tip leakage loss introduces major part of losses of the rotor in axial gas turbines. therefore, the rotor blade tip has a considerable effect on rotor efficiency. to understand the flow physics of the rotor tip leakage, we solve the flow field for different tip platforms (passive flow control) and by considering coolant tip injection (active flow control). various blade tip configurations such ...

Argument structure patterns can be used to represent classes of safety arguments. Such patterns can become quite complex, making use of loops and choices, posing a potential challenge for comprehension and evaluation, offsetting the likely gains that might follow from creating arguments using them. We show how complex patterns can be constructed by composition of simpler patterns. We provide a ...

A key question in flow control is that of the design optimal controllers when space high-dimensional and experimental or computational budget limited. We address this formidable challenge using a particular flavor machine learning present first application Bayesian optimization to open-loop for fluid flows. consider range acquisition functions, including recently introduced output-informed crit...

280 control on advanced, high-speed flight vehicles. Effective manipulation of a flow field using flow-control technologies can lead to a number of significant benefits to aerospace vehicle systems, including enhanced performance, maneuverability, payload, and range, as well as lowered overall cost. A research team led by APL is investigating the time-dependent fluid dynamic interactions betwee...

Tip leakage loss introduces major part of losses of the rotor in axial gas turbines. Therefore, the rotor blade tip has a considerable effect on rotor efficiency. To understand the flow physics of the rotor tip leakage, we solve the flow field for different tip platforms (passive flow control) and by considering coolant tip injection (active flow control). Various blade tip configurations s...

Aerodynamic drag is an important factor in vehicles fuel consumption. Pressure drag which is the main component of total drag is a result of boundary layer separation from vehicle surface. Flow control methods are applied to avoid or at least delay separation. Depending upon whether these methods consume energy to control the flow or not, they are called active or passive control methods. In th...