Feedback effects of pesticides flow atomization on the operating characteristics of pulsed engines

Abstract

Traditional pulse-jet fogger have problems such as poor atomization or unstable operation. A pulse-jet fogger test device with an adjustable liquid flow rate was designed. Four experimental settings were used, no spraying and spraying with three liquid flow rates (11 L/h, 14 L/h, and 20 L/h). Pressure waveform in the combustion chamber and smoke inhalation depth tests showed following results: under different chemical fluid flow conditions, influences of the thermal atomization of the chemical liquid were observed in the pulse engine. Feedback effects were mainly changes in parameters and during each pulsation period, the turning time of the airflow in the pulse engine had different effects. The fuel consumption rate and pressure peak-to-peak value under 20 L/h chemical fluid flow were higher than other working conditions, and the positive and negative pressure amplitude fluctuated the least and had the best pressure stability. The 14 L/h chemical liquid flow demonstrated the worst stability, with the most significant fluctuations in pressure amplitude and large cyclical changes and poor consistency of the maximum depth of smoke inhalation in each cycle in the atomization section, with a high maximum relative difference of 34.6%, causing significant turbulence in the airflow oscillation system.