A high pressure particle generator based on cyclone separation principle was designed

and applied for PIV（particle image velocimetry） measurement of inner flowfield of high pressure aero turbine engine combustor successfully. With the combustion flow of hydrogen and oxygen

the research of measurement for complicated inner flowfield in the single sector combustor of aero turbine engine was carried out by PIV at 813K and 2.78MPa. The strong rotational and turbulent inner flowfield with wide velocity range was measured under conditions of high temperature and pressure

and the flowfield velocity and microscopic structure close to real work pressure of combustor were obtained. The results show that there are multiple vortices in the inner flowfield of the studied combustor

accompanied with relevant recirculation zones. The effect of swirler is strong

and there is big vortex clockwise in cross section. The jet effect of main combustion holes and dilution holes is obvious

the jet flows have deep penetration

and have distinct effect on the flowfield structure. The flow field structure under high temperature and pressure condition is similar to that under normal temperature and moderate pressure.