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<p>The suction-side oil temperature (ST) significantly influences the unsteady internal flow characteristics and performance stability of cycloidal rotor pumps (CRP). To clarify these effects, a three-dimensional transient numerical model incorporating dynamic mesh techniques is established to simulate the internal flow evolution under varying ST conditions. The results indicate that the reduced oil viscosity leads to a decline in average flow rate and a notable increase in the outlet flow pulsation factor (KQ) as the ST increases. Moreover, the expansion of low-pressure regions and a further decrease in the minimum pressure indicate a more pronounced negative pressure condition. The rotor’s radial excitation force weakens and becomes more spatially concentrated, while leakage through the intermeshing clearance increases with temperature. Frequency-domain analysis confirms that the dominant pressure pulsation frequency aligns closely with the rotor meshing frequency (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({f}_{n}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>f</mi> <mi>n</mi> </msub> </math></EquationSource> </InlineEquation>), and the amplitude in the frequency domain slightly increases with temperature. At elevated ST, the internal flow structure becomes more complex and disordered, with intensified turbulence and greater vortex activity observed in inter-rotor regions. These findings reveal the intrinsic characteristics of thermal–flow coupling within the CRP and provide theoretical guidance for structural optimization, leakage mitigation, and improved operational stability under high-temperature conditions.</p>

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Effect of suction oil temperature on internal flow characteristics of a cycloid rotor pump

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Feicen Yu,
  • Yiwu Wu,
  • Caiping Wang,
  • Chuanwu Li,
  • Yuyang Dai,
  • Zhenmu Chen

摘要

The suction-side oil temperature (ST) significantly influences the unsteady internal flow characteristics and performance stability of cycloidal rotor pumps (CRP). To clarify these effects, a three-dimensional transient numerical model incorporating dynamic mesh techniques is established to simulate the internal flow evolution under varying ST conditions. The results indicate that the reduced oil viscosity leads to a decline in average flow rate and a notable increase in the outlet flow pulsation factor (KQ) as the ST increases. Moreover, the expansion of low-pressure regions and a further decrease in the minimum pressure indicate a more pronounced negative pressure condition. The rotor’s radial excitation force weakens and becomes more spatially concentrated, while leakage through the intermeshing clearance increases with temperature. Frequency-domain analysis confirms that the dominant pressure pulsation frequency aligns closely with the rotor meshing frequency ( \({f}_{n}\) f n ), and the amplitude in the frequency domain slightly increases with temperature. At elevated ST, the internal flow structure becomes more complex and disordered, with intensified turbulence and greater vortex activity observed in inter-rotor regions. These findings reveal the intrinsic characteristics of thermal–flow coupling within the CRP and provide theoretical guidance for structural optimization, leakage mitigation, and improved operational stability under high-temperature conditions.