A study on liquid film and evaporation characteristics of fuel jet impingement on the scorching wall of evaporation tube for gas turbine.

This article focuses on the numerical simulation of fuel jet impingement and liquid film formation inside the evaporation tube of a gas turbine, examining how inlet air Reynolds number, fuel mass flow rate, and fuel injection angle affect evaporation characteristics, flow field structure, and film development. The study identifies a valley-shaped low-speed zone called the retarding effect behind the fuel jet, which influences film separation and surface velocity; higher inlet air Reynolds numbers delay film separation and increase surface velocity, while fuel mass flow rate mainly affects film thickness and separation propensity. An optimal inlet air Reynolds number of 49,000 and injection angle of 30° maximize evaporation rates at 90.83% and 83.01%, respectively, whereas increasing fuel mass flow rate reduces evaporation efficiency. A semiempirical evaporation model incorporating Reynolds number, air-fuel ratio (AFR), and injection angle is proposed to predict evaporation rates under specified temperature conditions.