塞式喷管性能损失分析

影响塞式喷管性能的因素是多方面的,为了明确各种损失对其的影响程度,根据塞式喷管的工作特点,通过建立的塞锥壁面压力分布的简化模型,初步分析了这些因素,比如摩擦损失、化学非平衡损失、截短损失和底部损失等.结果表明,由于塞锥长度的截短所引起的截短损失和底部损失是影响塞式喷管性能的主要因素.为了减小由此所带来的性能损失,应通过实验和数值模拟的方法着重研究气流在塞锥上和底部的流动特征,并且在设计的过程中应该考虑这些因素,以降低其对性能的影响.

Performance loss analysis on aerospike nozzles

The performance of the aerospike nozzles is influenced by many factors. To identify how much influence each factor work on the performance loss, the major factors were analyzed, including the boundary layer losses, the chemical kinetic losses, the truncated losses and the base losses, as well as the losses inherent to the design. The model of the pressure distribution on plug wall was established according to the altitude compensation capability of the plug nozzle. The results show that the truncated losses and the base losses due to the truncation of the plug are the main factors influencing the performance of the aerospike nozzle. To reduce the losses and improve the performance , the gas flow features on the spike and base should be emphatically investigated by the experiments and the numerical simulations, and these features should be taken into account in the process of the aerospike nozzle design.