Abstract: Addressing the faults on the hull wall of a combustor, such as deformation, crack, wrinkle and local over-heat under high-temperature gas, three-dimensional numerical simulations of flow and heat-transfer characteristics of the combustor are conducted via the standard k-ε model with standard wall function and DO radiation model. Results show that heat transfer performance of the half-ball bottom worsens because the reduction of the flow area in the combustor nozzles makes the velocity of gas flow sharply increase, and temperature is higher at some parts of the bottom. The highest temperature of cooling water in the cooling passage is lower than the saturation temperature corresponding to the cooling water pressure, the water-side pressure drop of the combustor depends primarily on the shape of the spiral passage, and the total pressure drop in the cooling passage is smaller than the allowable maximum value.