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"NASA Technical Reports Server (NTRS) 19950024289: Numerical Simulation Of Flow In A Whirling Annular Seal And Comparison With Experiments" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 19950024289: Numerical Simulation Of Flow In A Whirling Annular Seal And Comparison With Experiments” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 19950024289: Numerical Simulation Of Flow In A Whirling Annular Seal And Comparison With Experiments
  • Author: ➤  
  • Language: English

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  • Internet Archive ID: NASA_NTRS_Archive_19950024289

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"NASA Technical Reports Server (NTRS) 19950024289: Numerical Simulation Of Flow In A Whirling Annular Seal And Comparison With Experiments" Description:

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The turbulent flow field in a simulated annular seal with a large clearance/radius ratio (0.015) and a whirling rotor was simulated using an advanced 3D CFD code SCISEAL. A circular whirl orbit with synchronous whirl was imposed on the rotor center. The flow field was rendered quasi-steady by making a transformation to a totaling frame. Standard k-epsilon model with wall functions was used to treat the turbulence. Experimentally measured values of flow parameters were used to specify the seal inlet and exit boundary conditions. The computed flow-field in terms of the velocity and pressure is compared with the experimental measurements inside the seal. The agreement between the numerical results and experimental data with correction is fair to good. The capability of current advanced CFD methodology to analyze this complex flow field is demonstrated. The methodology can also be extended to other whirl frequencies. Half- (or sub-) synchronous (fluid film unstable motion) and synchronous (rotor centrifugal force unbalance) whirls are the most unstable whirl modes in turbomachinery seals, and the flow code capability of simulating the flows in steady as well as whirling seals will prove to be extremely useful in the design, analyses, and performance predictions of annular as well as other types of seals.

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