5results about How to "Good low speed performance" patented technology

The invention provides a supersonic-speed jet adopting supersonic-speed double wings and variant design, and belongs to the field of novel supersonic-speed civil aircrafts, a large-area truncated delta wing with edgings on the inner side is adopted, an engine nacelle is arranged on the upper portion of the outer end of the large-area truncated delta wing, and the supersonic-speed double wings are installed on the outer side of the nacelle; the front edges and the rear edges of the upper wing and the lower wing of the supersonic double-wing adopt intelligent materials to realize a variant function; the empennage can rotate around a mounting shaft in the longitudinal direction of the airplane to change the inclination angle; the front edge and the rear edge of the supersonic double-wing are deformed, and the inclination angle of the empennage is changed to jointly form a supersonic state and a subsonic state. The problem that the conventional double-wing non-design-point performance is poor is solved, high aerodynamic performance can be achieved within the flight envelope range, and it is guaranteed that an aircraft achieves ideal supersonic speed environment-friendly performance such as acoustic explosion and noise and aerodynamic efficiency.

The invention relates to the field of turbochargers, in particular to a turbocharger all-working-condition supercharging structure which comprises a gas guide shell, a connecting shell, a second volute, a middle shell and a first volute which are fixedly connected in sequence, and a turbine shaft is installed in the middle shell; a turbine impeller is fixedly installed at the first end of the turbine shaft, a gas compressor impeller is fixedly installed at the second end of the turbine shaft, the turbine impeller is located in the first volute, and the gas compressor impeller is located in the second volute. The second end of the turbine shaft penetrates through the compressor impeller and is fixedly connected with the movable impeller; the air compressor further comprises a static impeller, and the static impeller is fixed to the connecting position of the air guide shell and the connecting shell and located between the movable impeller and the air compressor impeller. According to the invention, gas can be compressed twice, and enough gas can be fed into the engine at a low speed, so that hysteresis is avoided.

The present invention provides a flapping-gliding switching mechanism, method and system of a flapping-wing flying robot, and relates to the technical field of unmanned aerial vehicles. The mechanism includes: a main beam, a mounting frame, a motor, a gear assembly and a crank-connecting rod assembly, wherein the mounting frame is mounted on the main beam and arranged below the main beam; the gear assembly is mounted on the mounting frame, and the motor drives the gear assembly to rotate; two crank-rocker arm structures are respectively mounted on both sides of the gear assembly and are symmetrically arranged, one end of the crank-connecting rod assembly is connected to the output shaft of the gear assembly, and the other end of the crank-connecting rod assembly is rotatably mounted on a fixed frame, and the fixed frame is mounted on the mounting frame; when the flapping mode is switched to the gliding mode, the motor drives the crank-rocker arm assembly to rotate so that the wing hovers at the target flapping angle, which solves the problems of failure rate and difficulty in changing the wing flapping angle during gliding under the traditional mechanical solution.

The foldable double-engine front-pulling delta wing aircraft comprises a fuselage, a left wing and a right wing, and the fuselage is provided with an upper wing platform and a lower equipment cabin; the left wing and the right wing are hinged to the lower edge of the wing platform through a folding mechanism, and the left wing and the right wing can be folded downwards to be parallel to the fuselage and can be automatically unfolded to coincide with the plane of the wing platform in an unfolded flight state; double-engine power systems are arranged at the front edges of the left wing and the right wing; vertical fins are mounted at wingtips of the left wing and the right wing. The invention has the following beneficial effects: in a folded storage state, the occupied space is small, and the portability is good; unfolding is easy, and using convenience is good; power is strong, no reverse torsional moment exists, and flight is stable; the system is suitable for various takeoff modes; and the safety of the unmanned aerial vehicle in the landing process is effectively protected. The unfolding mechanism is simple, reliable and light in weight, the machine body space is huge, and various loads can be conveniently installed to complete different tasks.

The application provides a turbocharger, which belongs to the technical field of turbocharging technology and specifically relates to a turbocharger, which comprises a compressor and a turbine, the impeller of the compressor and the impeller of the turbine are connected through a first rotating shaft, the compressor is arranged at the first end of the first rotating shaft, and the turbine is arranged at the second end of the first rotating shaft; a boost turbine is arranged at one end of the compressor, the boost turbine has a second rotating shaft coaxial with the first rotating shaft, the second end of the second rotating shaft can be connected with the first end of the first rotating shaft; the boost turbine is driven by compressed air, and the second rotating shaft of the boost turbine can drive the first rotating shaft to rotate together when the second rotating shaft rotates. The turbocharger can start the boost turbine driven by compressed air when the engine is in a low-speed working condition, the boost turbine is used to improve the rotating speed of the turbocharger, and thus the low-speed performance of the engine is improved. The application further provides an engine and a power system of the turbocharger, and the reliability and safety are high.