...S. J. Payne; A. J. W. Moxon The aspirating probe has recently been successfully used to measure entropy within a turbomachine; however, it was found that its sensitivity to total pressure and total temperature fluctuations was significantly altered at high frequencies. If the aspirating probe...

... to the local flow conditions, uses the most suitable fluctuation splitting (FS) scheme at each cell of the computational domain. The viscous terms are discretized using a standard Galerkin finite element scheme. The eddy viscosity is evaluated by means of the Spalart-Allmaras turbulence transport equation...

... Division, May 21, 2004; revised manuscript received, May 27, 2004. Editor: D. Wisler. 21 May 2004 27 May 2004 29 12 2004 compressors surge protection fluctuations flow instability pipe flow In light of recent attempts to increase the stability margin of a compressor...

... and Exposition. Manuscript received by the Heat Transfer Division, March 2002, final revision, July 2002. Paper No. 2002-HT-32740. Associate Editor: R. Bunker. 01 March 2002 01 July 2002 26 03 2004 boundary layers Navier-Stokes equations turbulence fluctuations computational fluid...

...) have been considered at low (0.5%) and high (8.5% inlet) free-stream turbulence levels. Three different bars were considered, with heights ranging from 0.2% to 0.7% of suction surface length. Mean and fluctuating velocity and intermittency profiles are presented and compared to results of baseline...

... was identified in a Stanton number previously defined using a near-wall streamwise velocity fluctuation, St ′ . A new near-wall Stanton number was introduced; this parameter was regarded as a constant in a two-region boundary layer model on which the new correlation is based. Contributed...

... of the fluctuations in the laminar boundary layer from values of the freestream turbulence intensity and length scale, and hence determining the start of transition without resorting to any empirical correlation. Contributed by the International Gas Turbine Institute and presented at the International Gas...

...N. A. Cumpsty compressors rotors rotational flow pressure measurement aerodynamics vortices fluctuations One is always pleased to see another paper from the compressor facility in Kyushu and the authors are to be congratulated on the meticulous measurements they have made...

...N. A. Cumpsty [S0889-504X(00)01303-9] gas turbines measurement systems compressors probes flow control pressure sensors fluctuations stagnation flow This paper and its two companions (Parts 1&2) describe careful and meticulous work and I therefore hesitate to offer any...

... tip section have been evaluated from the time-dependent ensemble-averages of the casing wall pressure distribution. The force fluctuation due to the short length-scale cells is somewhat smaller than that for the long length-scale cell. The blade suffers two peaks of the force during a period...

... was 0.5 axial rotor chord downstream of the rotor trailing edge at midspan. While the measurement position remained fixed, the nozzle guide vane (NGV) was “clocked” to 12 positions covering one NGV pitch. The periodic fluctuations of the total pressure downstream of the turbine stage indicate that the NGV...

... the time dependency, several ensemble-averaging procedures for flow pressure and velocity are utilized for separating deterministic from stochastic fluctuations, extracting blade row finger prints or investigating low-frequency surge type fluctuations. With respect to the selection and overall optimization...

... rotor-governed systematic fluctuations (like blade-to-blade phenomena) alone or in combination with flow-governed low-frequency fluctuations as rotating stall (RS) and mild surge (MS). However, three-sensor probes would be needed to measure stochastic (turbulence-related) or other aperiodic velocity...

... intensities. Evidence was gathered that suggests that relatively low-frequency, large-scale eddies in the free stream buffet the boundary layer, causing boundary layer unsteadiness at the same low frequencies. These fluctuations are present in both transitional and fully turbulent boundary layers...