环形混合器混合排气系统气动形面的优化设计

Optimization Design of Aerodynamic Shape of Splitter Mixing Exhaust System

以B样条曲线为基础、采用计算流体力学方法,并结合改进的粒子群优化算法,提出了一套环形混合排气系统喷管型线与环形混合器径向位置的一体化优化设计方法,并采用该方法对某型使用中的环形混合器混合排气系统进行了优化设计.优化结果表明,较之原始模型,优化后的环形混合器混合排气系统在流量分配方面与设计值更为接近,涵道比的误差为2.8%.气动性能方面,设计条件下,优化模型推力为原始模型的1.061倍,总压恢复系数则提升至0.995;在非设计条件下,优化模型的总压恢复系数较原始模型提高了0.7%和0.4%,推力较原始模型提高了1.2%和2.7%.

An integrated optimization design method fo r nozzle configuration and splitter radial location was proposed using B-spline curve, computational f lu id dynamics method and improved particle swarm optimization. Then the proposed method was implemented to optimize a splitter mixing exhaust system. The results indicate that the optimized system has better mass f lu x distribution than the original model. The difference o f bypass ratio between optimized model and design value is 2. 8% . In aerodynamic performance aspect,the thrust o f optimized splitter mixing exhaust system is 1. 061 times as the original model,and the total pressure recovery coefficient increases to 0. 995. Under the off-design conditions,compared with the original model,the total pressure recovery coefficients of optimized model increase respectively by 0. 7 % and 0. 4%,and the thrust increases respectively by 1. 2% and 2. 7 % .