High Speed Photography and Pulsed Laser Holography for Diagnostic Investigations of Mixture Formation and Vibration in Reciprocating Engines

摘要

Using high speed photography, injection and mixture formation processes were recorded and the ignition delay time was determined at full load of a reference diesel engine at 2500 rpm. Pressure was measured by a quartz pressure transducer. Pressure increase was compared with ignition delay. Using holographic interferometry, the injection jet interaction with its environment in the atmosphere was shown. In order to identify the optimum points for fixing antiknocking sensors, holographic interferometry is recommended, because of its high local resolution. For localizing noise sources, holographic recording and evaluation of the vibration modes of complete engine transmission systems under sinusoidal and operational excitation is useful.