Hydromechanical: A combination of a flyweight governor and several sensors including compressor discharge pressure, burner can pressure, and exhaust pipe pressure. In some cases the engine’s fuel pump is integrated in to the fuel control.
How the turbine fuel system is managed by a hydromechanical fuel control?
The basic principle of turbine engine fuel metering is to vary the flow of fuel to the discharge nozzle by maintaining a constant pressure drop across a metering orifice whose area is varied by Pilot’s throttle position and by engine operating condition.
What are the two sections of a hydromechanical fuel control?
Fuel flow is controlled by a hydromechanical fuel control assembly, which contains a fuel shutoff section and a fuel metering section. This fuel control unit is sometimes mounted on the vane fuel pump assembly.
What is the purpose of the flyweight governor in the HMU?
All speed governing of the high-pressure spool (gas generator) is achieved by the flyweight governor. The flyweight governor modulates a pneumatic servo, consistent with the speed set point as determined by the power lever angle (PLA) setting.
What is a hydromechanical system?
Definition of hydromechanical
: relating to a branch of mechanics that deals with the equilibrium and motion of fluids and of solid bodies immersed in them.
What is hydromechanical equipment?
Hydromechanical equipment drives and controls the water flow before and after it passes through the generating unit. Some of the products include: Flexible or removable grills. Cofferdams.
What is a fuel air control unit?
The function of the fuel/air control assembly is to control engine air intake and to set the metered fuel pressure for proper fuel/air ratio.
How does a fuel metering unit work?
The FMU meters a precise amount of fuel fed into engine combustors, and dynamically alters the position of various valves to either increase or decrease the flow of fuel based on demand.
What controls fuel flow?
Boiler Control System
The fuel flow control supplies the fuels at the exact quantity to satisfy the demand of the fuel firing rate; it is closely coordinated with the air flow control system to ensure that the stoichiometric ratio is maintained with some excess air flow throughout the combustion process.
Where is the fuel flow transmitter located?
Where is the fuel flow transmitter located? It is mounted in the fuel line between the engine driven pump and the carburetor.
What is the function of EEC in aircraft?
The EEC is an electronic control, mounted on the engine or engine fan case, drawing power from an engine alternator to receive data from sensors measuring pilot commands and monitoring flight and engine conditions such as throttle position, fuel flow, temperature, vibration, and pressure.
What is aircraft FCU?
The Astronics Frequency Converter Unit (FCU) provides frequency conversion of variable frequency aircraft power. Recent trends in aircraft power systems use variable frequency (VF) generators instead of fixed frequency of 400Hz.
What is hydromechanical fuel control unit?
fuel control unit is a hydromechanical device which controls the high pressure pump output to the burners, to provide optimum fuel flow to the engine for all operating requirements.
How does a flyweight governor work?
When the crankshaft spins quickly, the flyweights open up, putting pressure on the governor cup and crank. This closes the throttle, limiting the air-fuel released into the engine. When the engine load increases, the crankshaft spins more slowly. This leads the flyweights to relax and the throttle to open back up.
What are two basic types of turbine engine fuel control units?
they automatically meter fuel to the engine. what are two basic types of turbine engine fuel control units? hydromechanical and electronic.
How does a fuel system work?
The fuel is stored in the fuel tank and the fuel pump draws fuel from the tank. It then travels through the fuel lines and is delivered it through a fuel filter to the fuel injectors (carburetors and throttle body injection were used on older vehicles).
What is a fuel control valve?
General description. The quantity control valve (also referred to as an inlet metering valve or flow regulator) is designed to control the quantity of diesel fuel flowing from the low pressure or lift pump to the pistons of the high pressure pump.
What is a hydro mechanical transmission?
Hydro-mechanical transmission architecture allows smaller hydraulic components to provide cost-effective CVT functionality to larger machines.
What equipment is used for hydroelectric power?
“A hydraulic turbine converts the energy of flowing water into mechanical energy. A hydroelectric generator converts this mechanical energy into electricity.
What does a water turbine do?
10.7. 1 Water Turbine. Water turbine is used to convert energy contained in water, potential energy or kinetic energy, into mechanical or electrical energy. There are two types of water turbine, the reaction water turbine and the impulse water turbine.
What is a fuel control module?
The Fuel Pump Driver Module controls the voltage delivered to a vehicle’s fuel pump. By controlling the voltage, the module maintains optimal fuel pressure and fuel delivery to the engine throughout its full operating range.
How does a fuel servo work?
Fuel servos use diaphragms to measure the air flow and adjust the fuel to air ratio accordingly. When the airflow increases, the airplane’s diaphragms move to allow a greater flow of fuel. When the airflow decreases, the flow of fuel is lessened.
How is fuel injected into a jet engine?
Direct Injection
With this system fuel is pressurized and injected directly into the combustion chamber bypassing the inlet valve, much like a diesel engine but with the two spark plugs.
How does a fuel control unit work?
The fuel control unit (FCU) uses a speed governor to adjust the shaft speed to the value demanded by the input of the power lever. For the calculation of the fuel flow the FCU follows the fuel demand function of the specific engine.
What is a hydro mechanical transmission?
Hydro-mechanical transmission architecture allows smaller hydraulic components to provide cost-effective CVT functionality to larger machines.
