256 results about "Nozzle throat" patented technology

A variable geometry convergent-divergent nozzle for a gas turbine engine includes a centerbody extending rearward along a longitudinal axis of the engine which has a throat section of increased diameter. An inner shroud surrounds the centerbody and cooperates with the centerbody to define the throat of the nozzle. An outer shroud surrounds the inner shroud and cooperates with the centerbody to define the exit area of the nozzle. Both shrouds are independently translatable to provide independent control of the nozzle throat area and the nozzle expansion ratio.

A thrust vector control system for a flight vehicle comprises a fixed nozzle defining a first thrust vector direction and at least one exhaust deflector moveable to a location downstream of said fixed nozzle to provide a second thrust vector direction. Movement of the at least one exhaust deflector may allow for simultaneous control of both thrust vector direction and nozzle throat area. Translational motion of each exhaust deflector may be independently controlled. A flight vehicle incorporating a thrust vector control apparatus, and a method for thrust vector control are also disclosed.

The invention relates to a bypass turbomachine comprising a gas turbine engine provided with a fan disposed on a longitudinal axis of the turbomachine, and an annular nacelle surrounding the engine so as to define a cold stream flow channel, the nacelle having an upstream end surrounding the fan of the engine and a stationary downstream end forming a gas exhaust nozzle, the nozzle having a throat section that corresponds to its smallest cross-section. The turbomachine further comprises means for taking in air from the cold stream flow channel upstream from the nozzle throat section, and means for injecting the taken-in air downstream from the nozzle throat section so as to open the throat section artificially.

The present invention discloses a laser-assisted cold spray coating method and a nozzle apparatus. According to the nozzle apparatus, one side of the nozzle throat portion is a nozzle constriction section, the other side of the nozzle throat portion is a nozzle expansion section, the nozzle side on the nozzle constriction section is provided with a high pressure gas inlet and a light transmittance window for entering of a laser beam, the light transmittance window deviates from the axis line of the nozzle, the nozzle on the nozzle constriction section is provided with a reflecting mirror A, the nozzle side on the nozzle expansion section is provided with a powder inlet, a reflecting mirror B, a reflecting mirror C and a reflecting mirror D, a laser beam entering from the light transmittance window sequentially passes through the reflecting mirror A, the reflecting mirror D, the reflecting mirror B and the reflecting mirror C in the nozzle and then is emitted from the nozzle expansion section, and the powder inlet is positioned between the reflecting mirror D and the reflecting mirror B; and according to the technical scheme, the laser is incident onto the reflecting mirror in the nozzle in a certain angle forming with the nozzle axis line, and the light beam is subjected to multiple reflections through the reflecting mirrors on the inner wall of the nozzle and finally irradiates on the substrate, such that the gas, the powder and the substrate inside the nozzle can be uniformly pre-heated.

According to the present invention, the A/R, the ratio of cross sectional area A of scroll passage to scroll radius R can be increased without increasing the size of the turbine casing and with very simple construction and exhaust turbine capacity can be increased, so a variable-throat exhaust turbocharger with which engine output can be increased is provided. The turbocharger is equipped with a nozzle throat area varying mechanism of which the nozzle assembly unit is composed such that a plurality of nozzle vanes are supported rotatably by an annular nozzle mount and an annular nozzle plate is connected to the nozzle mount by means of a plurality of nozzle supports to sandwich the nozzle vanes, the nozzle plate is located in the scroll chamber by attaching the nozzle assembly unit to the turbine casing to allow the nozzle plate to form part of the inside sidewall face of the scroll chamber and a wall face of the annular flow passage.

The invention provides a differential adjustable unilateral expansion nozzle. In the invention, a nozzle throat area is bilaterally adjustable and differential adjustment can be carried out to ensure that an engine flow variation requirement is satisfied in a whole flight envelope; an nozzle exit area is adjustable to ensure that a gas ideal complete expansion requirement can be satisfied in a certain flight Mach number range; and the upper web of a nozzle is divided into an adjustable upper web and a fixed upper web between which a certain gap exists and the after body of an aircraft can be directly utilized by the fixed upper web so that that the operating force of a movement mechanism can be reduced. A boundary layer discharged from a front fuselage can be injected into the fixed upperweb through the gap under the flight conditions of transonic speed and low supersonic speed; and therefore, the wall static pressure of the fixed upper web is increased, the thrust loss caused by airflow overexpansion is decreased, meanwhile, the pitching moment of the aircraft is reduced and the nozzle is ensured to always achieve a higher thrust coefficient in the broad flight envelope, in addition, the cooling of the fixed upper web can be strengthened and the thermal load and the infrared signal characteristic of the nozzle are reduced.

A high recovery sonic gas valve design with the inlet flow entering transverse and orthogonal to the outlet flow is presented. The configuration cancels the effects of the inlet flow entering orthogonal to the axis of the nozzle and diffuser. The inlet passage is curved in a manner to let the flow enter along the centerline of the nozzle and diffuser. The nozzle is contoured and provides upstream flow impedance. The diffuser is contoured with the area gradient varying from a low positive value at the nozzle throat then to a maximum value and finally dropping off significantly to near zero prior to the nozzle exit. The diffuser is nearly cylindrical and may extend past the valve outlet flange and protrude into adjacent piping.

