A numerical method is utilized to investigate effects of jet angle and number of jet nozzles on the aerodynamic and heat transfer behaviors of swirl cooling. Cooling air is injected into the swirl chamber through various jet nozzles, and then flows out from the swirl chamber outlet. The distribution of jet nozzles along the axial direction is kept uniform when the number of jet nozzles is changed. Results show that when the cooling air jets into the swirl chamber from jet nozzles, it scours the wall and mixes with the axial mainstream, then a significant high heat transfer region is generated. The heat transfer intensity gradually decays along the axial and the circumferential directions, and the high heat transfer region shows deflection towards outlet at the downstream. When the jet angle turns away from 90°, the cooling air rotation movement is weakened, leading to a decrease of heat transfer intensity. When the number of jet nozzles increases, the air jet velocity reduces, and the thermal intensity in the high heat transfer region decreases. Moreover, the circumferential air velocity and the distribution of heat transfer intensity in target wall become more uniform. The global average Nusselt number increases at first and then reduces as the jet angle and the number of jet nozzles increase, and reaches the highest value when the jet angle arrives 90° and the number of jet nozzles is 9. The total pressure loss ratio increases as the jet angle and the number of jet nozzles increase. A comparison with the traditional simple pipe swirl cooling model shows that the present blade leading edge swirl chamber structure with 90° jet angle and 9 jet nozzles has more remarkable heat transfer property.