摘要:
System and method for starting a turbine engine are disclosed. These systems and methods for starting a turbine engine may be located on a vehicle, such as such as a Class 8 vehicle, equipped with a turbine engine as the prime mover or as a generator in a hybrid powertrain. In that regard, a fluid forcing device may be employed to start the turbine engine, such as an electric pump/compressor. The fluid forcing device may already be located on the vehicle for other purposes, and can include an electrically powered steering pump (also referred to as an electric pump) or an electrically powered air brake compressor (also referred to as an electric compressor). In order to start the turbine engine, the output of the electric pump/compressor drives an associated fluid circuit, which in turn, supplies fluid over a portion of the turbine shaft, wheel or scroll in order to impart rotational motion thereto. The rotational motion imparted to the turbine shaft, wheel or scroll aims to start the turbine engine. Once started, the output of the electric pump/compressor is either inhibited or redirected to power other devices, such as one or more vehicle accessories (e.g., steering gear, air brakes, power take off (PTO), air conditioner, etc).
摘要:
A valve skirt is connected to a shaft. The shaft extends in a rearward direction away from the skirt and has rack teeth at a location spaced away from the skirt. A tab is positioned between the skirt and the rack teeth, and has at least one flat surface. A rack support supports the rack for axial movement, and the rack support has a support ear that has a flat surface engaging the flat surface on the rack to prevent relative rotation of the rack when driven by a pinion gear. An air starter valve, a gas turbine engine and a method are also disclosed.
摘要:
An air turbine starter includes a starter housing and a check valve. The check valve is disposed within the starter housing and is configured, in response to a pressure differential across the check valve, to selectively allow and prevent lubricant to flow therefrom. The check valve includes a valve includes a valve body, a valve seat, a valve bore, a valve element, and a plurality of rounded grooves. The valve bore is formed in the valve body between the valve seat and the lubricant outlet port. The valve element is disposed within the valve bore and is movable between a plurality of open positions and a closed position. The rounded grooves are formed in the valve body, and are disposed adjacent to, and in fluid communication with, the valve bore to improve lubricant to flow past the valve element when the valve element is in an open position.
摘要:
In a system in which a large motor, to be energized from a power grid, is connected to drive a main fluid drive through a main impeller shaft that has a main impeller shaft gear mounted on it, a relatively small start-up motor is provided, driving a start-up fluid drive. A start-up gear is connected to be driven by the start-up fluid drive and selectively to drive the main impeller shaft gear, and to be disengaged from the main impeller shaft gear. In operation, the small motor is first started, with the start-up gear engaging the main impeller shaft gear, and brought up to a speed at which the large motor begins to rotate at close to synchronous speed with the electrical frequency of the grid, at which point the large motor is connected to the grid.
摘要:
The device involves the placement of an air pump turbine and the aircraft outflow valve in a duct through which all the air flows, with the turbine shaft attached to that of an electric generator, to a hydraulic pump, and to the N2 and accessory gearbox inside the engine, the air is also sent through a duct to strike inclined against the tips of the fan blades and against the tips of the first stage of the low speed compressor blades of the turbine engine.
摘要:
A fuel control system for accurately controlling the fuel flow rate to a gas turbine engine during the initial stages of startup is provided. The fuel control system has a novel, closed control loop that measures the actual fuel flow rate to the primary nozzles of the engine, and uses this measurement to trim the commanded fuel flow rate signal generated by preprogrammed schedules in the engine's electronic control unit. By the novel arrangement of proportional and integral controllers, the fuel control system maintains a forward path gain of unity while permitting the independent adjustment of the gain of the controllers to achieve the system stability and response necessary for quick correction of fuel flow rate errors.
摘要:
The weight of a start cartridge in a cruise missile (10) of the type having a booster rocket (60) for initiating flight and a thrust producing gas turbine (12) for sustaining flight may be eliminated by placing the gas outlet (62) for the rocket engine (60) in ducting (64, 82) downstream of the gas turbine engine exhaust (20) so that operation of the rocket (60) to initiate flight of the missile (10), through eduction, draws sufficient air through the engine (12) to accelerate the same to starting speed.
摘要:
In order to rapidly start turbine engines in a manner eliminating resort to complex mechanical components, an auxiliary impingement assembly is disclosed. The turbine engine will typically have a turbine rotor with impeller blades integral therewith. It will also include a combustor for producing hot gases of combustion and communicating with the turbine rotor through a turbine nozzle. The turbine engine will normally be driven by the hot gases of combustion produced by the combustor. With this arrangement, the auxiliary impingement assembly will include a self-contained independent source of hot gases which may be directed at the impeller blades to assist the combustor in starting the turbine engine.
摘要:
A process and a device for starting a gas turbine such as a jet engine which contains a compressor, a turbine and a combustion chamber by means of hot exhaust gases from an exhaust gas source, wherein the energy of the exhaust gases is transferred at least partially to the gas turbine for the starting process. For this purpose the hot exhaust gases are used for simultaneously driving the turbine and for igniting the combustion in the combustion chamber. A single exhaust gas source can be used. In this manner, a large number of component parts are eliminated and the reliability of the starting process is considerably increased overall.