Application of Discrete Wavelet Transform in Combustion Chamber LDV Turbulent Measurements

Abstract

In this study, we first considered the influence of the measurement noise in LDV measurements, and tried to remove the noise using discrete wavelet transform (DWT). Then turbulent velocity in the combustion chamber measured by LDV was analyzed. The major results can be summary as follows : 1) The influence of the noise in the turbulent velocity becomes large as frequency increases. Therefore, a setup of cutoff frequency is difficult when removing the noise with a lowpass filter. 2) In this case, it is effective to remove the noise using DWT.