ABSTRACT

The flow of barrier fluid through an industrial pressurized dual mechanical seal cartridge is investigated and evaluated experimentally and numerically. The cartridge is of the bi-directional type wherein it is radial-flow designed and fitted with a bi-directional integral pumping ring. The standard k–ϵ turbulence model is applied and the multiple frame of reference method is utilized to simulate the motion of the pumping ring. The present study is a continuation of former experimental and numerical companion work conducted in the area of the design and evaluation of integral pumping rings for dual mechanical seals. In the present study, barrier fluid flow is visualized to provide internal insight of the flow behavior leading to a better understanding of the pumping mechanism on both quantitative and qualitative aspects. The flow field is evaluated and a number of design defects are revealed. The simulations show that barrier fluid is being trapped in closed circulation in the inboard-seal region, consequently implying weaker regeneration of barrier fluid in that region in comparison with the outboard-seal region. Moreover, the simulations also reveal the existence of a relatively large separation zone at the outlet port leading to increased losses and reduced flow rate capacity of the device.

摘要

通过工业加压双机械密封盒对阻隔流体的流动进行了实验和数值评估。滤筒为双向型，其中径向流设计并装有双向整体泵送环。标准k – ϵ应用了湍流模型，并使用了多参考框架方法来模拟泵环的运动。本研究是在双机械密封的整体泵送环的设计和评估领域进行的先前实验和数值伴侣工作的延续。在本研究中，可视化屏障流体流动以提供流动行为的内部洞察力，从而在定量和定性方面更好地理解泵送机理。对流场进行了评估，并揭示了许多设计缺陷。模拟表明，隔离液被封闭在内侧密封区域内的封闭循环中，因此，与外侧密封区域相比，这意味着该区域的隔离液再生较弱。此外，