Abstract
Unsteady velocity measurements made near the spark-plug location of a fired Briggs and Stratton IC engine using a single-component LDV fiber-optic spark-plug LDV probe are reported. An off-the shelf engine was first equipped with an IMPCO carburetor adapter to allow the engine run using methane gas. Velocity data obtained during the engine start and the engine run were analyzed using high-pass filtering, wavelet decomposition, proper orthogonal decomposition, and wavelet decomposition together with proper orthogonal decomposition techniques to separate the mean and fluctuating velocity components. Data was further analyzed to determine the standard deviation of the fluctuating velocity signal and the cross correlation between the pressure and velocity signals. Results show that mean velocity delayed by 0.034 seconds show a high correlation with the pressure signal.
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