Laser-2-Focus data analysis using a nonlinear regression model

Förster, Wolfgang

doi:10.1109/iciasf.1995.519128

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…In short, the laser-2-focus measurement method is based on a time-of-flight measurement of a particle captured between the focuses of two laser beams [22][23][24][25][26][27][28]. The velocity is determined by means of the distance between the two foci and the corresponding time-of-flight.…”

Section: Laser-2-focus (L2f)mentioning

confidence: 99%

Characterization of SRM plumes with alumina particulate in subscale testing

et al. 2020

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The current paper provides an outline and first results of the ESA-EMAP project. This project pursues activities regarding the experimental modeling of alumina particulates in solid boosters (EMAP). The issue regards the particles residing in the atmosphere after the passage of a launch vehicle with solid rocket propulsion, which might contribute to local and overall ozone depletion. The question is to what extent since the particle size distribution left behind is essentially unclear. For this reason, the ESA-EMAP investigations focus on the characterization of the solid exhaust plume properties for well-defined combustion chamber conditions. Thus, details of the rocket motor assembly, of the developed solid propellant grains, and of first measurement results are provided. The paper presents technical findings concerning the rocket motors and reveals aspects to the feasibility of the applied measurement techniques.

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Section: Laser-2-focus (L2f)mentioning

confidence: 99%

Characterization of SRM plumes with alumina particulate in subscale testing

et al. 2020

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Analysis of Rotor-Stator-Interaction and Blade-to-Blade Measurements in a Two Stage Axial Flow Compressor

Ernst

Michel

Jeschke

2010

Journal of Turbomachinery

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In order to improve unsteady CFD analysis for turbomachinery applications, there is still the need for high quality experimental data for validation. The first aim of this paper is to represent a unique work in providing unsteady data for the purpose of a CFD test case. Second, a detailed analysis of rotor-stator-interaction in a multistage compressor is performed by means of accompanying frequency analysis of the blading and the tip leakage flow for different indexing positions. The transonic two stage axial flow compressor is equipped with integrally bladed rotors and vanes with hub and tip shrouds with regard to a modern high pressure jet engine compressor. For detailed flow measurements both intrusive and nonintrusive measurement techniques were used. Beside pressure probes mounted with a semiconductor and microstrain gauges applied to the blades and vanes, a three component Doppler laser-two-focus velocimeter was used. The results of the time resolved pressure traverse measurements in the axial gaps as well as the analysis of the tip leakage flow show the propagation of the wakes and the potential upstream influence, which can be clearly detected by the blade passing frequencies as well. Additionally, the results of the blade-to-blade measurements impart an idea of the intrarotor-transport of the fluid and the flow phenomena within the rotor. Beside the detailed flow analysis, the preferential aim of this paper is to establish a method for the detection of flow phenomena due to the blade-row-interaction by means of a frequency analysis. This paper shows that a correlation of the fast Fourier transform results of strain gauges and semiconductor probes in the axial gaps and tip leakage flow region is a very promising starting point, especially for the analysis of forced response operating points.

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Laser-2-Focus data analysis using a nonlinear regression model

Cited by 2 publications

References 5 publications

Characterization of SRM plumes with alumina particulate in subscale testing

Characterization of SRM plumes with alumina particulate in subscale testing

Analysis of Rotor-Stator-Interaction and Blade-to-Blade Measurements in a Two Stage Axial Flow Compressor

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