论文部分内容阅读
为了研究工程实际尺寸下篦齿封严泄漏特性,设计并搭建了篦齿封严实验台.在进出口压比为1.1~2.0的条件下,探究了节流间隙、齿数、齿腔深度和宽度等对篦齿封严泄漏量和密封腔内压力分布的影响.结果表明:泄漏系数随着压比和节流间隙的提高而增加,但压比达到1.6后,增加趋势逐渐变缓;增加齿数能显著提高篦齿的封严性能,但随着齿数变多,效果逐渐减弱;较浅和较宽的齿腔对于提高篦齿的封严性能更有利;进出口压比、节流间隙和齿腔深度对于篦齿腔内压力系数的分布几乎没有影响;篦齿腔内沿程压力不断降低,但在各齿腔内降低的程度逐渐减小;在篦齿封严中,越接近入口的齿腔对密封性能提高的贡献越大,对封严性能的优劣起着决定性作用.
In order to study the labyrinth seal leakage under the actual size of the project, a labyrinth seal rig was designed and constructed.When the pressure ratio between inlet and outlet was between 1.1 and 2.0, the effects of throttle gap, number of teeth, depth and width of cavity Etc. The results show that the leakage coefficient increases with the increase of pressure ratio and throttling clearance, but when the pressure ratio reaches 1.6, the increasing trend gradually becomes slower; the number of teeth increases Can significantly improve the sealing performance of the labyrinth teeth, but as the number of teeth increases, the effect gradually weakened; shallow and wide tooth chamber for improving the performance of labyrinth seal more favorable; import and export pressure ratio, throttle gap and teeth The cavity depth has almost no effect on the distribution of pressure coefficient in the labyrinth cavity; the pressure along the laryngeal cavity decreases continuously, but decreases gradually in each cavity; in the labyrinth seal, the closer to the entrance tooth The greater the contribution of the cavity to the improvement of the sealing performance, the decisive effect on the quality of the sealing performance.