During the development of the C919 passenger aircraft, the Aeronautical Industry Pneumatic Academy undertook a number of key aerodynamic experimental missions. The hydrostatic pressure test machine has ensured the completion of various performance indicators, and has successfully held up the Chinese dream of a large aircraft.

The Pneumatic Academy is an aerodynamics research and experiment organization for the aviation industry. It is primarily engaged in aviation aerodynamics planning, numerical simulation, wind tunnel experiment foundation and use skills discussion, and research and development of supporting equipment. It has a number of advanced and useful experimental skills and has undertaken various aviation, High and low speed wind tunnel experimental mission of spacecraft type. In the research and development of C919, the aerodynamic institute completed a series of aerodynamic selection experiments to confirm the planning form of the aircraft; in more than 6 years, the FL-8 low-speed wind tunnel and the FL-9 low-speed supercharged wind tunnel were completed more than 10 times. The experiment lasted for more than 200 days and provided a strong technical support for the successful first flight of the C919.

Everyone goes all out

On September 16, 2010, the low-speed hinge torque experiment of the C919 passenger aircraft held an experimental launch meeting, which marked the wind tunnel experiment of the C919 passenger aircraft undertaken by the aerospace institute, which blew the impact horn and opened a new journey for the development of C919 passenger aircraft.

The wind tunnel experiment mission of the C919 passenger aircraft is the heaviest burden that the aerodynamic institute has taken for many years, and it is also the most difficult hard bone. For example, the difficulty and challenge of testing the impact of high Reynolds number on the low-speed aerodynamic characteristics of C919 aircraft; Difficulty in planning and processing balances such as hinge moments; unconfirmed factors such as experimental data processing program calculations, which make the cycle extremely serious and the mission extremely burdensome; the project's high degree of attention and the pressure brought by a wide range of areas. In the face of difficulties, the overall test personnel of the aerodynamic institute carried the large aircraft business on their shoulders, and closely focused on the operating idea of “adhering to focusing on industry, encouraging the creation of value, and improving their skills and capabilities” to seize opportunities, take advantage of the situation, and be useful. The successful completion of the wind tunnel experiment of the C919 passenger aircraft.

On October 8, 2010, the low-speed hinge torque experiment was completed for the first time; on October 21, 2012, the first half-mold high Reynolds number wind tunnel experiment was completed in the FL-9 wind tunnel; on December 9, 2012, the first time was in FL-9 Wind tunnel completed wind tunnel experiments with full-mode high Reynolds number; August 17, 2013, wind tunnel experiments with improved stall characteristics of the aircraft were completed; February 5, 2015, the final phase one experiment before the first flight of the C919 aircraft was completed.

As the "advanced officer" of the R & D front of the C919 passenger aircraft, in the 200 days and nights, the overall test personnel of the aerodynamic institute decomposed their responsibilities step by step for the smooth implementation of the project, and each of them assumed arduous responsibilities. In the course of the experiment, the project leader took care of the overall situation and focused on the key points. The project team adopted a parallel processing method to systematically organize each link, effectively grasp the key paths in the experiment process, do a good job of handling the time in the process together, and scientifically arrange the experiment. Shifts are useful to identify detailed hazards and do hazard prevention and control to ensure the useful completion of various missions.

The success of the project is the result of the concerted efforts of each team member. The members of the project team include the backbone of scientific research, and young workers are also impacting on the type line. With the enthusiasm of self-employment, they have promoted the development of large aircrafts. A large number of professionals have been trained in actual combat. Energy. They practiced the core values of “pneumatically-oriented, pragmatic and enterprising, sincere cooperation, mutual prosperity and win-win” with the actual actions.

Pioneering and fruitful

C919 passenger aircraft wind tunnel test process, the success of frequent reports, and vigorously promoted the type development process, laying a solid foundation for the first flight of the C919 passenger aircraft. During the period, the aerospace institute continued to innovate and developed a number of new skills and methods, which promoted our national machine wind tunnel experimental skill level to reach world advanced levels.

TPS dynamic imitation experiment method was used. This experiment is the first TPS inlet and exhaust type experiment for the C919 aircraft ’s first TPS nacelle planning and processing, thrust calibration, and model wind tunnel experiments. The TPS dynamic simulation experiment was completed in China, reducing the type unit size. The skills of aircraft research and development are dangerous, laying the foundation for further development of full-mode TPS experiments and anti-thrust experiment skills discussions.

In balance planning, skills such as rudder surface device self-aligning bearings, stress relief grooves, and multi-point load calibration of the rudder surface are used. It has dealt with the cluttered and difficult torque test skills in a novel way, significantly improved the accuracy of the hinge test, and reached the domestic leading level of similar skills.

After measuring the hinge moment, normal force, and center of gravity of the flat tail, elevator, rudder, aileron, and spoiler of the C919 aircraft at low speed, it provides important raw data for professional preliminary planning such as stability and flight control system It also provides input for the main rudder surface dynamics modeling and flight control law planning.

The experimental Reynolds number was changed to obtain the effects of different Reynolds numbers on the aerodynamic characteristics of the low-speed configuration of the C919 aircraft. It provided the basis for the optimization planning of the lifting device and the low-speed aerodynamic data correction operation. , To provide evidence and propositions for verifying the optimization plan of the high-lift configuration.

Carry out low-speed experiments of the C919 aircraft to obtain the effects of different stall characteristics improvement measures on the moment and lift characteristics of the landing configuration of the C919 aircraft, and optimize the layout configuration of the C919 aircraft with aerodynamic characteristics.

The take-off of large aircraft has laid a solid foundation for the improvement of the level of our national aircraft wind tunnel experiments and the sustainable development of the aerodynamic institute, and has made an important contribution to the level of China's civil aircraft aerodynamics research reaching the world advanced level.