Abstract: The effects of swirling airflow and divergence angle, in the airblast atomizer on the atomizing performance were studied.Six different atomizers having three kinds of blade angle -swirlors and three .kinds of exit divergence angle have been, tested, and the results have been analyzed.The conclusions obtained are that. The swirling airflow gives little influence on the atomizing performance, so is the divergence angle. Therf ore they may be designed chiefly according to the need of flow pattern in the combus-tor.