Numerical study on dynamic operating characteristics of permeable nozzle

DOI:	10.11809/bqzbgcxb2024.08.022
Keywords:	altitude compensated nozzle; permeable nozzle; flow separation; dynamic; numerical simulation
Abstract:	Permeable nozzle is a new type of altitude compensation nozzle, which can achieve adaptive altitude compensation, which has important research significance in the field of single stage orbit technology. In this paper, the method of establishing a transient model is used to numerically simulate the permeable nozzle in a certain pressure ratio range, and the generation and evolution law of the internal wave system structure of the permeable nozzle are clarified through dynamic analysis, and the relevant thrust performance analysis is carried out. The results show that when the NPR reaches 72.7, there is unattached shock US in the nozzle. When the NPR is low, the mechanism of US is pneumatic; When the NPR is high, the generation mechanism of US is affected by the shape of the nozzle wall in addition to the pneumatic mechanism. When the starting point of the US shock wave is inside the permeable nozzle, the nozzle shows a thrust compensation state, and vice versa. When the NPR is less than 372.69, the thrust performance of the permeable nozzle is better than that of the traditional nozzle. The best working condition for permeable nozzle thrust compensation is when NPR is equal to 70, and the thrust coefficient can be increased by more than 24% under this working condition.
Issue:	Vol. 45 No. 8 (2024)
Published:	2024-09-02
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