Ammonia (NH3) is currently considered to be a potential carbon-free alternative fuel, and its large-scale use as such would certainly decrease greenhouse gas emissions meet increasingly stringent emission requirements. Although the low flame propagation speed high NO production of NH3 hinder direct application renewable co-combustion NH3–H2 an effective way overcome these challenges. In this study, combustion characteristics swirling flames under different equivalence ratios H2 blending...

Correct evaluation of the blades' surface temperature field is crucial to structural design and operational safety aero-engine turbine blades. Current high-temperature measurement technology can only measure limited discrete points hot-end If boundary conditions are completely unknown, it still difficult solve equations through traditional computational fluid dynamics methods. It an inverse problem predict engine blade with unknown conditions. This paper proposes a two-dimensional inversion...

In practical aerodynamic scenarios, interactions between curved shock waves and boundary layers with composite curvatures in both streamwise spanwise directions are encountered more frequently than those induced by planar oblique shocks. To gain a systematic understanding of this phenomenon physics, internal external axisymmetric wave/boundary layer (AC-SBLI) being studied analytically establishing the underlying relations within flow structures. Specifically, based on reconstructing...

Advantages and concerns of hypersonic inward turning inlets are discussed in this paper. Inward have the following essential advantages: 1) high compression ratio, 2) short length axial direction, 3) small wetted area, 4) mass capture rate, 5) good performance at off-design conditions, 6) low drag while operating. In addition, there another three potential advantages proposed, which might further enhance popularity these inlets. That is, suitability for working together with round...

Experiments are performed for the characteristics of internal waves generated by four horizontally towed models, including a sphere and three slender models with different aspect ratios in density stratified fluid strong halocline. The Reynolds number ranges within 3500 < Re = UD/ν 126 000, Froude 0.4 Fr U/NmaxD 18. Based on time histories perturbation analysis correlation velocity it is shown that body-generated stationary multiple-mode Lee waves, while wake-generated non-stationary...

Mach reflection (MR) is an essential component in the development of shock theory, as incident curvature found to have a significant effect on MR patterns. Curved-shock (CMR) not yet adequately understood due rotational complexity behind curved shocks. Here, CMR steady, planar/axisymmetric flows analyzed supplement well-studied phenomena caused by oblique-shock (OMR). The solution from von Neumann's three-shock theory does fully describe case. A structure presented and characterized shock,...

Oblique detonation waves (ODWs) are induced by oblique shock (OSWs) and hold significant research value for air-breathing ramjet engines due to their high thermodynamic efficiency specific impulse. In this research, is using a curved wave (CSW) that provides greater flexibility compared an OSW. Curved (CDWs) classified into two categories based on the curvature of CSW: positive-curvature (PC-CDWs) negative-curvature (NC-CDWs). We conduct numerical investigation flow characteristics potential...

The mixing effectiveness of the airflow between inner and outer bypass inlets a Rear Variable-Area Bypass Injector (RVABI) is key to afterburner performance variable cycle engines. This paper describes an optimized RVABI design based on alternating area regulator improve velocity/temperature uniformity incoming flow at afterburner. Compared with classical RVABI, numerical simulations show that proposed performs better in terms thermal efficiency total pressure loss different engine modes....

Gradient-based aerodynamic optimization methods involve complex gradient calculations with high computational costs. To address these problems, this paper proposes a rapid deep learning-based method for predicting the force gradients and establishes an framework. A neural network is used to determine latent mapping relationship between near-wall flow field information gradients, resulting prediction model integrated into platform. Combining grid deformation techniques gradient-based enables...

The initiation of oblique detonation waves (ODWs) is a key component the successful application wave engines (ODWEs). This paper numerically investigates ODWs under active control transverse jet by solving two-dimensional multi-species Euler equations, focusing on morphology flow fields as well relationship between structures and propulsive performance using concept thrust potential. Active significantly shortens length ODW. results reveal that jet-induced field shows four typical patterns...