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| Visual Study of Diesel Dual Injection Spray Impingement and Combustion |
| DOI：10.13949/j.cnki.nrjgc.2023.06.004 |
| Key Words:constant volume combustion bomb dual injection two-color method spray impingement combustion characteristic |
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| Abstract:The spray impingement and combustion flame of upper and side injector under separate injection and vertical injection were obtained by using high-speed camera based on schlieren method. The diesel injection pressures were set at 80， 120 and 140 MPa， and the ambient pressure was set at 4 MPa. The ambient temperatures were set at 500 K and 800 K in the research of spray and combustion. The results show that the penetration distance and area of spray increase with the increase of injection pressure both under single and vertical injection states. In the vertical injection state， the spray area is smaller than the sum of the spray area of separate injection states due to the partial energy loss after collision. The two-color method was used to study the combustion characteristics of the fuel under different conditions. The results show that， with the increase of the injection pressure in the stable combustion period of 1.50~3.50 ms， the flame area of each injection condition and the combustion temperature increases， and the soot formation decreases. The flame area under vertical injection state is smaller than the sum of flame area under two separate injection states， and the combustion temperature and soot formation are higher than those under two separate injection states. |
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