CAJ | 학술논문

为考察端面密封在低黏度介质润滑条件下的特性，采用液氮介质模拟高速涡轮泵低黏介质润滑环境，通过对液氮介质润滑的端面密封进行2 s升速至2.9万转的快变升速过程以及120 s的稳定运行过程的试验研究，获得快变过程的端面温度、泄漏量、摩擦力、摩擦因数等各项密封性能数据。结果表明：随着转速增加，端面温升上升，液氮介质汽化出现两相现象，密封副处在干摩擦状态；当转速上升至24000 r/min时密封泄漏量明显增加，但未超标；密封系统运转开始时，端面间干摩擦条件下的摩擦力较大，最大摩擦因数值为0.27，随着转速的逐渐增加，摩擦因数逐渐减小，最小摩擦因数为0.14。
위고찰단면밀봉재저점도개질윤활조건하적특성，채용액담개질모의고속와륜빙저점개질윤활배경，통과대액담개질윤활적단면밀봉진행2 s승속지2.9만전적쾌변승속과정이급120 s적은정운행과정적시험연구，획득쾌변과정적단면온도、설루량、마찰력、마찰인수등각항밀봉성능수거。결과표명：수착전속증가，단면온승상승，액담개질기화출현량상현상，밀봉부처재간마찰상태；당전속상승지24000 r/min시밀봉설루량명현증가，단미초표；밀봉계통운전개시시，단면간간마찰조건하적마찰력교대，최대마찰인수치위0.27，수착전속적축점증가，마찰인수축점감소，최소마찰인수위0.14。
In order to investigate the characteristics of face seal in the condition of low viscosity lubrication,liquid ni-trogen was used to simulate low viscosity lubricating environment of high-speed turbopump.Face temperature,leakage, friction force,friction coefficient and other sealing performance data were acquired from the experimental study:rapidly varying up process for liquid nitrogen lubricated face seal that rotational speed is accelerated to 29 000 r/min in 2 s and 120 s of steady running.The experimental results show that the end face temperature is increased with the increasing of ro-tational speed,and two-phase phenomenon is generated for liquid nitrogen because of vaporization.Therefore,sealing is in the state of dry friction.When the rotational speed is up to 24 000 r/min,the sealing leakage is increased significantly and sealing is in the off state.When sealing system begins to operate,friction force between end faces in the state of dry friction is larger,and the maximum friction coefficient is 0.27 .The friction coefficient is decreased gradually with the in-creasing of speed,and the minimum value is 0.14.