Topic
Tip clearance
About: Tip clearance is a research topic. Over the lifetime, 2637 publications have been published within this topic receiving 32671 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the authors measured the tip clearance of a gas turbine engine in real-time, and showed that it is one of the important parameters affecting the performance, safety and stability of a turbine engine.
Abstract: Blade tip clearance is one of the important parameters affecting the performance, safety and stability of a gas turbine engine. However, it is difficult to measure the tip clearance in real time an...
27 citations
01 Jun 1999
TL;DR: In this article, a three-dimensional computational methodology for multistage turbomachinery flows is developed, validated and applied in analysing the reduced mass flowrate operation of a four-stage turbine.
Abstract: In this paper a three-dimensional computational methodology for multistage turbomachinery flows is developed, validated and applied in analysing the reduced mass flowrate operation of a four-stage turbine. The flow is modelled by the three-dimensional Favre-Reynolds-averaged Navier-Stokes equations using the Launder-Sharma near-wall k-ɛ turbulence closure, which are integrated using an implicit third-order upwind solver. The computation models the eight blade rows, including the tip clearance gaps of the rotors, using a 6 × 106 points grid, and computes the time-averaged flow using mixing planes between rows. Computational results are compared with measurements for various operating points. After this validation the method is used in a first attempt to analyse the three-dimensional flow at reduced-mass-flow operation.
27 citations
TL;DR: In this article, several design models of centrifugal pump impellers were tested in water to determine tip-clearance effects on noncavitating and cavitating performance, and three direct comparisons for shrouded versus unshrouded models are included.
Abstract: Several design models of centrifugal pump impellers were tested in water to determine tip-clearance effects on noncavitating and cavitating performance. Although most of these impellers were designed without tip shrouds, three direct comparisons for shrouded versus unshrouded models are included. Within the scope of this investigation, varying degrees of tip clearance produced dissimilar trends in the hydraulic performance for the different design models tested. Fully shrouded impellers consistently yielded inferior cavitation performance as compared to unshrouded versions.
27 citations
TL;DR: A powerful computational technique, large-eddy simulation, has been used to study the detailed flow dynamics in the tip-gap region of hydraulic turbomachines as discussed by the authors, which can lead to reduced performance, increased noise, and structural vibration and erosion.
Abstract: A powerful computational technique, large-eddy simulation, helps researchers study the detailed flow dynamics in the tip-gap region of hydraulic turbomachines. LES also helps researchers investigate ways to mitigate undesirable effects, such as cavitation, which can lead to reduced performance, increased noise, and structural vibration and erosion.
27 citations