This paper presents the results of free-jet experiments conducted on an internal injection oblique detonation engine in a large-scale hypersonic shock tunnel.To overcome the challenges of non-uniform mixing and the fa...This paper presents the results of free-jet experiments conducted on an internal injection oblique detonation engine in a large-scale hypersonic shock tunnel.To overcome the challenges of non-uniform mixing and the failure of oblique detonation wave initiation when using liquid fuel,a combined strut-wall injection configuration was employed.Initiation was achieved by introducing a bump structure on the wedge.The results demonstrate that this strategy for mixing and initiation effectively establishes the oblique detonation wave combustion flow field.To further investigate the fuel mixing and initiation processes in the oblique detonation engine,three-dimensional numerical simulations consistent with the experimental conditions were carried out using the ReynoldsAveraged Navier-Stokes(RANS)method.The simulation results reveal that the high-speed gas flow generates shock waves as it passes through the central strut and transverse fuel jets.These shock waves are reflected by the wall,forming a series of shocks in the mixing section.The kerosene injected from the strut injectors does not react during the mixing phase.However,due to the influence of the high-temperature boundary layer,the kerosene injected through the wall undergoes precombustion.The separation zone upstream of the bump generates separation shock waves,allowing the multi-wave point to stabilize at a short distance from the leading edge of the wedge.展开更多
为了对自升式钻井平台插拔桩和冲桩过程进行研究,设计了一套自升式钻井平台插拔桩和冲桩试验系统。该系统能够提供最大50 k N的推力和拉力,以及最大压力为1 MPa的冲桩水,满足试验工况的要求;能够监测记录试验过程中的阻力、孔隙水压力...为了对自升式钻井平台插拔桩和冲桩过程进行研究,设计了一套自升式钻井平台插拔桩和冲桩试验系统。该系统能够提供最大50 k N的推力和拉力,以及最大压力为1 MPa的冲桩水,满足试验工况的要求;能够监测记录试验过程中的阻力、孔隙水压力、桩靴模型的位移和试验土体的性质。对试验系统的承力部位加载架进行了有限元分析,结果表明加载架的稳定性符合要求;当入泥深度在300 mm以内时,试验测得的阻力与SNAME(2008)推荐方法预测阻力吻合。所得结果验证了试验系统能够有效地模拟插拔桩及冲桩过程。展开更多
基金National Natural Science Foundation of China(No.52006181)。
文摘This paper presents the results of free-jet experiments conducted on an internal injection oblique detonation engine in a large-scale hypersonic shock tunnel.To overcome the challenges of non-uniform mixing and the failure of oblique detonation wave initiation when using liquid fuel,a combined strut-wall injection configuration was employed.Initiation was achieved by introducing a bump structure on the wedge.The results demonstrate that this strategy for mixing and initiation effectively establishes the oblique detonation wave combustion flow field.To further investigate the fuel mixing and initiation processes in the oblique detonation engine,three-dimensional numerical simulations consistent with the experimental conditions were carried out using the ReynoldsAveraged Navier-Stokes(RANS)method.The simulation results reveal that the high-speed gas flow generates shock waves as it passes through the central strut and transverse fuel jets.These shock waves are reflected by the wall,forming a series of shocks in the mixing section.The kerosene injected from the strut injectors does not react during the mixing phase.However,due to the influence of the high-temperature boundary layer,the kerosene injected through the wall undergoes precombustion.The separation zone upstream of the bump generates separation shock waves,allowing the multi-wave point to stabilize at a short distance from the leading edge of the wedge.
文摘为了对自升式钻井平台插拔桩和冲桩过程进行研究,设计了一套自升式钻井平台插拔桩和冲桩试验系统。该系统能够提供最大50 k N的推力和拉力,以及最大压力为1 MPa的冲桩水,满足试验工况的要求;能够监测记录试验过程中的阻力、孔隙水压力、桩靴模型的位移和试验土体的性质。对试验系统的承力部位加载架进行了有限元分析,结果表明加载架的稳定性符合要求;当入泥深度在300 mm以内时,试验测得的阻力与SNAME(2008)推荐方法预测阻力吻合。所得结果验证了试验系统能够有效地模拟插拔桩及冲桩过程。
