Effect of T-groove Parameters on Steady-State Characteristics of Cylindrical Gas Seal

Abstract

Gas film seal technology is becoming increasingly important as an advanced new rotary shaft seal technology in aviation engines and industrial gas turbines. In this paper the impacts of several parameters of T-groove cylindrical gas seal such as groove number, groove depth, groove width ratio, dam groove width ratio and floating ring length on the steady-state characteristics of cylinder film seal are studied in detail by the method of control variable using computational fluid dynamics software, and the focuses are on the pressure distribution, the gas film stiffness, and the leakage. Results show that with the increase of the number of grooves, the gas film stiffness increases gradually, but the leakage and leakage stiffness ratio decrease. The results also show that with the increase of groove depth, there is a maximum value for the gas film stiffness and a minimum value forleakage. This research plays an important role in guiding the design and the application of cylindrical gas seal.