Supersonic film cooling using fuel on board is an effective way to simultaneously shield the huge heat and momentum flux transported from mainstream wall in a scramjet engine. The self-ignition combustion of injected will significantly change turbulent transport behavior boundary layer. To reveal effects layer near-wall turbulence fluxes, large eddy simulations (LES) Burrows–Kurkov supersonic experiment hydrogen as are performed based in-house solver scramjetFoam. successfully captures...

Abstract The prediction of flow distribution in regenerative cooling channels scramjet can provide valuable reference information for regulation. non-intrusive monitoring method based on deep learning is a promising approach. In this work, generative adversarial networks-like (GAN-like) model proposed, where the generator and discriminator are employed temperature field reconstruction respectively. utilizes sensor data to reconstruct combustor outer wall, while employs generated forecast...

The investigation of film cooling in CH4/O2 rocket engines holds paramount importance the advancement propulsion. However, wall heat flux is always overestimated numerical simulation processes. Hence, this article proposes a framework that employs Reynolds averaged Navier–Stokes method to simulate single-element gaseous CH4/gaseous O2 combustion chamber, which basis for engine simulations. coupled function considers chemical reaction effects introduced enhance accuracy prediction. impact...

A bio-diesel is growing in popularity as a renewable fuel dealing with increasing efficiency demands and emission restrictions. The combustion injection characteristics of 186 FA diesel engine were analyzed blends different proportions at both full 50% load through combination numerical simulation experimental study. heat release rates the main parameters cyclic variations compared analyzed. development concentration temperature field well simulated. It shown that, blended bio-diesel, values...

Abstract The debate on creep in primary consolidation is analysed with a power law model following an approach which considered as rate of loading. According to this approach, one type To verify two types tests, standard oedometer test and drainage prevented, are conducted three soils (two from NGES the other Port Guangzhou). result: exponents obtained kinds tests agree well each other. Moreover, further validated by tracking, for over 80 years, data settlement case history San Jacinto...

One of the effective methods to simultaneously achieve thermal protection and friction reduction requirement a scramjet engine is usage fuel film cooling. As combustion process inside combustor proceeds, oxygen concentration in burnt gas gradually decreases will influence characteristics hydrocarbon film. Therefore, effects mainstream on are evaluated by numerical simulations based RANS framework. The results indicate that cooling performance not sensitive concentration, although burns more...

Hydrogen fueled parallel wall-jet combustion is considered to be one of the most promising drag reduction technologies in supersonic combustors, researchers mainly focus on its mechanism, while balancing efficiency and performance great significance for engine energy conservation. In this paper, hydrogen numerically investigated. Kinetic reaction rate scalar dissipation are defined decouple chemical mixing processes. Results indicate that although a nonequilibrium process, process dominated...

Few-layer MoS2 nanosheets have been successfully synthesized by a facile anionic surfactantassisted hydrothermal approach. The as-prepared samples are characterized X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and transmission (TEM). It is found that the surfactant sodium dodecylbenzene sulfonate (SDBS) plays crucial role in formation of with few layers rich exposed edges. electrochemical performances evaluated cyclic voltammogram, galvanostatic...

Hydrocarbon fueled supersonic film is considered to be one of the most effective methods for achieving thermal protection and drag reduction meanwhile in scramjet combustors. In this paper, effects mainstream inflow parameters on characteristics hydrocarbon with combustion are numerically investigated. The results indicate that, based traditional without chemical reaction, brings beneficial mainly depend relative proportion location exothermic reactions boundary layer. It found only change...

Abstract In order to study the shearing strength characteristics of sandy pebble soil in southeast Tibet, this paper takes packing high road embankment lalin grade highway as research object, and conducts particle analysis test on soil. On basis natural gradation, sand was gradated improved. paper, undisturbed with improved gradation were tested by direct shear tests under different vertical pressures.The results show that stress-strain relationship is mostly strain softening. The shears...