Investigation of Slip Models for High-Speed Centrifugal Compressors

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

doi:10.2514/6.2019-3818

Cited by 1 publication

(4 citation statements)

References 24 publications

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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 Fig. 2(a).…”

Section: Evaluation Of the Methodsmentioning

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 high-speed 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%

“…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: Introductionmentioning

confidence: 99%

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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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Section: Evaluation Of the Methodsmentioning

confidence: 99%

Section: Meanline Modeling Proceduresmentioning

confidence: 99%

Section: Meanline Modeling Proceduresmentioning

confidence: 99%