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I. fuel metering sys
fuel metering systems 9
| Question | Answer |
|---|---|
| what are some of the sources used to heat the fuel in a turbine engine fuel system?(2) | bleed air and engine lubricating oil. |
| what are the most common types of fuel metering systems used on small reciprocating engine?(3) | float-type carburetors, pressure-injection carburetors and direct fuel injection systems. |
| what function does the mixture control perform? | controls the fuel-air mixture. |
| what generally cause spark plug fouling? | operating the engine with an excessively rich mixture at idle. |
| what is the purpose of an accelerating system? | it provides an immediate but brief increase in fuel flow in the venture to enrich the mixture. |
| what is a carburetor economizer system? | it is a power enrichment system that provides a richer mixture at high power settings, where the excess fuel aids in engine cooling. this system functions at throttle settings above cruise power settings. |
| when the mixture is placed in the idle-cutoff position, a slight rise in rpm is noted prior to the engine decelerating. what does the indicate? | the idle mixture is set correctly. |
| what maintains the fuel pressure in a pressure-injection carburetor? | an engine-driven fuel pump. |
| what happens if the manual mixture control of a pressure injection carburetor is moved to the idle cutoff position? | the engine stops. |
| how does an automatic mixture control function? | a sealed brass bellows connected to the fuel metering system, expands and contracts with changes in pressure and temperature, adjusting the mixture accordingly. |
| what are some of the advantages of fuel injection systems over carburetor systems?(5) | less danger of induction icing, better acceleration, better fuel distribution, better fuel economy, reduced overheating of individual cylinders. |
| what purpose do turbine engine fuel control units serve? | they automatically meter fuel to the engine. |
| what are two basic types of turbine engine fuel control units? | hydromechanical and electronic. |
| what are the engine variables detected by the fuel control unit?(6) | power lever position, engine rpm, compressor inlet temperature, compressor inlet pressure, compressor discharge pressure, burner pressure. |
| what are two major components of a supervisory electronics engine control? | the electronic control unit( computer) and the hydromechanical fuel control. |
| what are some of the advantages of a full- authority digital engine control over a hydromechanical fuel control?(6) | better fuel economy, improved starts, requires no engine trimming, provides engine limit protection, provides constant speeds regardless of atmospheric conditions or bleed air requirements, fully modulates the active clearance control, |
| what do turbine engine fuel spray nozzles do? | they inject fuel into the combustion area. |
| what are the different engine indications used for trimming a turbine engine? | either EPR or rpm is used depending on the particular engine. |
| what maintenance adjustments are normally allowed on an installed hydromechanical fuel control?(3) | specific gravity for fuel, idle rpm, and maximum rpm.( or maximum EPR. |
| why should engine rpm be accelerated periodically when making carburetor adjustments? | to clear the engine. |
Created by:
Justin84
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