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Internal Combustion Engines Fundamentals Episode 2 part 3

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Tham khảo tài liệu 'internal combustion engines fundamentals episode 2 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 530 INTERNAL COMBUSTION ENGINE FUNDAMENTALS Time ms FIGURE 10-26 Spray tip penetration as function of time at various ambient pressures p and injection pressures p0 Fuel jets injected into quiescent air at room temperature.29 seconds s and d in meters Ap in pascals Pg in kilograms per cubic meter and 7g in kelvins. More detailed studies have examined the spray tip location as a function of time following start of a diesel injection process in high-pressure bombs. Data taken by Hiroyasu et al. 29 shown in Fig. 10-26 illustrate the sensitivity of the spray tip position as a function of time to ambient gas state and injection pressure for fuel jets injected into quiescent air at room temperature. These data show that the initial spray tip penetration increases linearly with time t i.e the spray tip velocity is constant and following jet breakup then increase as y t. Injection pressure has a more significant effect on the initial motion before breakup ambient gas density has its major impact on the motion after breakup. Hiroyasu et al. correlated theữ data for spray tip penetration S m versus time as t thread t t break-where i 2Ap 1 2 s 0.39 t Pl An 4 s 2.95 d t 1 2 pj 10.25 t 10.26 - P Ap 1 2 and Ap is the pressure drop across the nozzle pascals Pl and pg are the liquid and gas densities respectively in kilograms per cubic meter d is the nozzle COMBUSTION IN COMPRESSION-IGNITION ENGINES 531 FIGURE 10-27 a Measured outer boundary of sprays injected into swirling air flow ft Spray tip penetration as a function of time for different swirl rates. Solid lines show Eq. 10.27 9 diameter meters and t is time seconds . The results of Reitz and Bracco25 indicate that the breakup or intact length depends on nozzle geometry details in addition to the diameter see Fig. 10-255 . Note that under high injection pressures and nozzle geometries with short length diameter ratios the intact or breakup length becomes very short breakup can occur at the nozzle exit plane. The effect of .

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