Investigation of Slip Models for High-Speed Centrifugal Compressors

Harrison, Herbert M.; Lou, Fangyuan; Key, Nicole L.

doi:10.2514/1.b37731

Cited by 3 publications

(4 citation statements)

References 28 publications

(70 reference statements)

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“…Traditional geometry-based approaches to modeling slip factor have been shown to exhibit large levels of error at design speed for high-speed compressors [20], and this can be seen for Wiesner's model in Figure 2a. Of the high-speed compressors, only the design point slip factor of Came's impeller is predicted within the traditionally accepted ±0.05 error band.…”

Section: Evaluation Of the Methodsmentioning

confidence: 99%

“…The SRE method provided a better approximation of Busemann's solution than Wiesner's correlation, though its accuracy in the prediction of slip factor was similar to that of Wiesner's model. Until recently, most slip models were based only on compressor geometry despite documentation that the slip factor varies with compressor operating conditions [8,11,17,19,20]. Qiu et al [9] addressed the variation of slip with flow conditions by incorporating the impeller exit flow coefficient into a relative eddy approach.…”

Section: V02et39a003-2mentioning

confidence: 99%

“…Wiesner's model is one of the most widely used models in the open literature and as such, was included as a benchmark for evaluation of the new model. Additionally, Wiesner's model has been shown to provide better estimates of slip factor for highspeed compressors than some other models in the literature [20].…”

Section: Meanline Modeling Proceduresmentioning

confidence: 99%

“…As such, the same procedure of efficiency matching was repeated for the SSCC but without the need for a diffuser loss model. Based on a sensitivity study of the slip factor to external loss presented by Harrison et al [20], 80% of the impeller loss at each operating point was allocated to internal loss mechanisms. The remaining 20% of the impeller loss was allocated to external loss sources, unless otherwise stated.…”

Section: Meanline Modeling Proceduresmentioning

confidence: 99%

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

Harrison

Key

2020

Volume 2E: Turbomachinery

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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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Section: Evaluation Of the Methodsmentioning

confidence: 99%

Section: V02et39a003-2mentioning

confidence: 99%

Section: Meanline Modeling Proceduresmentioning

confidence: 99%

Section: Meanline Modeling Proceduresmentioning

confidence: 99%

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

Harrison

Key

2020

Volume 2E: Turbomachinery

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Assessment of a novel k–ω turbulence model for transonic centrifugal impeller simulations

Liu

Wang

Zhao

et al. 2022

Trans. Can. Soc. Mech. Eng.

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Numerical simulation of high pressure ratio transonic centrifugal compressors is challenging for the existing turbulence models. A lagged k–ω model proposed by Olsen and Coakley for nonequilibrium effects was first applied to simulate the transonic centrifugal impeller SRV2-O. As comparative case studies, four other turbulence models ( k–ω model, RNG k–ε model, SST-CC model, and EARSM model) were also computed. The comparison showed that ( i) the selection of the turbulence model had a great influence on SRV2-O impeller simulations; ( ii) the lagged k–ω model had an advantage over other models in terms of overall pressure ratio and internal flow characteristics; and ( iii) the lagged model predicted a smaller blockage area caused by leakage vortex breakdown than other models, closer to the experimental result. The detailed parameter examination indicated that the nonequilibrium parameter a0 in the lagged model had little influence on the Mach number distribution and choking mass flow rate but a significant influence on the static pressure on the shroud casing. For a higher Mach number compressor, a smaller a0 is recommended for bettering the simulation accuracy.

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