In hypersonic boundary layers, Mack modes play a crucial role in flow instability, whose secondary instability is hot research topic. Since flight vehicles will probably work under high-stagnation temperature conditions, which significantly affect the aerodynamic heating calculation and aero-thermal protection design of vehicles, it necessary to compare primary instabilities layers that Boeing/...

The vapor compression cooling devices operate on the same principle as heat pumps. In these types of machines thermal energy is transferred from cold environment to warmer side using provided power by compressor. this study, effect air flow rate performance has been investigated simulating a designed system in AVL CRUISE™ M program. simulated model air-to-air machine and refrigerant R134a was u...

background: the phase change materials (pcms) have the appropriate properties for controlling heat strain. one of the well-known pcms is paraffin. this study aimed to design the cooling vest from the cheap commercial paraffin compound and evaluation of its effectiveness under laboratory hot conditions. methods: the cooling vest was made of the polyester fabric and it had 17 aluminum packs. the ...

The flow in the turbine endwall region consists of complicated secondary structures driven by lateral pressure gradient, which heavily affects performance film cooling. In this work, film-cooling hole design optimization is performed considering existence gradient real environment. Results have shown that optimal influenced region, especially compound angle clearly different from flat plate res...

Gas turbine engines have a high power-to-weight ratio, making them ideal for generation of aircraft thrust, and can have excellent electrical power generation efficiencies when used in a combined cycle power plant. A complex vortical flow at the junction of the nozzle guide vane airfoil and its casing (endwall) in the turbine section tends to decrease aerodynamic efficiency and increase metal t...