The influence of a central groove on static and dynamic characteristics of an annular liquid seal with laminar flow
MetadataShow full item record
This thesis provides experimental static and dynamic results for four pairs of seals, including a pair of smooth seals and three pairs of centrally grooved seals. The grooved seals have groove depth to clearance ratios (Dg/C) of 5, 10, and 15. The radial clearance of each test seal is 0.0891 mm. Test conditions include three shaft rotational speeds from 4000 to 10000 rpm, three inlet oil pressures from 24 to 70 bars, and seal dimensionless eccentricities from 0 (centered) to 0.7. For each pair of test seals, dynamic results include stiffness and damping coefficients; static results include stator position, attitude angles, and seal leakage. Stiffness, damping, and leakage are compared among the seal pairs with various groove depths. Results show that all rotordynamic coefficients consistently decrease with increasing seal groove depths, and seal leakage remains constant through varying groove depths. Additionally, a comparison is made between experimental results of all test seals and XLLubeGT. XLLubeGT is a computer model developed at Texas A&M University, which uses a Reynolds equation + energy equation model to predict dynamic performance of a grooved seal. It operates on the assumption that the groove is large enough to create separate lands within the seal, creating a zero or negligible pressure perturbation across the seal. A comparison with XLLubeGT shows that even the seal with the largest groove depth tested is not deep enough to agree with XLLubeGT predictions.
Graviss, Matthew Sheridan (2006). The influence of a central groove on static and dynamic characteristics of an annular liquid seal with laminar flow. Master's thesis, Texas A&M University. Texas A&M University. Available electronically from