. . . "J\u00EDcha, Miroslav" . "RIV/00216305:26210/13:PU106933" . "This study documents several ways to reduce drop size in spray of a spill-return type pressure-swirl atomizer (PSA) for a waste oil burner. In the first part, liquid breakup and spray microstructure of PSAs was documented using spray photography and Phase-Doppler Anemometry (PDA) on a cold test bench at different loads. Then factors that affect the spray characteristics, such as: (1) nozzle design and dimensions, (2) operational conditions and (3) physical properties of atomized liquid, were analysed based on a literature survey. According the analysis, several geometrical factors were chosen for design of six nozzles with modified geometry that were probed using PDA. The literature data analysis shows that a modification of rheological properties of fuel used, namely its heating-up, would significantly reduce D32 mainly due to a viscosity change. Our tests show that doubling the inlet pressure with additional reduction of exit orifice size to keep flow rate would drop D32 by 28 \u2013 33%. The simplest"@en . "Design optimization, Pressure-Swirl Atomizer, Burner Retrofit"@en . "This study documents several ways to reduce drop size in spray of a spill-return type pressure-swirl atomizer (PSA) for a waste oil burner. In the first part, liquid breakup and spray microstructure of PSAs was documented using spray photography and Phase-Doppler Anemometry (PDA) on a cold test bench at different loads. Then factors that affect the spray characteristics, such as: (1) nozzle design and dimensions, (2) operational conditions and (3) physical properties of atomized liquid, were analysed based on a literature survey. According the analysis, several geometrical factors were chosen for design of six nozzles with modified geometry that were probed using PDA. The literature data analysis shows that a modification of rheological properties of fuel used, namely its heating-up, would significantly reduce D32 mainly due to a viscosity change. Our tests show that doubling the inlet pressure with additional reduction of exit orifice size to keep flow rate would drop D32 by 28 \u2013 33%. The simplest" . "2"^^ . . . . "RIV/00216305:26210/13:PU106933!RIV14-GA0-26210___" . . "2"^^ . "P(ED0002/01/01), P(GAP101/11/1264)" . . . . . . . . "Jedelsk\u00FD, Jan" . "94484" . "[599B7BF032B9]" . . "26210" . . . "Optimization of Pressure-Swirl Atomizer for a Burner Retrofit"@en . "Optimization of Pressure-Swirl Atomizer for a Burner Retrofit" . "Optimization of Pressure-Swirl Atomizer for a Burner Retrofit"@en . "Optimization of Pressure-Swirl Atomizer for a Burner Retrofit" . .