Analysis of Two-Phase Flow in Cryogenic Damper Seals—Part II: Model Validation and Predictions
Analysis of Two-Phase Flow in Cryogenic Damper Seals—Part II: Model Validation and Predictions
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DOI：
10.1115/1.2834414
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发表时间：
1998-04
影响因子：
2.5
通讯作者：
G. Arauz;L. Andrés
中科院分区：
文献类型：
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作者：
G. Arauz;L. Andrés
低温流体阻尼器密封在接近液体-蒸汽区域（接近临界点或稍微过冷）操作时可能会形成两相流区域，这会影响密封性能和可靠性。全液体、液体-蒸气和全蒸气，即，在第一部分中给出了用于预测密封动态强制响应的连续汽化整体流动模型。本文详细介绍了流动方程的数值解法。静态密封特性、泄漏和轴向压降的计算预测与现有的气态氮密封和密封出口平面处具有两相的液态氮密封的测量结果具有良好的相关性。讨论了两相流状态对氧气阻尼器密封的动态力系数和稳定性的影响。流体的压缩性效应，特别是对于具有低质量蒸汽含量的混合物，是极其重要的。在这些条件下，密封直接刚度的增加和涡动频率比的降低。
Cryogenic fluid damper seals operating close to the liquid-vapor region (near the critical point or slightly sub-cooled) are likely to develop a two-phase flow region which affects the seal performance and reliability. An all-liquid, liquid-vapor, and all-vapor, i.e., a continuous vaporization bulk flow model for prediction of the seal dynamic forced response is given in Part I. The numerical method of solution of the flow equations is detailed here. Computed predictions for static seal characteristics, leakage and axial pressure drop, correlate well with existing measurements for a gaseous nitrogen seal and a liquid nitrogen seal with two-phase at the seal exit plane. The effects of two-phase flow regimes on the dynamic force coefficients and stability of an oxygen damper seal are discussed. Fluid compressibility effects, particularly for mixtures with low mass content of vapor, are of utmost importance. Under these conditions, an increase on seal direct stiffness and reduction of whirl frequency ratio are shown to occur.