DE2009808A1 - Jet pipe with continuous combustion - Google Patents

Description

Continuous Combustion Radiant Tube The invention relates to a jet pipe with an open circuit and continuous combustion as a jet engine for aircraft with a large speed range.

Such gas jet engines relate in contrast to rocket engines the combustion oxygen from the ambient air that enters the engine must be introduced and compacted.

It is known that the energy required for this is either directly supplied to the incoming Air masses taken (ramjet) or that a large part of the exhaust gas energy is used to drive a compressor via a gas turbine, the one Part of this energy supplies the sucked in air masses. The one is still known Exploiting the kinetic energy of the exhaust gases in conjunction with the resonance of a Air coil for the intermittent jet engines, as well as the air intake through the entry speed of the fuel or a fuel mixture (German Auslegeschr.

No. 1 209 809).

The ramjet engine has the disadvantage that it only works at high relative Air speed can generate thrust, it is therefore used as a propulsion system for cars un-ionized at low speeds.

The turbojet engines have because of the high losses in the area of turbine and compressor, especially at low speeds unfavorable efficiency. The high stress on moving parts means Wear and tear and vulnerability. The device for transferring exhaust gas energy to the sucked in air, occupies the largest part of the exhaust system, the so it is correspondingly high compared to the pure jet pipes.

As is well known, the intermittent radiant tubes allow the qeringe Exhaust gas speed, as well as their limited mass, no high thrust and no high speeds. Mechanical backflow throttles are very prone to failure.

The vibrations that occur put a strain on the engine and vehicle.

The invention is based on the object of a lightweight jet pipe to conceive that is able to without inflow velocity of the ambient air to suck it in, to supply it with energy, to condense it and a continuous one Zuzubrinqen combustion that generates the feed. The exhaust gas energy required for this should not first be converted into mechanical or other forms of energy, but the aerodynamic forces of the exhaust gases should be used directly for this task will. In addition, the engine is also intended for high, i.e. supersonic, speeds be suitable.

This task is achieved according to the invention in that the suction effect of the fast exhaust gases or a part of it - according to Bernoulli: g Pw 2 (Vaz - V) - is used to suck in ambient air and mix it with these exhaust gases. The high-energy gas mixture enriched with oxygen in this way is slowed down and thus condensed, so that it is now able, after suitable redirection, to the Combustion processes within the engine through oxygen supply and fuel gasification to maintain. The exhaust gases from these combustion processes are used to in order to generate partly the mentioned oxygen mixture and partly a propulsion impulse.

As the flow velocity of the ambient air increases, gradually to be dispensed with the Aufauqen through exhaust gases, and the engine is through simultaneous Change of the aerodynamic design gradually in a ramjet engine converted.

To make such a jet pipe in a simple manner, especially with regard to adapt the external shape to the requirements of an aircraft engine to be able to, are all essential according to a further embodiment of the invention Components assembled in an arrangement of concentric, partially conical tubes, which by counteracting displacement to the respective aerodynamic conditions have it adjusted. The combustion chamber, which the gas jet for suction and compression generated by the ambient air - referred to below as the supply combustion chamber - fulfilled only this task and does not generate any propulsion impulse.

The advantages achieved with the invention are in particular: that a light, uncomplicated jet engine for a large speed range is available.

The lack of a low speed range of the ramjet engine, as well as the missing high of the intermittent jet pipe are covered.

An embodiment of the invention is shown in the drawings A, B and C and is described in more detail below: Fig. A shows the engine when operating in the low speed range. In a supply combustion chamber (1) A fast gas jet is generated, which helps to reduce friction losses is slowed down in a 'diffuser (2). By narrowing the cross-section and redirecting it the exhaust gas jet is accelerated again and directed in the opposite direction <3). Due to the high exit speed, the suction ring opening (4) is used of the exhaust gases sucked in from the ring opening (5), in the straight part (6) accelerated and mixed with the exhaust gases. The energy content of the exhaust is evenly distributed over the resulting gas mixture; in addition, the transferred heat of the inner tube energy.

The oxygen-enriched -enerqi-rich gas mixture is well compressed in a diffuser (7) and partially the supply combustion chamber (1) and fed to a ring burning kernel (8) to maintain the combustion. The pipe jacket (9) allows the supply combustion chamber with the sum of static and dynamic To apply pressure. Deliver the accelerated gases in the annular combustion chamber (8) in the exemplary embodiment the propulsion pulse.

Fig. B shows the engine at approach velocities in the supersonic range. The supply combustion chamber (1) is made by extending the telescopic pipe jacket (9) completely or partially decommissioned. The inlet cone (10) becomes such moved that the ring opening (5) is completely or partially closed, as well as the air inlet geometry is adapted to the aerodynamic conditions of the respective supersonic flow. The engine works in connection with the annular combustion chamber (8) as a pitot tube.

Fig. C shows the engine during the starting process. The supply combustion chamber (1) is made by extending the telescopic pipe jacket (9) over a starting unit Fresh air (11) is supplied until the generated exhaust gas jet (12) is fast enough to independently supply the engine with ambient air.

Claims (3)

Claims jet pipe with continuous combustion that is capable of that Ambient air required to maintain the combustion in - all speed ranges to be sucked in automatically and fed to the combustion in a suitable form, marked by, that the suction effect of the rapid combustion exhaust gases or a part thereof does so is used to suck in ambient air that the further energy content of these exhaust gases by mixing them with the sucked-in air, it is partially transferred to them and that this gas mixture after compression in a diffuser wholly or partially the combustion is supplied for oxygen supply and fuel gasification. 2. jet pipe according to claim 1, characterized in that the suction and compressor part and the combustion chambers from an arrangement concentric partially conical tubes and an inlet cone are made by mutual displacement the engine to the respective operating state or the respective gas speed adjust. 3. jet pipe according to claim l and 2, characterized in that the Gas jet for supplying energy to the ambient air separately and not from one propulsion generating combustion chamber is generated.