GDI Spray Calibration under Different Injection Conditions
QIN Zhengxiao, XU Min, YIN Peng
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School of Mechanical Engineering, Shanghai Jiao Tong University, National Engineering Laboratory for AutomotiveElectronnic Control Technology
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Published
2017-04-25
Issue Date
2017-05-20
Abstract
Simulating the incylinder spray correctly is the key step to improve the incylinder simulation. It is usually necessary to calibrate simulated spray according to measured spray penetration and droplet size in order to achieve the uniformity between the simulated spray and the test spray. The spray simulation under different
conditions of injection pressure, ambient pressure and fuel temperature was carried out with the numerical model of constant volume bomb and spray
established by AVL FIRE software. The simulated spray was calibrated according to the penetration of test spray and the SMD at the plane of 30 mm below the
nozzle and the calibration parameters of different injection conditions were discussed. The results show that spray simulation parameters need to be
adjusted under various conditions. The simulation results of KHRT and HuhGosman breakup model are in good agreement with the experimental values when their respective injection pressure is 10 MPa and 5 MPa. Besides, the calibration parameters are little influenced by fuel temperature.
