基于多流路体积力模型的翼身融合布局飞机计算方法

针对翼身融合布局(BWB)飞机分布式系统一体化研究方法存在计算资源耗费巨大的问题,发展基于多流路体积力的飞机分布式系统一体化计算方法。从沿流线的体积力模型出发,将压气机对气流的作用力用沿流线的源项场代替。将单流路的计算模型加以扩展,综合考虑分布式推进系统与BWB的耦合影响,在分布式推进系统的压缩系统所在区域添加体积力源项,建立多流路体积力计算模型。将其应用于某大型BWB飞机进行一体化数值仿真。结果显示:相较于传统的全周定常数值模拟方法,采用多流路的体积力模型能够在保证一定计算精度的条件下提高至少10倍的计算效率。

Blended wing body simulation method for aircraft based on body force model with multiple flow paths

In view of the simulation method for blended wing body (BWB) aircraft integration with distributed propulsion system that has the problem of costly computing resources, a simulation method for BWB aircraft based on streamwise body force model with multiple flow paths was presented. Through replacing the force of blade on the airflow by the source term, the streamwise body force model was established. Considering the coupling between the distributed propulsion system and BWB aircraft, each compressor system area was replaced by the body force source term. Thus, the multi-flow path streamwise body force model was proposed. It was applied to the numerical simulation for a large-scale BWB aircraft with distributed propulsion system, and the result showed that compared with the traditional full cycle numerical simulation, the multi-flow path streamwise body force method could greatly save computing resource and improve calculation efficiency by more than 10 times under the condition of acceptable simulation accuracy.