The launch of a rocket

Analysis:

First of all, when the launch vehicle with satellite stands on the launch pad, all preparations are completed and the final preparation stage is entered according to the "countdown procedure".

photocdn.sohu/***********/Img***********

With the launch command from the ground control center: "9, 8, 7, 6, 5, 4, 3, 2, 1, launch!" The first stage rocket engine ignited, and the launch vehicle began to rise from the launcher, and the speed was getting faster and faster. This is the beginning of accelerated flight.

The launch phase is from the launch of the launch vehicle from the ground to the delivery of the payload into the predetermined orbit, which is called the launch phase. The flight route at this stage is called launch orbit.

The launch trajectory of a launch vehicle is generally divided into three parts, namely, the accelerated flight segment. Inertial flight segment and final acceleration segment. The launch vehicle takes off vertically 10 second. After counting to 0 second, it begins to turn slowly according to the predetermined procedure.

After the engine continues to work for about 100 seconds, when the launch vehicle has risen to an altitude of about 70km and basically reached the required orbital speed and the direction close to the ground, the first-stage rocket engine is shut down and separated, and the second-stage rocket engine is ignited to continue to accelerate the flight.

At this time, it has been flying for 2-3 minutes, and the altitude has reached 150 km-200 km. It has basically flown out of the dense atmosphere, and the arrow fairing has been thrown away according to the predetermined procedure. Then, when the rocket reaches the predetermined speed and altitude, the second-stage rocket engine is shut down and separated, and the accelerated flight segment ends.

At this time, the launch vehicle has gained a lot of kinetic energy, and under the action of the earth's gravity, it began to enter the inertial flight section until it was tangent to the predetermined orbit of the satellite, and the three-stage rocket engine began to ignite and entered the final acceleration section.

When accelerating to the predetermined speed, the third stage rocket engine is turned off, and the satellite is ejected from the rocket carrier and enters the predetermined satellite orbit. At this point, the mission of the launch vehicle is completed.