静子面动压槽深分布对双流环密封瓦浮起和温升特性影响研究OA

To address the problems of circumferentially non-uniform temperature distribution caused by eccentric clearance in classical double-flow ring seal pads,a novel variable-depth groove seal pad was proposed,featuring grooves with circumferentially varying depth on the air-side and hydrogen-side sealing surfaces.Considering fluid-structure thermal interactions,a conjugate heat transfer model was employed to numerically solve the flow fields in the sealing gaps and temperature field distribution of the double-flow ring seal pads.Comparative analyses of the lift-off and temperature rise characteristics of three seal pads with smooth,constant-depth groove,and variable-depth groove were conducted under both of specified ec-centricity and radial force balance conditions.The influence law and mechanism of groove designs and groove depth variation on the static surfaces were also investigated.The results indicate that variable-depth groove seal pads may overcome the limitation of zero lift force at zero eccentricity inherent in traditional smooth and constant-depth groove seal pads.By selecting an appropriate groove depth variation ratio,zero-eccentricity operation may be achieved to balance the self-weight of different seal pads.Compared to smooth seal pads,grooved seal pads exhibit significant improvements in eccentricity,maximum tempera-ture rise on the air and hydrogen sides,and circumferential temperature uniformity within the sealing gaps.However,these improvements come at the cost of increased flow rates of lubricating oil on both of the hy-drogen and air sides.