溝付シールの安定性向上と漏れ量低減 : 第2報, 平行溝付シールとスパイラル溝付シールの入り口側溝内にスワールブレーカを設けた場合

概要

論文の詳細を見る
The second report of this study represents the measured leakage, rotordynamic coefficients, and effective damping coefficients for several types of Swirl Braked Grooved Seals (SBGS) with circumferentially or helically grooved stator. The tested SBGS have either 10 circumferential grooves or multi-helical grooves. Several swirl breakers are placed in the 1st and the 2nd grooves (stages) counted from the inlet zone. These swirl breakers are small metallic cuboids installed inside of grooves (per pendicular to the circumferential or the helical direction) in order to prevent the circumferential flows. For the circumferentially grooved stator seals, swirl breakers in the grooves of the 1st and the 2nd stages can decrease cross-coupled stiffness, increase direct stiffness, and have little influence on direct damping and leakage. The stability of the helically grooved stator seals isn't improved by the swirl breakers because of the increase of cross-coupled stiffness, and the decrease of direct damping. The swirl breakers in the helical grooves, however, reduce the leakage very much.
一般社団法人日本機械学会の論文
2001-09-25