SJ-100 aircraft model tested on take-off and landing modes

Photo by © TsAGI Press Service

TsAGI has completed the next stage of testing of the SJ-100 aircraft model to study the aircraft behaviour during takeoff and landing.

The experiments took place in a low-speed continuous tube of closed type with two return channels and an open working part of ADT-101, where a screen was installed to simulate the influence of the ground surface on the aircraft movement. Specialists investigated the characteristics of unsteady flow in the wing trace in the landing configuration of the aircraft, with deflection of mechanisation elements, brake shields and interceptor sections in the presence of landing gear. The analysis of streamline features was carried out both by weight tests and by visualisation of the air flow.

As a result of the experiments, the Institute scientists obtained data on aerodynamic features of the SJ-100 model with PD-8 engines during takeoff and landing phases, including unsteady airflow characteristics in the wing trace. Based on these data, recommendations were made on the optimal angles of deflection of the brake flaps, which will reduce the intensity of vortices left by the wing when landing the aircraft.

SJ-100 airplane model tested for flutter

According to Nikolay Bragin, Head of the Aerodynamics Department of TsAGI, the reduction of vortices will make it possible to reduce the safe distance between aircraft landing at airports in the future, which will increase the capacity of the air hub. Also, this data can be used to complete the aerodynamic performance base of the SJ-100 aircraft on the landing mode.

Earlier, in December 2023, TsAGI completed tests of the SJ-100 aircraft model with PD-8 engines, the purpose of which was to clarify the aerodynamic characteristics and optimise the operation of the aircraft’s reversing device. The experiments were conducted under runway simulation conditions and varied in the speed range from 10 to 80 m/s, the operation of the reversing device under different wing mechanisation configurations was studied, and the aircraft’s run on the runway after landing was simulated.