Abstract: In this research, the experimental study results of designed front device with liquid fuels pneumatic atomization in relation to the, low emission combustion chamber are presents. The preparing method of uniform liquid fuel-air mixture in the front device with fine-dispersed spray in swirl flow conditions is observed. Autonomous tests of the front device have been developed and conducted. The basic characteristics of fine-dispersed fuel-air spray in the open space were examined by means of non-contact laser diagnostics method. According to the results of cold tests the average zauter diameter of the fuel droplets in the idle mode is about 23 μ. The wide and intense backflow zone is formed near the device axis. To test the device developed and the method of fuel-air mixture preparation fire tests in the model 3-Burner compartment under high pressure environment have been conducted. The ignition and blowout points under earth conditions have been obtained as the result of tests conducted. The efficiency of lean fuel-air mixture combustion technology has been confirmed.