超声速湍流导管烧蚀流场稳定性研究

对超声速湍流导管烧蚀流场进行理论计算,选取了初始面积比为2.0和3.0的超声速导管,得到了在绝热指数为1.1、1.2和1.3三个典型状态下总焓、马赫数、导管内压力、静焓及恢复焓随导管截面积加大的计算结果。研究表明:试验过程中总焓不变,但由于试验材料烧蚀导致导管的截面积加大将引起其余流场参数的变化,马赫数随导管的截面积加大而加大,其余参数随导管的截面积加大而降低,在导管截面积增大20%时,马赫数增幅在9%以内,导管内压力降幅在20%以上,静焓降幅在8%以内,恢复焓降幅在1%以内,绝热指数的上升将引起导管参数增幅或降幅加大,初始面积比加大,将引起导管参数增幅或降幅减小。

Stability of Ablative Flow Field of Supersonic Turbulent Duct

The calculation was carried out on flow field of supersonic turbulent duct. Two supersonic turbulent
ducts with initial area ratios 2. 0 and 3. 0 were calculated at three specific heat ratios:1. 1, 1. 2 and 1. 3. The results included the changes of total enthalpy, Mach number, pressure in duct, static enthalpy and recovery enthalpy with in crease of the cross area of duct. It shows the total enthalpy is constant in tests, but other parameters change with the increase of cross area of duct due to test materials ablation. Mach number increases with the increase of cross area,the other parameters decrease. When cross area of duct increases by 20%, Mach number increasing amplitude is less than 9%, the pressure decreasing amplitude in duct exceeds 20%, the decreasing amplitudes of static enthalpy and recovery enthalpy are within 8% and 1%. The increasing or decreasing amplitudes of parameters in duct are higher with specific heat ratio increasing and lower with initial area ratio increasing.