Model of the air/oil heat exchanger with external valve unit designed by NPO Nauka
Valery Butymov, Mil.Press Today
The frosty air at the inlet of a conventional heat exchanger, where the flow always passes the matrix, can result in the oil temperature too low for the helicopter takeoff. This is why, in the Arctic, helicopters need long warm-up, a representative of NPO Nauka told Mil.Press Today at the company’s pavilion.
The new heat exchanger features the mechanical bypass valve in the cover. Depending on the flow temperature, it directs the oil either through the heat-exchanging matrix or, without cooling, directly through the valve unit, or separates the oil: one part flows to the matrix, another one goes directly. This helps to avoid oil temperature problems when changing of climate conditions of the helicopter operations.
The heat exchanger’s model has already passed vibration tests and was cut to check the manufacturing quality. After that, the heat exchanger tailored for JSC Kavov was shown at the exhibition.
The 3-day long helicopter-related industrial exhibition HeliRussia-2019 started in Moscow on May 16.
