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Deconvolution technique for line-of-sight optical scattering measurements in axisymmetric sprays
Applied Optics
|March 24, 2010
Summary
A new method deconvolutes spray measurements to reveal droplet size and density variations. Spline smoothing improves accuracy, with errors up to 15% in the spray center.
Area of Science:
- Fluid dynamics
- Optical diagnostics
- Spray analysis
Background:
- Line-of-sight average measurements are common for analyzing sprays.
- Determining radial variations in droplet size and density is crucial for spray characterization.
- Existing methods struggle with accurate radial deconvolution.
Purpose of the Study:
- To develop a procedure for deconvoluting line-of-sight average measurements.
- To determine radial variations of droplet-size distribution and droplet number density.
- To analyze axisymmetric sprays with improved accuracy.
Main Methods:
- Developed a deconvolution procedure for spray data.
- Utilized spline smoothing for preconditioning line-of-sight average data.
- Performed a worst-case error analysis.
Main Results:
- The procedure accurately deconvolutes radial variations in droplet-size distribution and number density.
- Spline smoothing is essential for maintaining accuracy in the spray's central region.
- Uncertainties in average data propagate approximately 1:1 into deconvoluted results.
- Cumulative truncation errors reached up to 15% in the central spray region.
Conclusions:
- The developed deconvolution procedure enables accurate radial profiling of spray characteristics.
- Spline smoothing is a critical step for reliable spray analysis.
- The method is applicable to various spray types, including hollow-cone sprays.
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