高压涡轮主动间隙控制(high-pressure turbine with active clearance control,HPTACC)引气风斗流动特性将对发动机的效率和安全运转产生较大影响,为此开展HPTACC引气风斗流动特性实验。在出口背压一定状态下,通过改变马赫数和节流孔板...高压涡轮主动间隙控制(high-pressure turbine with active clearance control,HPTACC)引气风斗流动特性将对发动机的效率和安全运转产生较大影响,为此开展HPTACC引气风斗流动特性实验。在出口背压一定状态下,通过改变马赫数和节流孔板直径,获得引气风斗的总压恢复系数等特性规律。实验结果表明:在来流马赫数较低的工况下,引气风斗的总压恢复系数约0.99,流动损失较小。随着马赫数和引气风斗流量的增大总压恢复系数下降,KD3在0.46马赫数时相较于0.19马赫数总压恢复系数下降了11%,0.46马赫数时KD3相较于KD1的总压恢复系数下降了6.5%。引气风斗在马赫数较小时出口总压沿径向分布较均匀;马赫数增加后不均匀度加大。展开更多
Residual stress plays an important part in fabricating commercial aero engine Inconel 718 components for their fatigue properties, reliability and durability. Due to the limitation of Chinese neutron diffraction instr...Residual stress plays an important part in fabricating commercial aero engine Inconel 718 components for their fatigue properties, reliability and durability. Due to the limitation of Chinese neutron diffraction instrument and lack of test practice and specifications, there is little systematic research on the residual stress of forged compressor disc. X-ray diffraction and neutron diffraction methods were used to measure the residual stress of Inconel 718 forged discs at the surface and in the interior, respectively. Scanning electron microscope and transmission electron microscope were used to characterize the microstructural features. The residual stress state at the disc is in near-surface compression, balanced by tension within the disc core. However, the surface residual stress of disc depends more on the rough machining than on the forging process. Also, the dislocation densities increase with decreasing distance to the surfaces of disc, and the residual stress accelerates dislocation generation and dynamic recrystallization.展开更多
文摘高压涡轮主动间隙控制(high-pressure turbine with active clearance control,HPTACC)引气风斗流动特性将对发动机的效率和安全运转产生较大影响,为此开展HPTACC引气风斗流动特性实验。在出口背压一定状态下,通过改变马赫数和节流孔板直径,获得引气风斗的总压恢复系数等特性规律。实验结果表明:在来流马赫数较低的工况下,引气风斗的总压恢复系数约0.99,流动损失较小。随着马赫数和引气风斗流量的增大总压恢复系数下降,KD3在0.46马赫数时相较于0.19马赫数总压恢复系数下降了11%,0.46马赫数时KD3相较于KD1的总压恢复系数下降了6.5%。引气风斗在马赫数较小时出口总压沿径向分布较均匀;马赫数增加后不均匀度加大。
基金Project supported by Commercial Aircraft Engine Co.,Aero Engine Corporation of ChinaProject(2014CB046701) supported by the National Basic Research Program of China
文摘Residual stress plays an important part in fabricating commercial aero engine Inconel 718 components for their fatigue properties, reliability and durability. Due to the limitation of Chinese neutron diffraction instrument and lack of test practice and specifications, there is little systematic research on the residual stress of forged compressor disc. X-ray diffraction and neutron diffraction methods were used to measure the residual stress of Inconel 718 forged discs at the surface and in the interior, respectively. Scanning electron microscope and transmission electron microscope were used to characterize the microstructural features. The residual stress state at the disc is in near-surface compression, balanced by tension within the disc core. However, the surface residual stress of disc depends more on the rough machining than on the forging process. Also, the dislocation densities increase with decreasing distance to the surfaces of disc, and the residual stress accelerates dislocation generation and dynamic recrystallization.
