Gas-phase velocity estimation of Phase-Doppler Anemometry

This script estimates the gas-phase velocity from Phase Doppler Anemometry data. The package includes a sample to let you run the code.

This set of matlab scripts can be used to process Phase-Doppler Anemometry data to estimate the gas-phase velocity without using any rule of thumb. If you use the code, please cite:

Erika Rácz, Milan Malý, Jan Jedelský, Viktor Józsa: Gas-phase velocity estimation in practical sprays by Phase-Doppler technique, International Journal of Multiphase Flow, 157, 2022, paper 104260, DOI: 10.1016/j.ijmultiphaseflow.2022.104260

The scripts are ready to processs any database size. Description:

filtering.m:

1. Download filtering.m and the text file in an empty folder!

2. Section %%Parameters contains all the parameters needed to the calculation. More description in the code.

3. Section %%Load data reads the given text file.

4. Section %%Iteration and data processing contains all the calculations of the Stk filtering method.

5. Section %%Save results saves the results in 3 files.

The first one is a table called "resulttable.m". It contains some basic information about the original and the filtered data.

(original data is the preprocessed data, after outlier filtering)

The second one, database.mat, is a structure which contains D,v and Stk data after the outlier filtering

and the name of the text file.

The third one, datafilt.mat, is another structure containing the filtered data.

6. After running this script, the results are available to create plots with the next two scripts:

a) meanstd_velocity.m:

The code creates a figure with 3 diagrams:

- The first shows the mean velocity of droplets with diameter up to D based on the method presented in the publication.

- The second shows the standard devaition of velocity.

- The third shows the relative standard deviation of velocity, which is the ratio of the mean velocity and the standard

deviation.

The figure is saved in D-v.jpg.

b) D_v_byStk:

The code creates a figure with two diagram. They show the droplet size-velocity distribution coloured by the droplet

Stk value. The first diagram contains the original data and the second one contains the filtered data.

The figure is saved in Velocity.jpg.

Budapest University of Technology and Economics, Hungary

BME Combustion Research Group https://crg.energia.bme.hu/software/