China Academy of Launch Vehicle Technology

Schlieren visualization of detonation diffraction and initiation in B/C2H4/O2 heterogeneous mixtures using a variable-initial pressure pre-detonator tube

Solid powder detonation engines hold significant potential for enhancing aerospace propulsion performance, owing to the high volumetric energy density of solid fuels and the high thermal efficiency of the detonation cycle. These engines are typically ignited by a pre-detonator tu...

Optimization of combustion chamber geometry for the improved-double swirl combustion system based on the sensitivity analysis method

Based on the well-established double swirl combustion system (DSCS) for direct-injection diesel engines, a novel improved-double swirl combustion system (I-DSCS) has been proposed. Previous visualization experiment has verified the superiority of the I-DSCS in enhancing impinging...

Predictive Opportunistic Maintenance for k-out-of-n Systems with Heterogeneous Two-Stage Degradation

Predictive opportunistic maintenance can improve maintenance coordination in multi-component systems by jointly exploiting health information and shared maintenance opportunities. However, redundancy and component heterogeneity complicate maintenance timing and component selectio...

Use of a single CO₂ coolant in a Cascade manner for thermal protection of hypersonic vehicles

To address the thermal protection of hot-end components in hypersonic vehicles under extreme high-enthalpy aerodynamic heating, this study proposes and experimentally validates a channel–film combined cooling scheme based on the cascaded use of a single CO₂ coolant. Tests were co...

Enhancing the Rotational Bending Fatigue Performance of 20CrMoH via Carburizing and Surface Ultrasonic Nanotechnology

ABSTRACT To alleviate the risk of rotational bending fatigue (RBF) failure in 20CrMoH alloy steel, a hybrid surface modification strategy combining carburizing and surface ultrasonic nanotechnology (SUNT) is developed in the present work. The synergistic effects of the combined t...

Fluid–Structure Interaction Simulation of a Supersonic Reefed Parachute Cluster During the Inflation Process

To investigate the multi-stage inflation mechanism of a supersonic reefed parachute cluster, an ALE-based fluid–structure interaction method is applied. The canopy permeability is modeled using the Ergun equation, and the virtual structure contact method is employed to handle con...

Intelligent prediction of diesel engine dynamic performance and emissions via multi-signal fusion and Bayesian optimization

An intelligent prediction framework integrating multi-signal feature learning and Bayesian optimization is proposed to address the strong nonlinearity, multivariable coupling, and dynamic evolution of diesel engine performance and emissions under transient operating conditions. A...