The effect of ambient condition on the atomization characteristics were numerically simulated by using centrifugal nozzle as the research object, the influence of ambient air pressure and temperature on atomization characteristics parameters such as oil film thickness and atomization angle were obtained.With the FLUENT used,when the injection pressure was 4.0 MPa, the fuel temperature is 100 ℃,the ambient temperature from －50 ℃ to 400 ℃and the ambient pressure in the range of 0.1～3.0 MPa were numerically simulated.The results show that when the ambient pressure is constant, the temperature increases, the air density decreases, the fuel evaporation intensifies, the gas phase fuel ratio increases, and the atomization effect increases. When the ambient temperature is constant, the environmental pressure increases, the air density increases, the crushing occurs earlier, the oil film thickness increases, and the liquid phase fuel ratio increases, although the spray cone angle and the interaction between oil and gas increase, but it is not conducive to fuel atomization.

Aiming at the shortcomings of the conventional vision measurement method in the dynamic measurement of membrane structures, the target affects the local deformation of the film. The 3D dynamic measurement technology of membrane dot matrix projection is proposed. This technology uses a laser to project the target onto the membrane structure. Based on the OpenCV library（Open Source Computer Vision Library）, the 3D measurement algorithm is proposed to measure the 3D dynamic deformation of the membrane structure. In order to verify the 3D measurement accuracy, a standard ruler for accuracy inspection is designed. The 3D measurement accuracy of the membrane structure dot matrix projection measurement technology is tested in the principle verification experiment. The overall deformation and wave deformation of membrane structure are measured by 24 Hz frame rate photography and offline data processing. Accuracy verification experiments show that the technique can achieve the absolute accuracy of less than 0.30 mm and an accuracy of about 0.77 mm in the X, Y and Z directions, respectively, at the measurement distance of 1 m and the field of view of 1.3 m×0.8 m. At the same time, the dynamic measurement results can effectively replicate the dynamic deformation process of the membrane structure.