A prospective turbojet engine with a high degree of double-circuit PD-14 for a prospective passenger aircraft MS-21 was tested by classical icing. According to a report by the Central Institute of Aviation Motors named after Baranov, who carried out inspections, the purpose of the tests was to evaluate the effectiveness of engine protection against icing and ingress of ice pieces. The examinations were recognized as successful; according to their results, specialists confirmed compliance with PD-14 requirements of Part 33 of the Russian Aviation Regulations (“Airworthiness Standards of Aircraft Engineers”).
In flight in cold ambient air at high humidity in the engine, ice crusts may form. They can influence the operation of the power plant, reducing the efficiency of fuel combustion, reducing power and worsening the compression of air at the inlet. In addition, if the pieces of ice from the fan are disrupted, they can enter the internal circuit of the power plant, damaging the compressor blades. Modern engines are designed in such a way that they can work reliably in icing conditions.
Part 33 of the Aviation Regulations, among other things, describes the requirements for anti-icing protection. In particular, the rules indicate that icing tests are considered to have been completed if the engine is stable in low-gas mode for at least 30 minutes at an air temperature of -9 to -1 degrees Celsius. The content of water droplets in the air should be at least 0.3 grams per cubic meter, and the average droplet diameter is at least 20 micrometers. After half an hour the engine must go into take-off power without any problems.
Classical icing, which was tested by the engine PD-14, called the formation of ice outgrowths in the engine in a high humidity. Such tests are carried out in a special installation equipped with a freezer and a system for mixing water spray into the air stream, which is fed to the engine. During the tests, specialists carefully monitor the parameters of the aircraft engine, and after them – inspect the power unit for any damage.
Earlier it was reported that in October of this year the enterprise “UDK-Perm Motors” will begin testing the serial turbofan engines PD-14. Serial power plant checks will begin after PD-14 completes certification tests, and developers will receive a type certificate for it. This should happen in the next few weeks. At the MC-21, the first PD-14 is planned to be installed before the end of the second quarter of next year.
Development of PD-14 has been ongoing since 2008. This is the first new aircraft engine of Russian design for the last 30 years. In addition to MS-21, more powerful versions of PD-14 can be installed on Tu-214 and IL-96 aircraft. A promising turbofan double-circuit twin-shaft engine will be able to develop traction up to 14 tons in take-off mode. At the present time, the third and final stage of the flight tests PD-14, which is necessary for successful certification, is being completed. The tests are conducted at the Gromov Flight Research Institute located near Moscow.