The dual-throat Ludwieg tube tunnel can effectively eliminate disturbances caused by the opening process of the fast-acting valve, but it will significantly reduce the effective running time of wind tunnel. Additionally, due to the limi-tations of the material of the fast-acting valve, it is difficult to further increase the heating temperature of the storage section of the Ludwieg tube tunnel. To solve this problem, this paper proposes a novel design for the dual-throat Ludwieg tube wind tunnel by placing the annular heater in the settling chamber to achieve an integrated design of flow uniformity and heating. Firstly, the unsteady numerical simulation is used to verify the feasibility of the dual-throat Ludwieg wind tunnel with new layout. Then, the start-up characteristics was analyzed, and the variation of Mach number and pressure at different stations during the running is quantitatively studied. Finally, the effect of the heater on the running process of the tunnel is explored. The results show that the effective running time of dual-throat Ludwieg tube tunnel with a heater in the settling chamber up to 80 ms, which can be increased by 23% com-pared to the traditional dual-throat layout. Additionally, when the heater temperature is increased from 434K to 1234K, the maximum deviation of Mach number in the core region at the exit of the second nozzle can be de-creased by 0.21%, the root mean square deviation can be decreased by 0.005, and the temperature can be in-creased by nearly 40K, the testing capability of the wind tunnel effectively enhanced.
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