CAJ | 학술논문

　　为进一步提高雁型槽端面干气密封在低速、低压工况下的开启性能，在等深雁型槽的基础上对槽底结构进行变深优化，提出了收敛型锥度、收敛型阶梯、发散型锥度和发散性阶梯4种槽底变深结构。基于气体混合润滑理论，考虑密封端面粗糙度效应和端面间气体滑移流效应，建立了雁型槽端面干气密封动压开启分析模型，数值分析了槽底变深结构干气密封的气膜压力分布，研究了相对变深坡度、环颈深度和密封压力对变深雁型槽端面干气密封的临界开启转速和气膜刚度的影响。结果表明：与等深槽相比，槽底变深结构可提高密封端面间气膜承载能力和稳定性；在相对变深坡度λ＝3／8～4／8时，变深结构干气密封的临界开启转速 nc 取得最小值，且发散型变深结构略优于收敛型变深结构；相对变深坡度取最优值时，发散型结构干气密封的临界开启转速 nc 与等深槽相比降低了10．2％。
　　위진일보제고안형조단면간기밀봉재저속、저압공황하적개계성능，재등심안형조적기출상대조저결구진행변심우화，제출료수렴형추도、수렴형계제、발산형추도화발산성계제4충조저변심결구。기우기체혼합윤활이론，고필밀봉단면조조도효응화단면간기체활이류효응，건립료안형조단면간기밀봉동압개계분석모형，수치분석료조저변심결구간기밀봉적기막압력분포，연구료상대변심파도、배경심도화밀봉압력대변심안형조단면간기밀봉적림계개계전속화기막강도적영향。결과표명：여등심조상비，조저변심결구가제고밀봉단면간기막승재능력화은정성；재상대변심파도λ＝3／8～4／8시，변심결구간기밀봉적림계개계전속 nc 취득최소치，차발산형변심결구략우우수렴형변심결구；상대변심파도취최우치시，발산형결구간기밀봉적림계개계전속 nc 여등심조상비강저료10．2％。
In order to improve the opening performance of the goose groove under low velocity and low pressure condition , four kinds of bottom types of goose groove , namely convergent tapered bottom groove , convergent ladder-like bottom groove, divergent tapered bottom groove, divergent ladder-like bottom groove, was introduced by optimizing the equal deep goose groove .Based on the theory of gas mixed lubrication , a dynamic opening model for the goose groove dry gas seal was developed by considering the effects of gaseous slip flow and surface roughness .The gas film pressure distributions between the two faces of the five different bottom types of goose groove were numerically analyzed .A series of simulations were carried out to study the influences of relative depth-variation slope, the depth of annular neck, and sealed medium pressure on the critical opening rotational speed and gas film stiffness.The results show that the load capability and stability of the gas film are enhanced by the optimized bottom structure compared with the equal depth groove .The critical opening rotational speed of the depth -variation bottom structure is the lowest when the relative depth-variation slope is between 3 /8 and 4 /8, and the divergent bottom structures have slightly advantages than the convergent bottom structures .The critical opening rotational speed of the divergent bottom structures have 10.2% reduction compared with the equal deep goose groove when relative depth -variation slope is the best value.