Abstract A numerical method using the multiple frequencies elliptical whirling orbit model and transient Reynolds-averaged Navier–Stokes (RANS) solution was proposed for prediction of frequency dependent rotordynamic coefficients annular gas seals. The excitation signal waveform that acts as motion rotor center. RANS combined with mesh deformation utilized to solve leakage flow field in seal obtain response forces on surface. Frequency were determined by transforming dynamic monitoring data...

Numerical investigations on the rotordynamic characteristics of a typical hole-pattern seal using transient three-dimensional Reynolds-averaged Navier–Stokes (RANS) solution and periodic circular orbit model were conducted in this work. The unsteady solutions combined with mesh deformation method utilized to solve RANS equations obtain reaction forces rotor at five different excitation frequencies. relation between frequency dependent coefficients was obtained by considering (including...

Effects of pressure ratio and rotational speed on the leakage flow cavity characteristics rotating staggered labyrinth seal were investigated by means experimental measurements numerical simulations. The test rig with turbine flowmeter measuring instruments was utilized to investigate at eight ratios five speeds. repeatability data demonstrated three times different fixed speed. three-dimensional Reynolds-averaged Navier–Stokes equations standard k-ε turbulent model also applied study...

Abstract Three-dimensional Reynolds-averaged Navier–Stokes (RANS) solutions from CFX were utilized to investigate the leakage flow characteristics in labyrinth honeycomb seal of steam turbines. At first, accuracy and reliability RANS approach was demonstrated using published experimental data seal. It showed that numerical method has sufficient precision predict performance seals. Then a range sealing clearances, cell diameters, depths, rotation speeds, pressure ratios investigated determine...

The project review information plays an important role in the recommendation of experts. In this paper, we aim to determine expert's rating by using historical records and final decision results on previous projects, means some rules, construct a matrix for projects For data sparseness problem "cold start" new expert recommendation, assume that those projects/experts with similar topics have feature vectors propose collaborative algorithm based topic relationship. Firstly, obtain latent...

Tooth bending damage resulting from an intense impact by the rotor sometimes occurs in transient operation. To investigate influence of after-damage clearance and tooth length on leakage performance rotordynamic coefficients labyrinth seals, three damages were taken into consideration, including unbent (abbreviated as Unbent), partial Pbent) complete Cbent). The CFD solution was utilized to calculate flow rates seals with clearances 0.3, 0.4, 0.5, 0.6 mm for damages. obtained result shows...

Spectral proper orthogonal decomposition (SPOD) is performed to identify the spatiotemporal coherent structures of trailing edge cutback film cooling flows. The analyzed data obtained from delayed-detached eddy simulation are validated against experimental first, followed by extraction SPOD modes and reconstruction flow fields using modes. Results show that topology flows mainly determined blowing ratio. At low ratios, vortex shedding phenomenon captured first leading mode. Its mode shape...

Abstract The viscous work generated by the rotating components of a seal not only represents direct loss power but also causes an increase in total temperature fluid (windage effect). In order to study discharge and characteristics stepped labyrinth seals with smooth honeycomb lands, 3D Reynolds-averaged Navier–Stokes solutions from CFX is used this work. At first, influences inlet preswirl, leakage flow rate, rotational speed on convergent divergent lands are conducted. obtained numerical...

Three-dimensional Reynolds-averaged Navier–Stokes solutions are employed to investigate the discharge and total temperature increase characteristics of stepped labyrinth seal with honeycomb land. First, relations between windage heating number circumferential Mach at different Reynolds numbers for seals calculated compared experimental data. The obtained numerical results show that present three-dimensional periodic model can properly predict in seals. Then, a range pressure ratios, three...

Brush seals have found increasing use in turbomachinery within the past decade due to their superior sealing performance and flexible nature. The flow characteristics fundamental behavior of single brush seal are known. However, multi-stage combined with labyrinth teeth still requires further research. This article presents a detailed investigation into for turbine applications. leakage rate through two-stage was measured using rotating test rig at three operating clearances four rotational...

To support the knowledge discovery and decision making from large-scale, multi-dimensional, continuous data sets, novel systems of visual analytics need capability to identify hidden patterns in that are critical for in-depth analysis. In this paper, we present a work-centered approach complex sets by combining user-centered interactive visualization data-oriented computational algorithms. We design implement specific system prototype, Learning-based Interactive Visualization Engineering...