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PT6 Fuel Nozzles

Friday, April 27th, 2018

Fuel Nozzles ensure the performance of your PT6 engines. The 14 fuel nozzles spread the fuel evenly around the gas chamber for ignition in the combustion process.

Euravia PT6 Fuel Nozzles

Have you ever wondered why your PT6 engine is losing power or becoming less fuel efficient? Are you worried that the short hops you do in your aircraft could be damaging the hot section? Well here at Euravia Engineering we can help reduce these problems for you.

When a PT6C engine is in flight it sucks in approximately 6 sq. meters of air a second. This will include all airborne particles at the same time. The nature of these vary from area to area but the majority are saline particles and pollution from industry. As these are sucked in, they disrupt the air flow into the nozzle.

There are 14 fuel nozzles on the PT6 engines, spread around the casing, injecting into the engine. A smooth fuel flow into an engine is essential to prevent the above concerns; fuel nozzles, when fully operational will spray a cone of fuel into the chamber for atomisation and vaporisation for combustion in the engine. Over the course of mission hours, however, the injection of fuel deteriorates as the tip of fuel nozzle becomes clogged with carbon deposits. Every time the engine is used, these deposits from the reactions in the chamber are generated and work their way into the fuel nozzle tip. The OEM manual recommends these parts be removed and serviced at 300 and 600 hours. This allows these parts to be brought back up to full specification and compliant with guidelines.

If the fuel nozzles are not maintained the damage to the hot section parts, including the combustion liner and CT vane ring can be expensive when it comes to the hot section inspection.

Servicing and repair of these vital components is vital to ensuring an efficient and cost effective engine and must be carried out by an approved engineer. When this has been done, not only does the engine use less fuel (saving you money) but it increases the life span of the hot section parts of the engine and therefore reduces the cost when it comes to that inspection time.

The most common damage to the engine is that the vane ring sees stress damage as a result of poorly performing fuel nozzles. Once this damage has occurred the other hot section areas can subsequently deteriorate much quicker.

What Euravia do

Our highly trained engineers carry out the clean and function test on our custom built rig onsite at the UK plant in Lancashire. In a fully clean and functional fuel nozzle; a cone shape should be the displayed. However as they become clogged this can become an onion shape or the fuel simply drips from the tip. When testing in the rig, the engineer is looking for the flow rate and the angles of the cone.

At Euravia, we apply stringent criteria for the fuel nozzles flow pattern to ensure optimum fuel delivery to your engine and therefore reducing the operating costs.

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