10.1.4 Conclusions
A new attitude control method based on jet reaction force is presented. The lateral
force is generated by eight circumferentially distributed nozzles. The main conclusions are as follows:
(1) The attitude control method of the aircraft is composed of eight parallel devices,
which distribute circumferentially on the missile body of the aircraft and provide the reaction force acting on the radial direction of the aircraft. When the
distribution of Laval nozzles deviates from the radial direction and two or more
Laval nozzles cooperate, the roll of the aircraft can be controlled.
(2) Eight nozzle jet reaction force control devices are connected in parallel on the
same high-pressure cylinder. Each nozzle can work intermittently according to
the need, and the solenoid valve controls the nozzle switch to obtain different
reaction force combinations, so as to realize the pitch, yaw, and roll attitude
control of the aircraft. Since the lateral force is directly controlled by solenoid
valves, the actual use of such systems is not limited by the flight altitude of
aircraft.
(3) The calculation method of resultant force when different nozzles are opened is
analyzed, and 64 possible lateral forces of attitude control are obtained. With
the same nozzle and gas source, the lateral force provided by each nozzle is the
same, which can be extended to nozzles with different parameters, and the
lateral force provided by each nozzle is different.
10.2 Laval Nozzle for Attitude Control of Aircraft
Aiming at the complex and difficult structure of conventional hydraulic steering
engine, electric steering engine, and gas steering engine of aircraft, the thermodynamic and dynamic model of Laval nozzle is established on the basis of a new
attitude control method using jet reaction force. The distributions of velocity field,
pressure field, and temperature field inside Laval nozzle are analyzed to provide
theoretical basis for nozzle structure design and process design. The results show
that the velocity of airflow in throat and initial expansion section changes rapidly,
and the gas scours seriously on the wall. Anti-scour protective materials and
technological treatment measures can be adopted in this part. The pressure on the
wall of the nozzle in the contraction section is high, and the pressure on the throat
and the wall of the initial expansion section varies sharply. The protective material
with higher strength can be used. During the process of airflow passing through
Laval nozzle, the temperature decreases continuously, but the wall temperature
changes little. The temperature at the nozzle throat decreases rapidly and changes
unevenly. It can be seen that the convergence section and throat of the nozzle pay
10.1 Aerodynamic Attitude Control Principle and Attitude …
175
A new attitude control method based on jet reaction force is presented. The lateral
force is generated by eight circumferentially distributed nozzles. The main conclusions are as follows:
(1) The attitude control method of the aircraft is composed of eight parallel devices,
which distribute circumferentially on the missile body of the aircraft and provide the reaction force acting on the radial direction of the aircraft. When the
distribution of Laval nozzles deviates from the radial direction and two or more
Laval nozzles cooperate, the roll of the aircraft can be controlled.
(2) Eight nozzle jet reaction force control devices are connected in parallel on the
same high-pressure cylinder. Each nozzle can work intermittently according to
the need, and the solenoid valve controls the nozzle switch to obtain different
reaction force combinations, so as to realize the pitch, yaw, and roll attitude
control of the aircraft. Since the lateral force is directly controlled by solenoid
valves, the actual use of such systems is not limited by the flight altitude of
aircraft.
(3) The calculation method of resultant force when different nozzles are opened is
analyzed, and 64 possible lateral forces of attitude control are obtained. With
the same nozzle and gas source, the lateral force provided by each nozzle is the
same, which can be extended to nozzles with different parameters, and the
lateral force provided by each nozzle is different.
10.2 Laval Nozzle for Attitude Control of Aircraft
Aiming at the complex and difficult structure of conventional hydraulic steering
engine, electric steering engine, and gas steering engine of aircraft, the thermodynamic and dynamic model of Laval nozzle is established on the basis of a new
attitude control method using jet reaction force. The distributions of velocity field,
pressure field, and temperature field inside Laval nozzle are analyzed to provide
theoretical basis for nozzle structure design and process design. The results show
that the velocity of airflow in throat and initial expansion section changes rapidly,
and the gas scours seriously on the wall. Anti-scour protective materials and
technological treatment measures can be adopted in this part. The pressure on the
wall of the nozzle in the contraction section is high, and the pressure on the throat
and the wall of the initial expansion section varies sharply. The protective material
with higher strength can be used. During the process of airflow passing through
Laval nozzle, the temperature decreases continuously, but the wall temperature
changes little. The temperature at the nozzle throat decreases rapidly and changes
unevenly. It can be seen that the convergence section and throat of the nozzle pay
10.1 Aerodynamic Attitude Control Principle and Attitude …
175