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形成了一套基于CFD计算评价的并列双发三维非对称多S弯喷管参数化设计方法,并初步证明了该方法的正确性和可行性.多S弯中心线在Z向偏心度为0时:第一S弯Y向偏心度、长度都最小,第二S弯Y向偏心度、长度都最大,第三S弯Y向偏心度、长度分别介于前两个S弯对应参数之间,各S弯都采用进口缓慢转弯,出口快速转弯的规律,以利于抑制背风侧分离和涡.剖面在各S弯上都采用进口快速收缩缓慢转弯,出口缓慢收缩快速转弯的规律,且宽高比与侧边倾角在进出口变化速率相同,且侧边倾角只分布在第一S弯上,以利于稳定流场和增加隐身性能.合流器采用楔底宽高比约束,其值应不超过0.26.
A set of parameterized design method of parallel double-helix three-dimensional asymmetric multi-S-bend nozzle based on CFD calculation and evaluation was established and the correctness and feasibility of the method was initially proved.When the eccentricity of multi-S curve is zero The first S-bend Y-direction eccentricity and the smallest length, the second S-bend Y-direction eccentricity and the largest length, and the third S-bend Y-direction eccentricity and the length are respectively between the corresponding parameters of the first two S-bends , Each S bend adopts the rule of slow turning and rapid turning of exit in order to restrain the leeward side separation and vortex.The profile adopts the method that the rapid contraction of the inlet is slow and the curve of the outlet is slowly contracted at each S bend, The rate of change at the entrance and exit is the same as that of the side inclination, and the side inclination is only distributed on the first S-bend to facilitate the stabilization of the flow field and increase the stealth performance.The confluenceor adopts a wedge-bottom aspect ratio constraint and its value should not exceed 0.26.