In order to study the spray form and development law of the air-assisted direct injection (AADI) injector of small aircraft engines

numerical simulation and high-speed photography technology were used to study the dynamic spray field. The physics model of cone valve motion was defined as the moving boundary conditions of numerical calculation. The spray velocity distribution

static and dynamic pressure distribution and spatial distribution atomization particles at different times of AADI injector were analyzed by dynamic grid. The spray pattern

atomization and penetration were compared by experiments and simulations in 3ms every 0.2ms. Results show that CFD simulation technology was used to analyze velocity distribution

pressure distribution

spray pattern and other parameters of the dynamic spray field of AADI injector

helping to reveal the development rule of the spray; moreover

through quantitative comparison analysis of the particle sizes and penetration distance

the accuracy of simulation calculation was shown. The deviation of numerical simulation and experimental results is less than 5%

meeting the requirements of engineering applications.