The PD-8 demonstrator engine was installed on an open-air test rig at the UEC-Saturn facility near Rybinsk. During testing, water was injected into the engine intake to simulate the effects of heavy rainfall on the powerplant during takeoff, climb, and landing. Company engineers confirmed the engine’s resilience to intense precipitation, which is considered one of the most demanding conditions for turbofan engines in this class, according to a UEC press release.
“The tests comprised three cycles covering a range of engine operating modes, from idle to takeoff thrust, including rapid acceleration and deceleration sequences. The test rig was equipped with a dedicated water injection system, consisting of four manifolds with multiple high-pressure nozzles. These nozzles spray water in carefully calibrated droplet sizes. Each test cycle introduced several tons of water into the engine,” the statement reads.
Heavy rainfall creates a moisture-saturated airflow in the engine intake and produces uneven distribution of air density and flow direction. This affects mass airflow and the angle of attack on the fan blades and compressor stages, shifting the engine operating point closer to the surge line and reducing its aerodynamic stability margin. Water ingestion tests are therefore conducted to demonstrate the engine’s ability to maintain stable operation under significant water exposure.
The Rybinsk test program complements recent SJ-100 aircraft trials conducted at Zhukovsky on a water-covered runway. Unlike the engine test rig, these trials evaluated the PD-8’s performance in conditions where substantial water is present on the runway, ensuring that water does not enter the intakes or cause thrust loss or engine malfunctions.
Test results confirm stable engine operation both on the rig and in flight under simulated heavy rain. These outcomes support the preparation of all required documentation for certification.
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