MAI engineer works on reducing noise and vibration in engines and pumps

24 March 2021

MAI engineer works on reducing noise and vibration in engines and pumps
Candidate of Technical Sciences Dmitry Klimenko, an engineer and associate professor of Department 202 "Rocket Engines" at the Moscow Aviation Institute, aims to refine liquid-propellant rocket engines with his development that will help increase their service life and decrease their noise emissions. This invention may also be used in the construction of domestic pumps.

Dmitry is working on a project to optimise the geometry of a centrifugal wheel with extra blades to reduce pressure pulsation, vibration and noise at blade repetition frequencies while delivering high power performance. His project received a Presidential grant for 2021-2022.

As the engineer explained, liquid rocket engines use pumps that pump liquid rocket fuel using rotating wheel blades. During operation, the fuel creates vortices at the edges of the blades. These act on the walls of the pump. Hence the vibration and noise.

"Vibration destroys the engine. Normally, liquid rocket engines burn up in the atmosphere as it is, but today the issue of reusing them has become relevant," says Dimitri. "This can be achieved by reducing vibration. The impellers are equipped with additional smaller blades. My team has developed a methodology that will help you find the optimum shape for a particular wheel."

The methodology being developed by the MAI researcher will help in the design process providing practical advice on how to select the optimum size and shape of the undercut blade (called splitter) of a double-deck wheel in the pump, as well as its position in relation to the main blades of the wheel. This will reduce noise at the vane frequency and increase the life of the pump.

The developments will be applicable to any pumping installation, including summer houses, residences and institutions.

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