The Effect of Fuel-Line Pressure Perturbation on the Spray Atomization Characteristics of Automotive Port Fuel Injectors 952486
An experimental study was carried out to characterize the spray atomization process of automotive port fuel injectors retrofitted to a novel pressure modulation piezoelectric driver, which generates a pressure perturbation inside the fuel line. Unlike many other piezoelectric atomizers, this unit does not drive the nozzle directly. It has a small size and can be installed easily between regular port injector and fuel lines. There is no extra control difficulty with this system since the fuel injection rate and injection timing are controlled by the original fuel-metering valve. The global spray structures were characterized using the planar laser Mie scattering (PLMS) technique and the spray atomization processes were quantified using phase Doppler anemometry (PDA) technique. Four standard gasoline port injectors including central port injection (CPI), electrostatic-discharge-machined (EDM) director-plate, compound silicon-micro-mach-ined (SMM) and dual-stream (DS) injectors were tested in this study. The experimental results showed that this pressure modulation technique can greatly enhance the spray atomization process of the gasoline port injectors. The spray behavior showed a strong dependence on the driving frequency and power of the pressure modulator. The optimal operating conditions for the pressure modulation device, however, depend on the injector design.
Citation: Zhao, F., Amer, A., Lai, M., and Dressler, J., "The Effect of Fuel-Line Pressure Perturbation on the Spray Atomization Characteristics of Automotive Port Fuel Injectors," SAE Technical Paper 952486, 1995, https://doi.org/10.4271/952486. Download Citation
Fu-Quan Zhao, Amer Ahmad Amer, Ming-Chia Lai, John L. Dressler
Wayne State Univ.
1995 SAE International Fall Fuels and Lubricants Meeting and Exhibition
SAE 1995 Transactions: Journal of Fuels and Lubricants-V104-4