%0 Journal Article %T Performance evaluation of trapezoidal teeth labyrinth seal %J Energy Equipment and Systems %I University of Tehran %Z 2383-1111 %A Abdous, Razie %A Zirak, Saadat %D 2017 %\ 09/01/2017 %V 5 %N 3 %P 265-273 %! Performance evaluation of trapezoidal teeth labyrinth seal %K Labyrinth %K Seal %K Trapezoidal %K Number of Teeth %K tip clearance %K Leakage Flow %K CFD %R 10.22059/ees.2017.27567 %X The present paper investigates the effects of the trapezoidal teeth labyrinth seal on the leakage amount in gas turbines. The influences of increasing the number of teeth from 1 to 6 with step 1 and the tip clearance s=0.5 to 7.5 mm on the leakage flow at different pressure ratios of PR=1.5, 2 and 2.5 are examined, comprehensively. The analysis is performed numerically using a Finite-Volume software with the k-ε turbulent model. The obtained results show a good agreement in comparison with the other research results. The results show that an increase in the number of teeth causes a decrease in the leakage flow. An increase in the tip clearance (s) from 0.5 mm to around 7.5 mm leads to a decrease in the leakage flow, like the step labyrinth behavior, while an increase beyond 7.5 mm results into a leakage increase, the behavior of the straight labyrinth. %U https://www.energyequipsys.com/article_27567_fa3a31c22c518c8887b2aec0181efe6a.pdf