A consortium of Russian companies and scientific agencies is preparing to start flight tests with a Yak-40 airliner converted to a hybrid-electric propulsion system. (Photo: N.E. Zhukovsky Scientific Research Center)
A 1970s
vintage Yak-40 regional jetliner serves as the platform for what could
become the Russian aerospace industry’s biggest step yet towards
hybrid-electric propulsion. Developers are now preparing the testbed aircraft
for an imminent first flight at the Siberian Scientific Research Academy
(SibNIA) and plan to exhibit it to the public for the first time at Moscow’s
MAKS 2021 air show in July.
The project,
which enjoys high-level backing from the Russian government, is mainly being
led by electric motor pioneer SuperOx and the Ufa State Aviation Technology
University, which is providing a generator to power the motors and recharge a
lithium-ion battery. The partners have removed the original three
Ivchenko-Progress AI-25 turbofans, replacing them with a pair of Honeywell’s
TFE731-5BR engines and a Klimov TV2-117 turboshaft, which drives the
generator.
Weighing
around 100 kg (220 pounds), the generator produces between 400 and 500 kW (up
to around 680 hp) of power per tonne, running at 2,500 rpm. The combined
electrical power output totals about 800 volts, which the partners say is the
highest achieved yet by Russian propulsion companies.
SuperOx’s
battery primarily gives the Yak-40 a boost during takeoff. During cruise
flight, it accumulates surplus energy while powering the company’s new electric
motor, which drives a six-blade propeller at the front of the aircraft.
Under a
project called “Contour,” underway since December 2016 and sponsored by
Russia’s Fund for Perspective Research, SuperOx seeks to develop a completely
integrated propulsion system that could be used to convert existing aircraft,
or potentially for new designs. At a media event on February 5 in Novosibirsk, FPI
head Andrei Grigoriev said that the government is fully committed to supporting
the development of a new all-electric aircraft.
Moscow-based
SuperOx is a specialist in applications for high-temperature superconductivity
technology, which is also being used for industrial power supply and other
transportation uses such as trains. SuperOx also partnered with the Central
Institute for Aviation Motors (TsIAM) based in Baranov, which also is
contributing to another project—called simply “Electric Aircraft”—that has
support from Russia’s Ministry for Industry and Trade. The N.E. Zhukovsky
Scientific Research Center also contributes to the Electric
Aircraft project.
According to
Anton Vavilov, who leads TsIAM’s hybrid-electric division, the Yak-40 flight
tests will boost the Russian industry’s efforts to transition aviation away
from propulsion based entirely on fossil fuel.
SuperOx
chairman Andrei Vavilov said that his company and TsIAM have already done
extensive development work to test wiring arrangements on a dozen or so
different experimental engines. He said the configuration resulting from the
work is now ready to be evaluated in flight. The aircraft also features some
cryogenic technology used for cooling the propulsion system.
Even though
the Yak-40 airframe is outdated, it has already proved useful as a testbed for
the re-engined Yak-40MS model, featuring the TFE7321 turbofans. It has also
served as a platform for the development of a new version of the trijet
with a high-lift composite wing (the STR-40DT).
The partners
expect to complete flight trials by the end of 2022. If they prove successful,
SuperOx says it will produce a higher-powered electric motor with an output of
around 1 MW per tonne (around 1,360 hp). It plans to fit two of the
motors onto an Ilyushin Il-114 aircraft, replacing its TV7-117 turboprops.
The
converted 68-seat model will be all-electric and act as a potential prototype
for Russia’s next-generation regional airliners. SuperOx has yet to specify how
its system will generate enough power to support such a large aircraft.
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