The main interest in the current study focuses on the possibility of overspeeding for the gas-generator cycle air turbo ramjet(GG-ATR)engine.The authors developed the air turbo ramjet engine and investigated its compr...The main interest in the current study focuses on the possibility of overspeeding for the gas-generator cycle air turbo ramjet(GG-ATR)engine.The authors developed the air turbo ramjet engine and investigated its compressor performance.Based on those data,the authors developed the analytical code for the air turbo ramjet engine,which calculates the performances of turbomachinery,gas-generator,and ram combustor.The previous study described that the rotor overspeeding would not occur in the air turbo rocket engine.However,the current results show that degraded ram combustion can decrease the compressor pressure ratio and the compressor power.This reduced compressor power can cause overspeeding for the air turbo ramjet engine.The experimental results of compressor power and turbine inlet pressure support those analytical results.展开更多
Experimental and numerical investigations were performed to reveal the effect of prestress on the fatigue properties of FGH4097 so as to quantitatively evaluate the overspeed benefit of the disc of aeroengine. A corre...Experimental and numerical investigations were performed to reveal the effect of prestress on the fatigue properties of FGH4097 so as to quantitatively evaluate the overspeed benefit of the disc of aeroengine. A corresponding experiment was performed to examine the effect of prestress on the fatigue life of FGH97. A complete model describing the fatigue properties of the prestressed notch specimen was proposed. After the modification of mean stress, stress gradient and prestressing treatment, the model is finally verified by fatigue test of presstressed notch specimens machined from FGH4097 with satisfactory accuracy and good engineering applicability. The new model highlights that for the variable fatigue loads, the introduction of appropriate prestress is expected to benefit to the notch specimens and certainly to the disc of aeroengine regards of their fatigue properties. Both the calculation method of fatigue life parameters and the prestress correction model are proved to have good prediction accuracy.展开更多
文摘The main interest in the current study focuses on the possibility of overspeeding for the gas-generator cycle air turbo ramjet(GG-ATR)engine.The authors developed the air turbo ramjet engine and investigated its compressor performance.Based on those data,the authors developed the analytical code for the air turbo ramjet engine,which calculates the performances of turbomachinery,gas-generator,and ram combustor.The previous study described that the rotor overspeeding would not occur in the air turbo rocket engine.However,the current results show that degraded ram combustion can decrease the compressor pressure ratio and the compressor power.This reduced compressor power can cause overspeeding for the air turbo ramjet engine.The experimental results of compressor power and turbine inlet pressure support those analytical results.
基金supported by the National Science and Technology Major Project, China (No. J2019-IV-0012-0080)the National Natural Science Foundation of China (No. 12202030)the China Postdoctoral Science Foundation (No. 2022M720340)。
文摘Experimental and numerical investigations were performed to reveal the effect of prestress on the fatigue properties of FGH4097 so as to quantitatively evaluate the overspeed benefit of the disc of aeroengine. A corresponding experiment was performed to examine the effect of prestress on the fatigue life of FGH97. A complete model describing the fatigue properties of the prestressed notch specimen was proposed. After the modification of mean stress, stress gradient and prestressing treatment, the model is finally verified by fatigue test of presstressed notch specimens machined from FGH4097 with satisfactory accuracy and good engineering applicability. The new model highlights that for the variable fatigue loads, the introduction of appropriate prestress is expected to benefit to the notch specimens and certainly to the disc of aeroengine regards of their fatigue properties. Both the calculation method of fatigue life parameters and the prestress correction model are proved to have good prediction accuracy.
