Design Method for Streamwise Area Distribution of Variable Cross-Section Curved Isolator

The isolator, as a critical component in the rocket based combined cycle engine for matching the intake and combustion processes, plays a vital role in ensuring the efficient operation of the engine across a wide speed range. However, designing a curved variable-cross-section isolator with superior aerodynamic performance remains a significant challenge. This paper proposes a refined design method for the distribution of the streamwise cross-sectional area. For different isolator contours, the impact of this design method on the total pressure recovery capability and anti-backpressure capability is discussed. The results indicate that the refined design of the streamwise cross-sectional area can improve the total pressure recovery coefficient at the isolator outlet to some extent, while the anti-backpressure performance of the isolator can be enhanced by approximately 14.5%. The findings of this study can provide valuable insights for the wide speed range design of isolators.