Experimental study of the ultrasonic muffler efficiency for improving the exhaust gas cleaning system of internal combustion engines of automobiles

Abstract

. In this paper, an extensive study has been carried out on the use of ultrasound for the purpose of cleaning automotive exhaust gases. The main focus is on the use of ultrasonic emitter in automotive muffler design. The paper presents a detailed analysis of the theories associated with the ultrasonic coagulation process and an in-depth description of the physical aspects of the ultrasonic muffler. Methods for evaluating gas cleaning efficiency are also discussed and the importance of using energy consumption as a criterion for evaluating the efficiency of an ultrasonic silencer is emphasised. The paper presents a computational methodology for evaluating the efficiency of a new muffler design based on consideration of the power consumed by the engine to pass gases through the muffler. For experimental verification of the ultrasonic silencer efficiency, a special bench was created to measure the smokiness of gases at changing engine speeds. Experimental results confirmed the effectiveness of the ultrasonic silencer, showing a reduction in the smokiness of gases at a certain combination of speed and frequency of ultrasonic waves, which led to the best cleaning of exhaust gases.