| Citation: | Zhang Hui, Lei Wutao. Calculation method of loading of complex aerodynamic profile nozzle based on NLI factor[J]. Journal of Aerospace Power, 2026, 41（10）：20250146 doi: 10.13224/j.cnki.jasp.20250146
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In order to quickly obtain a large number of load data of complex aerodynamic profile nozzle in flight envelope to meet the needs of fatigue life assessment, the load calculation theory of complex aerodynamic profile nozzle was developed by introducing the factor of complex aerodynamic profile nozzle load influence (NLI), and the calculation method of nozzle load based on the influence factor of complex aerodynamic profile nozzle load was proposed. Based on the computational fluid dynamics (CFD) and numerical calculation method, the basic characteristics of the load distribution of the nozzle with complex aerodynamic profile were obtained, and the load influence factors of the complex aerodynamic profile nozzle were also acquired. The nozzle load theoretical formula derived from the one-dimensional isentropic internal flow theory was used to calculate the variation of the nozzle load caused by the flight height, flight Mach number and engine state. The results showed that the wall load distribution was complicated due to the variation of the flow area and the superposition of the local profile characteristics, but there was a linear or approximately linear relationship between the load at the given position of the nozzle and the nozzle pressure ratio. The calculation method of nozzle load based on the nozzle load influence factor can obtain the nozzle load data under different height, Mach number and engine conditions. The calculation accuracy can inherit the load calculation precision of CFD, and the calculation efficiency was greatly improved with the increase of the load state to be calculated.
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