Computational and Experimental Investigations of Straight-Through Labyrinth Seals

Prasad, B. V. S. S. S.; V.S.Manavalan,; Rao, N. N. Narayan

doi:10.1115/97-gt-326

Cited by 15 publications

(8 citation statements)

References 13 publications

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Section: Numerical Model and Research Objectmentioning

confidence: 98%

“…In the calculation of labyrinth leakage flow, the accuracy of CAM is validated by the data of Prasad [35]. Prasad et al tested the straight-through labyrinth shown in Figure 2, and obtained the flow characteristics of the labyrinth under 12 working conditions (pres- Considering the advantages of the two-dimensional method in the simulation of full-aeroengine and the non-negligible influence of the seal cavity leakage flow on the performance of turbomachinery, we have reason to believe that a two-dimensional throughflow program considering seal cavity leakage flow can undoubtedly assist in the performance prediction of an aeroengine.…”

Section: Numerical Model and Research Objectmentioning

confidence: 99%

“…Prasad et al tested the straight-through labyrinth shown in Figure 2, and obtained the flow characteristics of the labyrinth under 12 working conditions (pressure ratio from 1.0031 to 1.8974). See reference [35] for details of test pieces and test equipment. For the case that the clearance between the labyrinth teeth Cl = 0.36 mm, they also calculated with Fluent.…”

Section: Numerical Model and Research Objectmentioning

confidence: 99%

“…sure ratio from 1.0031 to 1.8974). See reference [35] for details of test pieces and test equipment. For the case that the clearance between the labyrinth teeth Cl = 0.36mm, they also calculated with Fluent.…”

Section: Numerical Model and Research Objectmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of Seal Cavity Leakage Flow Effect on Multistage Axial Compressor Aerodynamic Performance with a Circumferentially Averaged Method

Jin

Gui

2021

Applied Sciences

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The seal cavity leakage flow has a considerable impact on the performance of the aeroengine, especially on the multistage compressor. Thus, a quasi-three-dimensional simulation program named CAM is developed basing on circumferentially averaged throughflow method. The program enables a rapid diagnosis for the performance degradation of multistage compressor caused by labyrinth wear. The coupling flow field between the seal cavity leakage flow and the main flow field at the root of the shrouded stator of a high-loading three-stage compressor with inlet guide vanes (IGV) was simulated by CAM and the results indicate that seal cavity leakage flow has a significant impact on the overall performance of the compressor. That is, for a 1% increase in the seal-tooth clearance-to-span ratio, the decrease in total pressure ratio was 2.6%, and the reduction in efficiency was 0.6%. Stage performance shows that the seal cavity leakage flow reduces the pressurization capacity of the current stator and the work capacity of the downstream rotor, but has little effect on the upstream blade row. Spanwise distribution of blade element performance shows that the leakage flow leads to an increased flow blockage near the hub, resulting in spanwise migration. The incidence of the stator and rear rotor then change through the entire span. The leakage flow leads to the flow blockage and migration and hence changes the incidence angle, which results in the deterioration of compressor performance.

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Section: Numerical Model and Research Objectmentioning

confidence: 98%

Section: Numerical Model and Research Objectmentioning

confidence: 99%

Section: Numerical Model and Research Objectmentioning

confidence: 99%

Section: Numerical Model and Research Objectmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of Seal Cavity Leakage Flow Effect on Multistage Axial Compressor Aerodynamic Performance with a Circumferentially Averaged Method

Jin

Gui

2021

Applied Sciences

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“…They also presented the traditional rotordynamic model used for predicting the reaction force components of an annular gas seal. Prasad et al [8][9][10] had performed both experimental and numerical investigations of different labyrinth configurations, namely, straight-through, inclined and radial labyrinth seals. Kim and Cha [11] presented a comparative analysis of the influence of configuration and clearance on the leakage behavior of labyrinth seals using CFD and reported leakage flow pattern for various clearances.…”

Section: Introductionmentioning

confidence: 99%

Influence of combined radial location and growth on the leakage performance of a rotating labyrinth gas turbine seal

2015

Self Cite

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Leakage characteristics, influenced by centrifugal and thermal radial growth are determined computationally for a generic rotating labyrinth seal used in the gas turbine secondary air system. Three seal locations, namely, R25, R50 and R75 are represented by means of varying the rotor radius mimicking different radial positions of the seal from the shaft axis. The combined influence of seal location and its radial (Centrifugal and thermal) growth on the leakage performance is investigated for a wide-ranging speeds from 1000 to 3000 rad/s, temperatures ranging from 200 to 450 o C and pressure ratios varying from 1.1 to 2.5, for a chosen initial clearance of 500 micron. A comparison of the effect of rotation and temperature gradient among different rotors shows that the radial growth and leakage flow rates significantly vary with the increasing radius.

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Experimental investigation of effect of tooth geometrical parameters to flow characteristics in slant labyrinth seals

Zhang

Dou

Hong

et al. 2018

Concurrency and Computation

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Summary An experiment investigation was made to study the influence of the geometry parameters of slant straight‐through labyrinth seals on sealing characteristics. 22 models with different geometry parameters were designed, and the geometry parameters studied include seal clearance, fin height, fin pitch, fin tip thickness, and fin number. The results showed that, when p0/pn ranged from 1.2 to 1.8, the discharge coefficient increased with the drop pressure ratio, seal clearance, and fin tip thickness and decreased with fin height, fin pitch, and fin number. The rank of sensitivity of each parameter's variation in the unit size on sealing characteristics is seal clearance, fin tip thickness, fin pitch, back angle, fin height, and front angle. The correlation of different parameters were summarized for the designing of advanced labyrinth seals.

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Computational and Experimental Investigations of Straight-Through Labyrinth Seals

Cited by 15 publications

References 13 publications

Investigation of Seal Cavity Leakage Flow Effect on Multistage Axial Compressor Aerodynamic Performance with a Circumferentially Averaged Method

Investigation of Seal Cavity Leakage Flow Effect on Multistage Axial Compressor Aerodynamic Performance with a Circumferentially Averaged Method

Influence of combined radial location and growth on the leakage performance of a rotating labyrinth gas turbine seal

Experimental investigation of effect of tooth geometrical parameters to flow characteristics in slant labyrinth seals

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