<p>The spray and flow structures generated from the injectors of the lean premixed prevaporized (LPP) combustor are essential to the research and development of modern aero-engines. In this work, we develop an optical model combustor featuring five linearly arranged LPP injectors and a laser diagnostics system based on high-repetition-rate and high-energy pulse lasers to study the spray and flow field characteristics. The effects of varying fuel and airflow rates on the spray cone area and droplet spatial distribution as well as on the mean flow structures and dynamics are experimentally investigated using high-speed particle image velocimetry (PIV), planar laser-induced fluorescence (PLIF), and planar MIE scattering (PMIE). The results demonstrate that the impingement of adjacent sprays is crucial to the formation of the outer recirculation zones (ORZ) among injectors. The fuel-to-air ratio (FAR) has an overall significant effect in controlling the flow and spray characteristics. The combined analysis of the velocity fluctuations and spray reveals that, with increasing FAR, the turbulent intensity diminishes in the shear layer, contributing to an inhibition of the liquid fuel breakup and eventually a deteriorated atomization performance characterized by the denser distribution of large-size droplets in the central recirculation zone.</p>