A method of constructing self-powered air-conditioner comprises a convergent divergent nozzle where powered fan pushes air into said nozzle. While the pushed air accelerates toward the nozzle throat it becomes colder as air internal energy transformed into kinetic energy. An axial turbine installed within the nozzle throat extracts energy from the air in the nozzle and drives an electrical generator that provides electricity to the fan electric motor. Alternatively the turbine and fan are installed on common shaft, which could be the electric generator shaft. The cold air within the nozzle throat cools the nozzle throat skin, which serves as air-conditioner core. The cold nozzle skin is wrapped with coiled pipes in which liquid flows, becomes colder and this cold liquid flows away to heat exchanger where air is flowing through it and becomes colder. This cold air is then flows into spaces needed to be air-conditioned.

The invention relates to a magnetic nozzle of a variable specific impulse magnetic plasma rocket, aiming at solving the problem of speed waste during acceleration of a plasma body in an electric propulsion system and relating to the design technology of the magnetic nozzle of the variable specific impulse magnetic plasma rocket. The magnetic nozzle of the variable specific impulse magnetic plasma rocket is used for changing a circumferential speed of the plasma body to an axial speed and belongs to the magnetic fluid technology field. The magnetic nozzle which is used as the last stage of the variable specific impulse magnetic plasma rocket is arranged at the tail end of a rocket engine and consists of a sprayer nozzle and a superconducting coil, wherein, the sprayer nozzle is arranged at the tail end of a shell body of the rocket engine and is an expanding nozzle, the nozzle expansion ratio which is the ratio between a nozzle exit area and a nozzle throat area is 40:1, the nozzle is made of a heat-resisting and ablation-resisting alloy material to reduce ablation and thrust eccentricity.

The invention discloses a flow auto-adjustment jet flow vacuum generating device, comprising a section of flow auto-adjustment and a vacuum generating section. A needle valve used for adjustment is positioned at the front of a jet nozzle throat of the vacuum generating section. Meanwhile the needle valve can feed back the vacuum pressure to a right cavity of an active cylinder of the vacuum generating device to make a pressure difference between the right cavity and a left cavity of the active cylinder which is communicated with the atmosphere to drive the active valve and to drive the passive valve through magnetic driving, finally to drive the needle valve which is fixedly connected with the passive valve to move. The invention not only realizes the dual purposes of fast response in vacuum and saving energy sources, but also realizes the auto adjustment to the flow of air supply for the position of the needle valve can be adjusted according to vacuum level. Meanwhile, if the vacuum level changes, the needle valve can look for a new balance point automatically. Thus the vacuum generating device has the function of automatic adjustment of the air supply flow and is suitable for various working conditions.

A constant volume combustion chamber, combustor, and method for constant volume combustion involve combusting a fuel in a chamber sealed by a pintle having a conical portion fitted into a conical nozzle throat and pulling the pintle away from the nozzle throat to allow combustion products to exhaust through a nozzle outlet. The shapes and surfaces of the pintle and nozzle throat provide for sealing the chamber at high pressures while resisting surface wear. Operational parameters for the combustor may be computer controlled in response to measured pressures and temperatures in the combustor.

A method of varying a fan duct nozzle throat area of a gas turbine engine includes pivoting a fan nozzle outwardly relative to a longitudinal axis of the gas turbine engine. The fan nozzle is configured to move axially non-contemporaneously with the pivoting of the fan nozzle.

Wind machines are disclosed in which the pressure energy of the wind is converted into electrical energy. A nozzle unobstructed by any turbine or propeller bearing a significant load is made to face the wind. The nozzle converts the pressure energy of the wind into kinetic energy. In one embodiment a turbine is disposed around the throat of the nozzle and air sucked through the turbine and exhausted through the throat of the nozzle. An obstruction at the turbine inlets is placed in such a way as to cause a pressure variation on either side of the obstruction, causing the turbine to rotate. In a second embodiment a small turbine within the throat of the nozzle is made to revolve several three way ball valves. These valves open and close passage-ways so as to admit or evacuate air from one side of pistons in cylinders of an atmospheric engine. The low pressure in the volume of the nozzle throat serves as an energy sink. The other side of the pistons are open to the atmosphere.

The invention relates to a method for preparing a copper-base tungsten coating through a compounded process of laser and thermal spraying. The method is characterized by comprising the following steps of: preparing a nickel base alloy transition bottom layer on the surface of a copper matrix by using a low pressure plasma coating system, and remelting the transition bottom layer with laser beams; and then preparing an intermediate transmission layer and the tungsten coating of a Ni-W alloy by using the low pressure plasma coating system, and then remelting with the laser beams to obtain the tungsten coating. By using a gradient coating structure, the method effectively solves the problem of thermal stress caused by mismatching of the coefficient of thermal expansion of the copper and the tungsten, and improves the cohesion strength of the tungsten coating and the matrix, the tungsten coating and the tungsten coating. The coating and the matrix can achieve metallurgical bonding by using the laser beam remelting, bonding property is also improved and the tungsten coating with compact surface is obtained. The tungsten coating prepared by the method has excellent anti-heat radiation and anti-thermal shock properties and is suitable to be used as heated end component materials in equipment, such as first wall material in a ray target, a rocket nozzle, an airplane nozzle throat and a nuclear fusion device.

A solid rocket motor including a combustion chamber, in which propellant is ignited to produce combustion gas, and a nozzle having a throat with an effective flow area, implements a system and method to inject gas into the nozzle throat to control its effective cross sectional flow area. Controlling the effective cross sectional flow area of the nozzle throat in turn controls combustion chamber pressure, thus the burn rate of the propellant in the combustion chamber, and thus the thrust generated thereby.