Overtip Pressure Measurements in a Cold-Flow Turbine Rig

1990 ◽  
Author(s):  
R. C. Kingcombe ◽  
I. M. Smith ◽  
R. V. Steeden
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
Significant Loss ◽  
Rotor Blades ◽  
Pressure Measurements ◽  
Pressure Transducers ◽  
Cold Flow ◽  
High Frequency Response ◽  
Axial Turbines

In shroudless axial turbines the flow over the tips of the rotor blades is complex and accounts for significant loss of efficiency. In order to investigate the structure of this overtip flow, a row of high frequency response miniature pressure transducers was mounted in the casing of a cold flow turbine rig in the region swept by the rotor tips.

Development and Evaluation of a High Frequency Response Signal Conditioning Amplifier for Miniature, Silicon Bridge-Type Pressure Transducers

2012 ◽  
Author(s):  
J. Ilott ◽  
W. D. E. Allan
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
Wide Band ◽  
Pass Band ◽  
Signal Conditioning ◽  
Band Frequency ◽  
Differential Signal ◽  
Pressure Transducers ◽  
High Frequency Response ◽  
Experimental Apparatus

In addition to their small size, miniature silicon pressure transducers offer wide-band frequency response. Taking advantage of the high-frequency response of these pressure transducers within an electrically noisy environment requires high bandwidth amplification and anti-alias filtering. This paper describes a signal conditioning amplifier that provides for linear phase filtering of a differential or single-ended input signal and outputs a differential signal. Differential signals are suitable for driving long cable runs that may be required when digital recording hardware cannot be located in close proximity to experimental apparatus. The design has also been shown to exhibit nearly constant group delay over the pass-band, reducing the need for substantial oversampling of the pressure transducer signals to avoid the nonlinear phase response typical of low-pass filters in the vicinity of their cut-off frequency. Testing has shown the module to provide a very flat pass-band response while achieving a high-order filter response at the cut-off frequency, along with excellent steady state DC accuracy.

Transonic Fan Tip-Flow Features Revealed by High Frequency Response Over-Tip Pressure Measurements

2008 ◽  
Author(s):  
Hyoun-Woo Shin ◽  
William Solomon ◽  
Aspi Wadia
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
Pressure Rise ◽  
Tip Leakage Flow ◽  
Complex Flow ◽  
Phase Lock ◽  
Pressure Transducers ◽  
High Frequency Response ◽  
Wall Boundary Layer ◽  
Transonic Fan

Data from an array of high frequency response pressure transducers embedded in the casing wall over the tip of a transonic fan are reported. Phase-lock averaging of data from this array was successful in resolving an axial-tangential map of the static pressure rise in the rotor tip, as has been reported by other workers. Phase-lock ensemble RMS processing of the data is shown to be a useful technique that provides insight into the flow physics around the blade tip. Comparison with CFD results allows for more definite identification of features observed in the data. A complex flow field involving the casing wall boundary layer, the blade shock system and the over-tip leakage flow is observed. Differences between CFD data and measurements are explored by way of computational sensitivity studies. Results are reported for a range of throttle settings and speeds.

High Frequency Response of Magnetization of Thin-Film Heads

1992 ◽  
Vol 7 (10) ◽  
pp. 773-778
Author(s):  
S. Narumi ◽  
S. Sudo ◽  
M. Aihara ◽  
H. Fukui
Keyword(s):  
Thin Film ◽  
Frequency Response ◽  
High Frequency ◽  
High Frequency Response
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