised with favorable changes. At lower rotational speeds, impeller skin friction mainly impacts the performance and at higher rotational speeds, impeller diffusion, blade loading and recirculation losses are more important. The results allow the share of each loss mechanism to be quantified for different mass flow rates and rotational speed, shedding new light on which losses are most important for which conditions. For a turbocharger, which must operate over a wide range of conditions, these results bring new insight to engineers seeking to optimize the compressor design as part of an internal combustion engine system.

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Experimental and numerical flow field investigation through two types of radial flow compressor volutes

Cited by 15 publications

References 18 publications

Flow Simulation and Model Analysis of Efficiency and Pressure Ratio Behaviors in GT4086 Turbocharger Compressor

Flow Simulation and Model Analysis of Efficiency and Pressure Ratio Behaviors in GT4086 Turbocharger Compressor

Optimization of a Centrifugal Compressor Using the Design of Experiment Technique

Characterization of the Performance of a Turbocharger Centrifugal Compressor by Component Loss Contributions

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