Computational Study of the CC3 Impeller and Vaneless Diffuser Experiment

Kulkarni, Sameer; Beach, Timothy A.; Skoch, Gary J.

doi:10.2514/6.2013-3631

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…The primary performance and geometric parameters of each stage are given in Table 1, and detailed documentation for the stages can be found in Refs. [8,23,[34][35][36][37][38][39][40][41].…”

Section: Methodology For Evaluation Of Slip Modelsmentioning

confidence: 99%

Investigation of Slip Models for High-Speed Centrifugal Compressors

Harrison

Lou

Key

2021

Journal of Propulsion and Power

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Section: Methodology For Evaluation Of Slip Modelsmentioning

confidence: 99%

Investigation of Slip Models for High-Speed Centrifugal Compressors

Harrison

Lou

Key

2021

Journal of Propulsion and Power

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“…Because the CFD was calculated for adiabatic conditions, the CFD efficiency value was slightly higher than the experimental value. the CFD results of the impeller of the base compressor were compared with the experimental data to validate the analytical method of this study [22]. The performance curves are shown in Figure 5a,b.…”

Section: Computational Grid and Validationmentioning

confidence: 97%

“…To predict the performance of the impeller, the 3D Steady Reynolds-Averaged Navier-Stokes equations were solved using ANSYS CFX software (19.3, ANSYS, Canonsburg, PA, USA). The SST turbulence model was used as the turbulence model, and the CFD results of the impeller of the base compressor were compared with the experimental data to validate the analytical method of this study [22]. The performance curves are shown in Figure 5a,b.…”

Section: Computational Grid and Validationmentioning

confidence: 99%

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Influences of the Flow Cut and Axial Lift of the Impeller on the Aerodynamic Performance of a Transonic Centrifugal Compressor

et al. 2019

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In this study, the influences of the flow cut and axial lift of the impeller on the aerodynamic performance of a transonic centrifugal compressor were analyzed. The flow cut is a method to reduce the flow rate by decreasing the impeller passage height. The axial lift is a method of increasing the impeller passage height in the axial direction, which increases the impeller exit width (B2) and increases the total pressure. A NASA CC3 transonic centrifugal compressor with a backswept angle was used as a base compressor. After applying the flow cut, the total pressure at the target flow rate was lower than the total pressure at the design point due to the increase in the relative velocity at the impeller exit. After applying the axial lift, the total pressure at the design flow rate was increased, which was caused by the reduction in the relative velocity as the passage area at the impeller exit was increased. By applying the flow cut and axial lift methods, it was shown that the variation in relative velocity at the impeller exit has a significant effect on the variation in total pressure. In addition, it was found that the relative velocity at the impeller exit of the target flow rate is maintained similar to the base impeller when the flow cut and the axial lift are combined. Therefore, by combining the flow cut and the axial lift, three transonic centrifugal impellers with flow fractions of 0.7, 0.8, and 0.9 compared to the design flow rate were newly designed.

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“…Detailed documentation for each of the stages can be found in Refs. [25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Meanline Modeling Proceduresmentioning

confidence: 99%

A New Approach to Modeling Slip and Work Input for Centrifugal Compressors

Harrison

Key

2021

Journal of Engineering for Gas Turbines and Power

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A new method of modeling slip factor and work input for centrifugal compressor impellers is presented. Rather than using geometry to predict the behavior of the flow at the impeller exit, the new method leverages governing relationships to predict the work input delivered by the impeller with dimensionless design parameters. The approach incorporates both impeller geometry and flow conditions and, therefore, is inherently able to predict the slip factor both at design and off-design conditions. Five impeller cases are used to demonstrate the efficacy of the method, four of which are well documented in the open literature. Multiple implementations of the model are introduced to enable users to customize the model to specific applications. Significant improvement in the accuracy of the prediction of slip factor and work input is obtained at both design and off-design conditions relative to Wiesner's slip model. While Wiesner's model predicts the slip factor of 52% of the data within ±0.05 absolute error, the most accurate implementation of the new model predicts 99% of the data within the same error band. The effects of external losses on the model are considered, and the new model is fairly insensitive to the effects of external losses. Finally, detailed procedures to incorporate the new model into a meanline analysis tool are provided in the appendices.

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Computational Study of the CC3 Impeller and Vaneless Diffuser Experiment

Cited by 9 publications

References 12 publications

Investigation of Slip Models for High-Speed Centrifugal Compressors

Investigation of Slip Models for High-Speed Centrifugal Compressors

Influences of the Flow Cut and Axial Lift of the Impeller on the Aerodynamic Performance of a Transonic Centrifugal Compressor

A New Approach to Modeling Slip and Work Input for Centrifugal Compressors

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