Experiments on an axisymmetric dual-bell nozzle were performed at EDITH nozzle test facility of CNRS in Orléans, France. The main purpose of the study was to explore the possibility of controlling the flow regime transition by a secondary fluidic injection in the dual bell nozzle. The main focus of the present paper is to investigate the impact of the secondary injection parameters on the flow regimes transition in such nozzles. Secondary injection has been found to effectively control the flow regime transition and consequently to increase the propulsive performance of the device. It has also been pointed out that even a very low injected secondary mass flow rate leads to the control of the transition and contributes to reducing the lateral loads which can exist, moreover, when transitions are operated without injection.

在法国奥尔良的CNRS的EDITH喷嘴测试设施上进行了轴对称双钟形喷嘴的实验。该研究的主要目的是探索通过在双钟形喷嘴中进行二次流体注入来控制流态转变的可能性。本文的主要重点是研究二次喷射参数对此类喷嘴中流态转变的影响。已经发现二次喷射可以有效地控制流动状态的转变，从而提高装置的推进性能。还已经指出，即使非常低的注入二次质量流量也导致过渡的控制，并且有助于减小横向负荷，此外，当过渡在没有注入的情况下运行时，该横向负荷可能存在。