AbstractThe continuous trend towards using higher pressure ratio engines combined with the effects of using fuels of high aromatic content and boiling range and less hydrogen content, have Increased the vulnerability of combustor wall to high temperatures.In order to overcome this difficulty and optimize the quantity and distribution of cooling air, prediction of temperature should be as accurate as possible.In this work an empirical model has been developed, which enables predicting liner temperature with 7% deviation for different types of combustors at different loading conditions using fuels of wide range of aromatic content, hydrogen percent and boiling range. This is in comparison with 60%-100percnt; obtained with other models.