自泵送流体动静压型机械密封自清洁性分析

流体楔入式非接触机械密封在流体动压的形成过程中，为防止流体中固体颗粒对密封端面的损伤，需增设辅助系统以提供洁净的阻塞流体，这增加了密封初期建设和维护周期成本. 针对一种新型的泵出式自泵送流体动压型机械密封，应用Fluent中Laminar模型和DPM模型仿真研究了其在不同颗粒直径、转速、压差、液膜厚度和颗粒体积浓度下的自清洁特性. 结果表明：排屑率整体上随着颗粒体积浓度增大而减小；当颗粒体积浓度足够低时，排屑率均会达到60%以上；随着颗粒直径增大，排屑率先增大后减小，在直径0.7 μm时排屑最高达79.35%.；随着转速增大，排屑率先下降后显著上升，在计算的0~6 000 r/min范围内排屑率达到94%；排屑率受液膜厚度和压差影响较小.

During the formation of hydrodynamic pressure in fluid wedge-type non-contact mechanical seals, an auxiliary system must be added to provide clean blocking fluid to prevent solid particles in the fluid from damaging the sealing end faces, which increases the initial construction and maintenance cycle costs of the seals. Aiming at a novel pump-out self-pumping hydrodynamic mechanical seal, simulations were carried out using the Laminar model and Discrete Phase Model (DPM) in Fluent to investigate its self-cleaning performance under varying parameters including particle diameter, rotational speed, pressure difference, liquid film thickness and particle volume concentration. The results show that: the particle removal efficiency generally decreases as the particle volume concentration increases; when the particle volume concentration is sufficiently low, the particle removal efficiency can all exceed 60%; as the particle diameter increases, the particle removal efficiency first rises and then decreases, reaching a maximum of 79.35% at 0.7 μm; as the rotational speed increases, the particle removal efficiency first decreases and then rises significantly, reaching 94% within the calculated range of 0–6000 r/min; the particle removal efficiency is less affected by the liquid film thickness and pressure difference.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于自泵送流体动静压型机械密封的自清洁性分析，通过数值模拟研究了颗粒直径、转速、压差、液膜厚度和颗粒体积浓度对排屑率的影响。研究发现，在0-6000 r/min转速范围内排屑率最高可达94%，且排屑率受液膜厚度和压差影响较小，为机械密封设计提供了关键数据支持。