Results 261 to 270 of about 160,183 (291)

Compressor Blade Tip Timing Using Capacitance Tip Clearance Probes

Volume 1: Turbo Expo 2003, 2003
Turbomachinery blade vibrations of sufficient amplitude cause High Cycle Fatigue, which reduces blade life. In order to observe this vibration a non-intrusive monitoring system is sought. The vibration can be detected by measuring blade tip timing since in the presence of vibration the blade timing will differ slightly from the passing time calculated ...
Craig Lawson, Paul Ivey
openaire   +1 more source

Numerical simulation on the effect of tip clearance size on unsteadiness in tip clearance flow

Journal of Thermal Science, 2008
Unsteadiness of tip clearance flow with three different tip clearance sizes is numerically investigated in this paper. NASA Rotor 67 is chosen as the computational model. It is found that among all the simulated cases, the unsteadiness exists when the size of the tip clearance is equal to or larger than design tip clearance size.
Juan Du, Feng Lin, Hongwu Zhang, Jingyi Chen   +3 more
openaire   +1 more source

Periodic Unsteady Tip Clearance Vortex Development in a Low-Speed Axial Research Compressor at Different Tip Clearances

Journal of Turbomachinery, 2017
Since the early work on axial compressors, the penalties due to radial clearances between blades and side walls are known and are an ongoing focus of research work. The periodic unsteadiness of the tip clearance vortex (TCV), due to its interaction with the stator wakes, has only rarely been addressed in research papers so far.
Martin Lange, Matthias Rolfes, Ronald Mailach, Henner Schrapp   +3 more
openaire   +1 more source

Optimization Design of Tip Clearance Shape

2008 International Conference on Apperceiving Computing and Intelligence Analysis, 2008
The background is one aero-engine's structure. The shape of turbine tip clearance is researched, by the means of numerical analysis. Parametric modeling, process integration, and optimization of tip clearance shape were proposed. The detailed information of flow field shows that the numerical results agree well with experiment data.
Xing-Ming Qi, Zhi-Gang Hua, Jin-Yi Jiao
openaire   +1 more source

Tip-Clearance Effects in Centrifugal Pumps

Journal of Basic Engineering, 1965
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.
G. M. Wood, H. Welna, R. P. Lamers
openaire   +1 more source

Turbine Blade Tip Clearance Measurement Instrumentation

Volume 1: Turbo Expo 2007, 2007
New and future gas turbine engines are being required to provide greater thrust with improved efficiency, while simultaneously reducing life cycle operating costs. Improved component capabilities enable active control methods to provide better control of engine operation with reduced margin.
Eric B. Holmquist, Peter L. Jalbert
openaire   +1 more source

Tip Clearance Control Using Plasma Actuators

43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005
Abstract : This report documents experimental results from a series of experiments using active flow control to improve the performance and efficiency of turbine tip clearance flows. The flow control was based on plasma actuators. Two experimental facilities were used as part of this research project.
Scott Morris, Thomas Corke, Daniel VanNess, Julia Stephens, Travis Douville   +4 more
openaire   +1 more source

Endwall Profiling With Tip Clearance Flows

Volume 8: Turbomachinery, Parts A, B, and C, 2012
This paper describes the design of a non-axisymmetric profiled endwall with tip clearance flow. Previous designs have assumed that the interaction between the tip clearance flow and the endwall has been negligible and this paper allows this assumption to be tested.
Michael Hilfer, Grant Ingram, Simon Hogg
openaire   +1 more source

Turbine Blade Tip Clearance Improvement

Volume 1: Turbomachinery, 1991
A recently developed non-traditional design concept addressing turbine blade tip clearance reduction to provide long-term engine performance improvement and stability is presented. The concept is based on the direct attachment of the diaphragm, which supports Stage 1 integral nozzle and tips shroud segments, to the bearing housing, thus providing a ...
openaire   +1 more source

Fiber-optic laser Doppler turbine tip clearance probe

Optics Letters, 2006
A laser Doppler based method for in situ single blade tip clearance measurements of turbomachines with high precision is presented for what we believe is the first time. The sensor is based on two superposed fanlike interference fringe systems generated by two laser wavelengths from a fiber-coupled, passive, and therefore compact measurement head ...
Lars, Büttner, Thorsten, Pfister, Jürgen, Czarske   +2 more
openaire   +2 more sources