Inter and Intrablade Row Laser Velocimetry Studies of Gas Turbine Compressor Flows

1988 ◽  
Vol 110 (3) ◽  
pp. 369-376 ◽  
Author(s):  
M. C. Williams
Keyword(s):  
Data Acquisition ◽  
Gas Turbine ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Fan Studies ◽  
Data Rates ◽  
Recorded Data ◽  
Multistage Compressor ◽  
Gas Turbine Compressor

Characterization of the aerodynamics of the flows within gas turbine intrablade passages requires the development of sensitive laser-Doppler velocimeters, a data acquisition system capable of efficiently and accurately handling substantial quantities of data, and appropriate methods of posttest data analysis and display to maximize the value of the recorded data. Pratt & Whitney developed a confocal LDV and data acquisition system that were first employed in the mid-1970s for gas turbine intrablade fan studies. Experience gained through use of the instruments in several aerodynamic studies has provided the basis for the development of a second generation system. The performance of the recently enhanced instrument configured as a single-component LDV has been demonstrated by a NASA-sponsored fan study in which approximately 200 million valid velocity signals were rapidly acquired. The high resolution and data rates achieved permitted detailed mappings of the flow at a variety of conditions and locations. Following this successful study, a second NASA-sponsored program was initiated to assess the feasibility of utilizing this LDV capability to perform detailed stator–rotor interaction studies in a multistage compressor. The equipment employed in these studies will be described and data typical of the findings will be presented.

scholarly journals The Mark IV VLBI Data-Acquisition and Correlation System

1993 ◽  
Vol 156 ◽  
pp. 151-157
Author(s):  
Alan R. Whitney
Keyword(s):  
Data Acquisition ◽  
Cost Effective ◽  
Data Acquisition System ◽  
Data Rate ◽  
Acquisition System ◽  
The Past ◽  
Vlbi Observations ◽  
Data Rates ◽  
Correlation System ◽  
Vlbi Data

Modern VLBI observations for both astronomy and geodesy continue to demand the utmost in sensitivity. Of the methods potentially available for increasing the sensitivity of continuum VLBI observations, increasing the recorded bandwidth is generally the most cost effective.Over the past two years a broadly-supported program has been underway at Haystack Observatory to increase the sensitivity of the Mark IIIA VLBI system by more than a factor of 2. The result is an upgrade to the existing Mark IIIA data-acquisition system, dubbed Mark IV, which increases the maximum data rate to 1024 Mbits/sec, more than quadrupling the maximum data-rate of the Mark IIIA.A new correlator, based on a new custom VLSI correlator chip is also being designed to support the 1 Gbit/sec data rates from the Mark IV data-acquisition-system. An international collaborative effort is being mounted to help defray the high costs of development.

scholarly journals Infrared Arrays at the European Southern Observatory

1995 ◽  
Vol 167 ◽  
pp. 81-92
Author(s):  
G. Finger ◽  
G. Nicolini ◽  
P. Biereichel ◽  
M. Meyer ◽  
A. F. M. Moorwood
Keyword(s):  
Data Acquisition ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Large Format ◽  
High Data ◽  
Array Detectors ◽  
Very Large Telescope ◽  
Data Rates ◽  
Array Camera ◽  
Infrared Array

This paper gives an overview of infrared array detectors which have been tested and used at ESO. The performance of arrays using Reticon type readouts, CCD readouts and switched FET multiplexers have been evaluated for both InSb and Hg1−xCdxTe detectors. Performance limitations specific to the NICMOS3 256 × 256 Hg1−xCdxTe detector installed in the ESO infrared array camera IRAC2 are addressed. The first test results with a high well capacity SBRC 256 × 256 InSb array are also presented.Advanced readout techniques for image sharpening tested on a 2.2-m telescope are discussed briefly. A new generation of instruments being built for the VLT, the very large telescope project of ESO, is designed to house large format 1024 × 1024 IR arrays. A fast data acquisition system is currently being developed at ESO. The system is capable of handling the high data rates generated in the thermal infrared by large format low well capacity arrays. It can also cope with the low read noise required for flux levels of ≤ one photon/sec. It will first be installed in ISAAC, the Infrared Array Camera and Spectrometer built for the VLT (Moorwood 1993). The present status of both the detector developments and the data acquisition system is reviewed.

scholarly journals Full Load Development Testing of a 41MW Single Shaft Generator Drive Gas Turbine

1986 ◽  
Author(s):  
Simon T. O’Neill
Keyword(s):  
Data Acquisition ◽  
Gas Turbine ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Test Facility ◽  
Full Load ◽  
Test Instrumentation

This paper describes the full load development testing of the CW251B10 gas turbine at the Westinghouse Canada gas turbine test facility in Hamilton, Ontario. The test instrumentation and data acquisition system are detailed together with the nature of the tests performed.

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