Eaton Char-Lynn Motor , Combined Motor In The Future Motor

      The    Eaton Char-lynn Motor     will illustrate the variable-cycle turbofan motor. The ramjet motor: the working characteristics of the combined motor in the future motor.  The motor is housed in a ramjet motor with a turbojet motor. When taking off and flying at low speed, the turbojet motor inlet opens and works;  When the aircraft accelerates to a certain speed (for example, the Mach number is greater than 2), the turbojet motor intake is closed, and the entire turbojet motor is equivalent to the intake cone of the ramjet motor, and the airflow bypasses the turbojet motor casing and enters the combustion chamber of the ramjet motor. Perform supersonic combustion, start the ramjet and accelerate the aircraft to a higher speed;  When decelerating, the working procedure is reversed. The motor can achieve both hypersonic flight and cover most of the flight envelopes of existing jet motors. It is an ideal power plant for high-speed flight powered by an aspirating motor in the future.  In order to achieve higher flight speeds and altitudes, the aircraft will fly at the edge of the atmosphere and outer space (height 50-100 km).  Here, the air is extremely thin and the oxygen content is extremely low. It is very difficult to completely maintain the motor by inhaling oxygen in the outside air. It is necessary to adopt a combined power unit of the aspirating motor and the rocket motor. In addition to carrying fuel, the aircraft equipped with this power needs to carry some oxidant.  When the aircraft is flying in the atmosphere, it is powered by a ramjet motor, and fully uses the inhaled air to mix and burn with the fuel;  As the flight altitude increases, the oxygen content of the inhalation becomes less and less, and part of the oxidant will be replenished as needed, and the working mode of the motor is changed to the mixed working mode of the inhaled rocket motor;  As the flight altitude increases further, after flying out of the atmosphere, the motor’s operating mode will shift from aspiration to a full rocket motor mode of operation, powering the aircraft’s movement in outer space.  The fuel must use a high calorific value of liquid hydrogen fuel, which must be used to cool the high temperature body and hot end components while being supplied to the motor. The oxidant can be carried entirely by itself, or it can use the flight process in the atmosphere to absorb and store oxygen in the atmosphere for flight in outer space.  The motor can realize round-trip free flight inside and outside the atmosphere, and is one of the preferred power schemes for the world’s round-trip controlled flight.  Since the 1990s, in response to the power demand of hypersonic transport aircraft, the United States, Britain, France, Russia, Japan and other countries have studied various options, such as turbine ducted motors, external culvert fan motors, supersonic flow fans. motors, variable cycle motors and turbofan-stamped combined motors.  From 1989 to 1999, the Japanese government, three Japanese motor companies and four national laboratories, four famous motor companies from the United States and Europe participated in the investment of 300 million US dollars, and implemented the Supersonic and Hypersonic Propulsion System Research Program (HYPR). A major breakthrough was made.  On this basis, a new plan was initiated to develop a power unit for the next generation of Mach 5 hypersonic transport aircraft. It is a combined cycle motor (CCE) consisting of a variable cycle turbofan motor (VCE) and a methane-fueled ramjet motor (Fig. 11-11) with a static thrust of 27,551 kg at sea level.  The installation target is a 300-seat 4-speed hypersonic passenger aircraft with a maximum take-off weight of 440 tons, a cruising speed of Mach 5, a cruise altitude of 28.3 km, and a range of 12,000 km. It takes only 3 hours from Tokyo to New York, only 1/5 of the current flight time. about. When the aircraft is taking off and landing, the bypass ratio of VCE is increased to reduce noise;  When cruising at Mach 3 or below, the bypass ratio of VCE is reduced to minimize fuel consumption and has a large unit thrust; when the Mach number is 3 or more, the ramjet is replaced by VCE. This hypersonic passenger aircraft is expected to test flight around 2030.