Scramjet engines are considered a highly promising technology for improving high-speed flight. In this study, we investigate the effects of using multi-extruded nozzles on fuel mixing and distribution inside the combustion chamber at supersonic flow. Additionally, we explore the impact of an inner air jet on fuel mixing in annular nozzles. To model fuel penetration in the combustor, we employ a computational technique. Our study compares the roles of three different extruded injectors on fuel diffusion and distribution at supersonic cross-flow. Our findings reveal that the use of an inner air jet increases fuel mixing in the annular jet, while the use of extruded nozzles improves fuel distribution by enhancing the vortices between injectors. These results demonstrate the potential benefits of incorporating multi-extruded nozzles and inner air jets in the design of scramjet engines.

This study deals with dynamic modeling and analyzing of an innovative semi-solar greenhouse structure applying MATLAB software from the viewpoints of energy, exergy and economic. This Modeling is applied to predict the temperatures of four different points inside the semi-solar greenhouse, regarding the evapotranspiration of the crop. Measured data recorded from the constructed typical semi-solar greenhouse is used to evaluate the results of the proposed thermodynamic analysis. Measurements during the experiment show considerable temperature difference of 20 ℃ between the indoor and outdoor air. The mean values of 5.94% and 2.06℃ for MAPE(Mean Absolute Percentage Error) and RMSE(Root Mean Squared Error) indicates the accuracy of the thermal simulation. Furthermore, in different heat and mass transfer processes, the total exergy destruction values are analyzed. The target of this research is considered as providing suitable environmental conditions for the inside of the greenhouse. In this respect, the greenhouse air unit cost for each time step of one minute is inspected. By increasing the interest rate from 10% to 20% the greenhouse air unit cost raises almost twice. Decrease of about 45.36 % in total exergy destruction is obtained by the technique of applying double layer glass as the greenhouse cover.