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为了使进气道尽可能短而又使附面层放气量少,必须挖掘附面层本身的潜力.运用Stratford紊流附面层分离准则,找到一种特殊型面,令附面层沿型面尽可能多地保持在一种即将分离而尚未分离状态,即所谓“连续零壁面摩擦流动”.只须少量放气,即可避免分离.模型的半自由射流风洞试验结果,与有限差分数值计算结果比较接近.只须放去<1%进气道流量,即可使亚音段长度缩短50%,而无分离产生.由于长度大大缩短,并放出一部份低能流,可减弱冲波与附面层干扰,改善总压恢复和出口流场,减轻结构重量,改善刚度,并为燃烧室发展提供更多空间.
In order to make the inlet as short as possible and to make the stratum deflate less, the potential of the stratum itself must be tapped.Using Stratford turbulence splitting criteria to find a special profile, Surface as much as possible to maintain a state of separation but not yet separated, the so-called “continuous zero-wall friction flow.” Only a small amount of deflated to avoid separation.Model semi-free jet wind tunnel test results, and finite difference Numerical results are quite close. Just put away <1% of the inlet flow, you can shorten the length of sub-Aicheng 50%, without separation produced due to greatly shorten the length and release part of the low-energy flow, weakened red Wave and surface interference, improve the total pressure recovery and exit flow field, reduce the weight of the structure, improve the stiffness, and provide more room for the development of the combustion chamber.