高压液氧涡轮泵孔型/蜂窝阻尼密封的设计

针对某型火箭发动机高压液氧涡轮泵离心轮的前、后凸肩动密封,采用孔型/蜂窝阻尼密封代替原始迷宫密封方案,并对密封结构参数进行优化设计,旨在减小泵内动静间隙泄漏,提高泵容积效率.采用经水工质孔型密封泄漏量实验数据验证的,基于k-ε 湍流模型和三维定常Reynolds-Averaged Navier-Stokes(RANS)...

Design of the hole-pattern/honeycomb seals in the high-pressure liquid oxygen turbopump

To reduce the leakage flow rates and improve the operation efficiency of the turbopump,as the replacement sealing scheme of the conventional labyrinth seal,the hole-pattern seal and honeycomb seal were designed and optimized for the front and rear shoulder rotating seals of the high-pressure liquid oxygen turbopump in a liquid rocket engine.The present numerical method based on the RNG k-εturbulence model and steady RANS solutions were validated by comparisons to experiment data of leakage flow rates of a water-fed hole-pattern seal at different rotational speeds.The influences of the hole depth and hole diameter on the leakage performance of the hole-pattern and honeycomb seals were numerically investigated,and comparisons to the conventional labyrinth seal were also presented.The leakage flow rates were computed for the hole-pattern seal with continuously variable hole depth(0.1~2.0 mm)at different hole diameters(0.3~2.0 mm).The results show that with the same hole geometry parameters(depth and diameter),the hole-pattern seal and the honeycomb seal possess the similar sealing performance which are both better than the conventional labyrinth seal.With the constant seal axial length,the leakage flow rates of the hole-pattern/honeycomb seals firstly decrease and then increase with the increasing hole diameter whose optimum value is 1.4 mm in this paper.For all the hole diameter cases,the hole-pattern/honeycomb seal possess the optimum ratio of the hole depth to diameter 0.5,where the best sealing performance were obtained.Compared to the conventional labyrinth seal,the leakage flow rates through the front and rear rotating seals of the high-pressure liquid oxygen turbopump were reduced by about 19%and 21%respectively,when the optimized hole-pattern/honeycomb seal were introduced.