宋科, 杨邦成. 基于熵产理论的导管桨流动损失特性[J]. 中国舰船研究, 2022, 17(2): 91–97. doi: 10.19693/j.issn.1673-3185.02299
引用本文: 宋科, 杨邦成. 基于熵产理论的导管桨流动损失特性[J]. 中国舰船研究, 2022, 17(2): 91–97. doi: 10.19693/j.issn.1673-3185.02299
SONG K, YANG B C. Flow energy loss characteristics of ducted propeller using entropy production theory[J]. Chinese Journal of Ship Research, 2022, 17(2): 91–97. doi: 10.19693/j.issn.1673-3185.02299
Citation: SONG K, YANG B C. Flow energy loss characteristics of ducted propeller using entropy production theory[J]. Chinese Journal of Ship Research, 2022, 17(2): 91–97. doi: 10.19693/j.issn.1673-3185.02299

基于熵产理论的导管桨流动损失特性

Flow energy loss characteristics of ducted propeller using entropy production theory

  • 摘要:
      目的  为了准确定位导管桨在运行时流动损失发生的位置与损失大小,从能量角度对导管桨的流动损失特性进行分析。
      方法  通过求解雷诺时均N-S方程并结合熵产理论,对导管桨在不同转速与进速条件下进行三维定常模拟研究,据此对导管桨进行加装毂帽鳍的优化改进。
      结果  结果表明:在相同转速下,黏性耗散熵产值随进速的增大而增大,而湍流耗散熵产值随进速的增大而减小;在相同进速下,黏性耗散熵产值和湍流耗散熵产值均随转速的增大而显著上升;不同工况条件下的湍流耗散熵产的占比均大于黏性耗散熵产,导管桨的不可逆流动损失的主要原因在于湍流耗散;导管桨的流动损失区域主要位于导管后缘附近区域和桨毂后方,其中桨毂后方所形成的大范围的毂涡区正是流动损失的高位集中区。此外,改进后的导管桨能够显著改善桨尾部的涡流分布,降低由毂涡所引起的流动损失。
      结论  研究揭示了导管桨运行时流动损失的特点,并准确定位了流动损失集中区,结果可为导管桨节能优化设计及流动损失识别分析提供新的思路。

     

    Abstract:
      Objective  In order to accurately locate the zone and size of flow energy loss during the operation of a ducted propeller, the flow energy loss characteristics are analyzed from the perspective of energy.
      Method  Steady ducted propeller simulations are investigated under different advance coefficients and rotational speed conditions by solving the Reynolds-Averaged Navier–Stokes equations and entropy production equation, and the optimization of a ducted propeller with boss cap fins is carried out on this basis.
      Results  The value of viscous dissipation entropy production increases with the increase of the advance coefficient, while the value of turbulent dissipation entropy production decreases with the increase of the advance coefficient at the same rotational speed. At the same advance coefficient, the two kinds of entropy production value increase significantly with the increase of rotational speed. The proportion of turbulent dissipation entropy production is larger than that of viscous dissipation entropy production in different operating modes, so the turbulent dissipation is the main reason for the irreversible flow energy loss. The main flow loss zone is behind the trailing edge of the duct and hub, in which the hub vortex zone formed behind the hub is exactly the high concentration zone of the flow energy loss. In addition, the improved ducted propeller with boss cap fins can significantly improve the vortex distribution at the tail of the propeller and reduce the flow energy loss caused by the hub vortex.
      Conclusions  This study reveals the flow loss mechanism of ducted propellers and accurately locates the flow energy loss concentration zone, offering new insights into the energy-saving optimization design and flow energy loss identification analysis of ducted propellers.

     

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