The Central Aerohydrodynamic Institute named after Professor N.E. Zhukovsky (TsAGI, part of the National Research Center "Institute named after N.E. Zhukovsky") has completed testing of a new emergency turbopump unit (TPU) for the MC-21 medium-range narrow-body aircraft.
The TPU for emergency power supply of the aircraft with electrical and hydraulic power from "OKB "Kristall" is part of the import substitution program for MC-21 onboard systems. It consists of an extension/retraction system drive, a three-phase AC generator, a hydraulic pump, and a rotor with a two-bladed variable pitch turbine.
To test the unit, OKB "Kristall" designed the necessary test equipment and tooling for the TsAGI wind tunnel.
The experiments included confirming the operability of the TPU in the entire operational range of speeds and altitudes of the aircraft. The issues of the time and safety of its release were studied, as well as the possibility of realizing maximum electrical and hydraulic power at all operational speeds, including minimum flight speeds. To meet the altitude conditions, the pumping and evacuation capabilities of the wind tunnel circuit were used. Thus, a flight altitude from 0 to 12 km was simulated.
As a result of the tests, specialists from JSC "OKB "Kristall" together with specialists from TsAGI confirmed "the design and technological solutions laid down at the stages of design and manufacture of the TPU, as well as the implementation of its design parameters".
It is noted that the experience gained during the experiment will be "taken into account when creating this type of installation for civil aircraft being developed in the Russian Federation".
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