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The scale effects on the open water performance of a pump-jet propulsor

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Abstract

In this work, the scale effects on the open water performance of a pump-jet propulsor (PJP) with pre-swirl stator are considered and implemented based on systematic numerical calculations. With considering the effects of mesh density and time-step size, the unsteady open water performance at the design advance coefficient both in full scale and model scale is first discussed. Then, the scale effects on open water performance are discussed and quantified. For further understandings, the pressure, velocity field and vortical structures are analyzed. Results indicate that different components of PJP demonstrate different scale effects on open water performance. The rotor shows more pronounced scale effects on high advance coefficients, and its thrust coefficient obtains the improvements in full scale at all operating conditions while the scale effects on its torque coefficient are affected by the advance coefficient. For the duct and stator, they exhibit decreases in thrust coefficient in full scale, and the torque coefficient of stator also decreases. Compared with the model scale, the flow on PJP shows significant differences in full scale. The pre-swirl effects of stator are enhanced, resulting in the lower fluctuation degree of rotor thrust at the design operating point. The stator wake, rotor wake, and tip clearance leakage flow show fewer effects on the outflow of duct. The flow separation on the duct outside is significantly weakened. The tip clearance leakage flow is considerably strengthened, but its development is also more significantly restrained by the higher velocity mainstream together with the shrinkage of duct in the rotor downstream.

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Data availability

The data that support the findings of this study are available within the article, and additional data can be obtained from the corresponding author upon reasonable request.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China under [Grant No. 51979226 and 51879220], and the Fundamental Research Funds for the Central Universities under [Grant No. 3102019HHZY030019 and 3102020HHZY030018].

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Authors and Affiliations

  1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Han Li, Qiaogao Huang & Guang Pan

  2. Science and Technology on Water Jet Propulsion Laboratory, Marine Design and Research Institute of China, Shanghai, 200011, People’s Republic of China

    Xinguo Dong

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  1. Han Li
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  2. Qiaogao Huang
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  3. Guang Pan
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  4. Xinguo Dong
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Correspondence to Qiaogao Huang.

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Li, H., Huang, Q., Pan, G. et al. The scale effects on the open water performance of a pump-jet propulsor. J Mar Sci Technol 27, 348–367 (2022). https://doi.org/10.1007/s00773-021-00838-6

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  • DOI: https://doi.org/10.1007/s00773-021-00838-6

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