In the fourth quarter of 2019 to be heldthe second test launch of the Angara-A5 launch vehicle. It was created for launching from the Plesetsk and Vostochny cosmodromes, since the launch of the Proton is possible exclusively from Baikonur located in Kazakhstan. Testing "Angara-A5" has already been conducted in 2014, and only now it was discovered that its design is in danger of collapsing right at the time of launch due to the RD-191 engine oscillations. About the failure became known through the report of the NGO "Energomash".
The danger lies in the design of the rocket: its second stage is surrounded by four first-stage blocks. Because of this, there is a need to reduce the draft to 30%, whereas even with a 38% indicator, vibrations of about 4 Hz occur in its engine, which can destroy the structure. Also, fluctuations can also lead to breakage of control pressure pipelines — engine operation will be unpredictable.
The report shows one of the ways to eliminateProblems. In particular, the oscillation frequency can be changed using a special valve. Unfortunately, it does not always help - the efficiency directly depends on the engine instance, therefore the risk of structural failure still remains. It is noteworthy that the RD-191 was created on the basis of the power unit RD-170, which was the most important part of the Soviet super-heavy rocket "Energy".
Recall that the family "Angara" includes lungs,medium and heavy rockets. In 2023, the Vostochny Cosmodrome will start operating the launch complex for a light and heavy version of the missiles. Later, in 2026, it is planned to test the Angara-5V launch vehicle, the main feature of which is the presence of the hydrogen stage.
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