MU Yuan-wei 1,2 , WANG Feng-ming 1,2 , ZHU Da-ming 1.Simulation of Variable Geometry Characteristics of Single Bypass Variable Cycle Engine[J].航空发动机,2024,50(2):52-57
Simulation of Variable Geometry Characteristics of Single Bypass Variable Cycle Engine
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Key Words:variable cycle engine  variable geometry  single bypass  simulation model  fuel consumption rate
Author NameAffiliation
MU Yuan-wei 1,2 , WANG Feng-ming 1,2 , ZHU Da-ming 1 1. Aero Engine Academy of China 2. Advanced Jet Propulsion Innovation Center:Beijing 101304China 
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Abstract:To investigate the performance gain of the single bypass variable cycle engine, we established a simulation model and veri? fied its computational accuracy through examples. The simulation and generation of the best variable geometry parameters, throttling characteristics, and altitude-velocity characteristics for the three variable geometry schemes are based on the engine control laws and optimal control objectives for different flight states. The study indicates that Scheme 3, which employs a variable geometry scheme with adjustable tail nozzle, mixer, and low-pressure turbine guide, outperforms Scheme 1, the conventional engine variable geometry scheme. Scheme 3 reduces fuel consumption rate by 1.7% to 3.0% in ground throttling state, increases supersonic cruise thrust by 14% to 29%, and reduces fuel consumption rate by 0.9% to 3.1% in subsonic cruise. This represents the largest performance gain among the three variable geometry schemes. Scheme 2, the variable geometry scheme with an adjustable tail nozzle and mixer, can reduce fuel consumption rate by 1.2% to 2.2% in ground throttling state, increase supersonic cruise thrust by 3% to 17%, and reduce subsonic cruise fuel consumption rate by 0.9% to 1.2%. Among the three variable geometry schemes, Scheme 2 exhibits intermediate performance gains.When selecting engine geometry options, it is important to consider the balance between the costs of structural complexity, reliability, and mass, and the overall performance gains based on specific mission requirements.
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