Abstract:
A method of designing a morphable aerodynamic surface includes discretizing and parameterizing a model of a morphable surface to create a function to optimize; utilizing finite element analysis to solve for displacements and associated errors at an initialization point; and iteratively calculating a gradient cost function, define step size and search direction, step according to defined step size and search direction, and recalculate displacements and associated errors to converge on final thickness vector.
Abstract:
A hypersonic aircraft having a homopolar motor with high temperature superconducting (HTS) non-insulated (NI) coil magnets is described. In some implementations, the HTS NI coil magnets can have a graded resistance design. In some implementations, the HTS NI coil magnets can include a series of stacked coils, each of the series of coils comprising multiple turns having turn-to-turn resistance, where the turn-to-turn resistance of the series of coils is graded coil-to-coil across the magnet. In some implementations, the HTS NI coil magnets can include an NI coil comprising multiple turns and two or more thermal barriers each disposed between two adjacent turns of the coil, where an electrically conductive portion of one of the thermal barriers does not overlap with an electrically conductive portion of a different adjacent one of the thermal barriers. Some implementations can include a disk-type homopolar motor/generator including one or more HTS NI coil magnets.
Abstract:
A propulsion system for a supersonic aircraft includes an engine, a compression surface upstream of the engine, a shroud surrounding the engine configured to direct airflow passing over the compression surface towards the engine, and a plurality of vortex generators positioned upstream of the engine. The vortex generators have a height such that when the supersonic aircraft is flown at a predetermined speed, the plurality of vortex generators create a plurality of vortices that propagate partially outside of a boundary layer formed proximate a surface of a supersonic inlet. The vortices cause a high-velocity portion of the airflow to move towards a portion of the engine having a higher sensitivity to changes in stagnation pressure and a low-velocity portion of the airflow to move away from the portion of the engine having the higher sensitivity to changes in stagnation pressure prior to the airflow reaching a face of the engine.
Abstract:
Заявляемое изобретение имеет отношение к авиации и касается в частности сверхзвуковых пассажирских самолетов. В одном из возможных вариантов своего исполнения заявляемое изобретение имеет крыло, фюзеляж, два турбореактивных двигателя (ТРД), расположенных в хвостовой части фюзеляжа один над другим в плоскости симметрии самолета. При этом, сверхзвуковой воздухозаборник верхнего ТРД расположен с верхней стороны носовой части фюзеляжа, а сверхзвуковой воздухозаборник нижнего ВРД расположен с нижней стороны носовой части фюзеляжа. Функцию генератора скачков уплотнения в вышеуказанных сверхзвуковых воздухозаборниках выполняет носовая часть фюзеляжа, выполненная в виде горизонтального многоступенчатого клина. Крыло установлено по схеме «высокоплан».
Abstract:
Aircraft configured to operate at Mach numbers from above.80 and up to 1.2 with wing sweep angles defined by the wing outboard leading edge of less than 35 degrees, and incorporating calculated values of the ratio of outboard wing panel aspect ratio raised to an exponent of.78, divided by the ratio of maximum thickness divided by chord (t/c), greater than about 45, and having one of the following: a) where maximum thickness divided by chord (t/c) is at a location approximately 70% of the distance outboard from the attaching aircraft body to the wing tip, or b) where maximum thickness divided by chord (t/c) is the average value of (t/c)'s located between approximately 50% of the distance outboard from the attaching aircraft body to the wing tip.
Abstract:
An aircraft (100) designed for transonic speed comprises an airfoil (102), a nacelle (122), an engine (116), and an inverted V-tail (114). The nacelle is mounted on the lower aerodynamic airfoil surface and behind the trailing edge of the airfoil. The engine is enclosed within and structurally supported by the nacelle. The inverted-V tail is coupled to the airfoil at a position on the upper aerodynamic surface directly across the airfoil surface so that the inverted-V tail structurally supports the nacelle and engine in combination with support from the airfoil.
Abstract:
A method for designing a low drag vehicle includes determining a plurality of configurations for at least two different Mach numbers that minimize the rate of change of cross-sectional area distribution of the vehicle in accordance with the Sears-Haack minimum drag body. The configurations can be weighted to emphasize optimum performance at particular operating conditions before averaging the configurations. The second order derivative of cross-sectional area distribution for the final configuration can be smoothed, and then integrated twice to determine the cross-sectional area distribution. A vertical stabilizer can be configured with one or more "waisted" sections to minimize the rate of change of cross-sectional area distribution of the vehicle or device to which the vertical stabilizer is mounted.