Data pertaining to the burning rate of an isolated liquid fuel droplet in a turbulent flow field is scarce.In the present study,an investigation of the effect of free stream turbulence on the burning characteristics of an isolated suspended liquid fuel droplet is reported.For this purpose,free stream turbulence has been generated using grids kept in flush with a round nozzle in a low speed vertical wind tunnel.The entire flow field has been characterized using a bi-component constant temperature hot wire anemometer.The higher order moments of velocities and various scales have been estimated from the instantaneous velocity data measured at different axial locations to the extent of 16D,where D is the exit diameter of the nozzle.A thin quartz fiber is used to suspend the liquid fuel droplet at desired locations,where the mean and fluctuating components and various scales of turbulence are well established.Experiments are conducted at atmospheric conditions under normal gravity.The experimental results for an alcoholic fuel,methanol,and a hydrocarbon oil,n-heptane have been presented systematically.The burning rate is quantified based on the droplet surface regression obtained through simple backlight technique.The flame structure is investigated through direct photographs obtained with a high-definition digital camera.This study assists in the determination of the validity of well-known d2-law during the burning of a liquid fuel droplet in a controlled turbulent ambience.The mass burning rate shows an increasing trend with increasing turbulent intensity and then decreases.The flame height to width ratio remains almost constant except at high turbulent intensity.