摘要:
An aircraft (10) is provided including a fuselage (12) extending between a forward end (16) and an aft end (18). An aft engine is mounted to the fuselage (12) at the aft end of the fuselage (18). The aft engine includes a nacelle (306) having a forward section. An airflow duct (344) is also provided extending at least partially through the nacelle (306) and including an opening on the forward section of the nacelle (330). The opening is configured for providing an airflow to, or receiving an airflow from, the forward section of the nacelle (306) to increase an amount of, e.g., boundary layer airflow received within the aft engine during operation of the aircraft (10), to guide the flow of boundary layer airflow into the engine more smoothly, or to reduce a distortion on the engine.
摘要:
Die vorliegende Erfindung beschreibt einen Fluidaktuator (1) zur Beeinflussung einer Strömung eines Umgebungsfluids entlang einer Strömungsoberfläche (100a), mit einem Ausblaskanal (10) zur Verbindung mit einer Druckfluidquelle (240) und mit einer in der Strömungsoberfläche (100a) ausgebildeten Oberflächenausblasöffnung (110) und einem Ansaugkanal (20) zum Anschluss an eine in der Strömungsoberfläche (100a) ausgebildete Oberflächenansaugöffnung (120), wobei der Ansaugkanal (20) an einer Entrainmentöffnung (22A) in den Ausblaskanal (10) einmündet. Ferner ist ein Strömungskörper (100) mit einem Fluidaktuator (1) beschrieben.
摘要:
A strain amplification structure has a frame with a hexagonal structure incorporating a plurality of rigid beams (16a) that are connected to opposing end beams by a plurality of flexible joints (24). A piezoceramic actuator assembly (26) is connected to the opposing end beams having a collar (32)including an opening. A shaft (18) providing an output is connected to the plurality of rigid beams with flexible joints and passes through the opening in the collar (32) for non-interfering motion orthogonal to the actuator assembly.
摘要:
Aircraft with a fuselage, wings, horizontal stabilizers and a vertical stabilizer, wherein on the front portion of the vertical stabilizer an elongated one-piece nose element (20) is mounted which forms lateral air guide surfaces, and to the front end of the nose element (20) a perforated metal plate nose member (25) is attached, and wherein the front end of the nose element (20) is closed and between this closed front end and the nose member (25) an elongated air channel (9) is formed.
摘要:
A jet generator (100; 230) is controlled by providing an input signal at a variable frequency to the jet generator (100; 230) and to a simulated electrical load of the jet generator (100; 230), measuring a difference in signals between the jet generator (100; 230) and the simulated electrical load to identify an optimum flow of a jet generated by the jet generator (100; 230), and tuning the frequency of the input signal to maintain the jet at the optimum flow. (Fig. 2)
摘要:
Apparatus and methods to operate laminar flow control system doors with improved reliability and serviceability are described herein. One described example apparatus includes a fin (314) of an aircraft, a door assembly (404) on a first side of the fin having a first door (419) defining a first opening and second door (426) defining a second opening. The example apparatus also includes a perforated surface proximate a leading edge of the fin and an actuator (412) disposed in the aircraft. The actuator drives a linkage (402) that couples the door to the actuator. The linkage is to operate the door in a first open mode in which the first opening faces in a first direction to create a suction airflow path between the perforated surface and the first opening, and a second open mode in which the second opening faces in a second direction to create a purge airflow path between the second opening and the perforated surface.
摘要:
A method for actively manipulating a primary fluid flow over a surface using an active flow control system including an active fluid flow device to provide lift enhancement and lift destruction. The method including the disposing of an active fluid flow device in the surface. The active fluid flow device is then operated to generate at least one of a steady blowing secondary fluid flow, a pulsed secondary fluid flow or an oscillating secondary fluid flow. While flowing the primary fluid over the surface to create a primary flow field, a secondary fluid flow is injected in an upstream direction and substantially opposed to the incoming primary fluid flow. The injecting of the secondary fluid flow in this manner provides for influencing of the primary flow field by manipulating a momentum of the secondary fluid flow to influence the incoming primary fluid flow and resultant lift.