Oleksiy V. Penkov

Exhaust Cleaning with Dielectric Barrier Discharge

To clean the exhaust emissions as one of the most important tasks in pollution control, a study on the treatment of engine emissions with discharge assistance was reported. A DBD plasma source shaped in grid and cylinder was examined in different engine operational modes to reduce the NOx content of diesel engine exhaust. The composition of the exhaust gases and chemical reactions initiated by the discharge were analyzed. The discharge frequency had a crucial impact on the devices performance and gas treatment. The voltages applied to the discharge gap could alter the chemical reactions occurring in the treated gases, which were indicated by the NO to NO2 ratio. The operation of the system was studied at frequencies ranging from 400 Hz to 16 kHz.

Effect of ion beam irradiation on the structure of ZnO films deposited by a dc arc plasmatron.

The deposition of polycrystalline ZnO film on a cold substrate was performed by using a plasmatron in rough vacuum condition. Low energy oxygen ion beam generated by a cold cathode ion source was introduced during the deposition process. The change of film property on the ion beam energy was checked. It is shown that irradiation by 200 eV ions improves crystalline structure of the film. Increasing of ion beam energy up to 400 eV leads to the degradation of a crystalline structure and decreases the deposition rate.

Application of greed type DBD in diesel engine exhausts cleaning

Summary form only given. The regulations of diesel exhaust emissions become stricter, so investigations of catalytic and plasma assisted exhaust treatment become more intensive. The present work continues our investigations on engine emissions treatment with discharges assistance. We designed variations of greed shaped dielectric barrier discharge (DBD) plasma sources in order to reduce the NOx content of a diesel engine exhaust, testing it on the different engine operation modes. An effect of combined work of plasma source and soot filters on particulate matter (PM) was studied. Discharge frequency has a crucial impact on equipment performance and gas treatment. The plasma source supply frequency was varying from 400 Hz to 28.5 kHz. A 95 % decreasing of NO and 70 % reduction of NOx was obtained. It was found that the discharge application increased efficiency of carbon particles removing 1.4 times.