Abstract: The measurements of turbulent gas particle two phase flows in two types of side dump combustors have been made.One of the combustors is of blade inlet type,the other is of central tube tangential inlet type.Experimental investigations have been carried out by using a TSI 2 dimensional LDV system.The time averaged and RMS fluctuation velocity of gas and particle phases in axial and tangential directions have been measured.It can be seen that strong recirculating flows of two phases exist in the head zone of both combustors,and swirling flows of two phases exist in the tangential inlet combustor;the time averaged velocity slip between two phases and the fluctuation velocity of two phases are sufficiently high.These flow characteristics can be favorable to ignition,flame stabilization and combustion intensification.