Scramjet unstart occurs when a strong shock initiated from disturbances in the engine propagates upstream and finally spills out of the engine inlet. When unstart occurs, the airflow into the engine is greatly diminished, leading to loss-of-thrust and engine stall. Because the probablility of unstart increases with increasing heat-release, the danger of unstart is an important limiting factor o...

the preparation of air–fuel mixture is considerably dependent on fluid flow dynamics to achieve improved performance, efficiency, and engine combustion in the appearance of flow. in this study, the effects of mixtures of hydrogen and compressed natural gas (cng) on a spark ignition engine are numerically considered. this article presents the results of a direct-injection engine using methane–hy...

A kind of microcapsule sustained-release–type hydration heat inhibitor (MSR) was prepared. The effect MSR on semi-adiabatic temperature rise, setting time, and strength low-heat Portland cement investigated. Microcalorimetry, XRD, SEM, TG-DSC were used to investigate the mechanism cement. results showed that had good regulating When dosage 0.3%, release rate decreased by 10% peak 52%. 3D compre...

A series of aluminum hypophosphite (AHPi)/graphite-like carbon nitride (g-C₃N₄) (designated as CAHPi) hybrids were prepared, followed by incorporation into thermoplastic polyurethane (TPU). The introduction of CAHPi hybrids into TPU led to a marked reduction in the peak of the heat release rate (pHRR), total heat release, weight loss rate, smoke production rate and total smoke production (TSP)....

We present a heat release dynamics model which utilizes a well-stirred reactor (WSR) model and one-step kinetics to describe the unsteady combustion process. The model incorporates the linearized mass and energy equations to describe the response of the reactor to external perturbations, and is cast in the form of a first order filter. The model is able to predict the phase between the mass flo...