Published on Apr 02, 2024
The green engine is one of the most interesting discoveries of the new millennium. It has got some unique features that were used for the first time in the making of engines. This engine is a piston less one with features like sequential variable compression ratio, direct air intake, direct fuel injection, multi-fuel usage etc. The efficiency of this engine is high when compared to the contemporary engines and also the exhaust emissions are near zero.
The significance of the engine lies in the efficiency when the present world conditions of limited resources of energy are considered. Prototypes of the engine have been developed. Generators have been produced with the green engine.
The United Nations Energy Organization names all of them "elementary energies", as well as "conventional energies". Electricity is merely a "second energy" derived from these sources. At present, the energy consumed all over the world almost completely relies on the supply of the five main energy sources. The consumption of petroleum constitutes approximately 60 percent of energy used from all sources, so it is the major consumer of energy.
As earlier mentioned, the Green engine is a six phase, internal combustion engine with much higher expansion ratio. The term "phase" is used instead of "stroke" because stroke is actually associated to the movement of the piston. The traveling of the piston from bottom dead centre to the top dead centre or vice versa is termed a stroke. But, in this engine pistons are absent and hence, the term "phase" is used. The six phases are: intake, compression, mixing, combustion, power and exhaust.
The engine comprises a set of vanes, a pair of rotors which houses a number of small pot-like containers. It is here, in these small containers that compression, mixing, combustion are carried out. The engine also contains two air intake ports, and a pair of fuel injectors and spark plugs. The spark plugs are connected in such a system so as to deactivate them, when a fuel which does not need sparks for ignition is used. The rotor is made of high heat resistance and low expansion rate material such as ceramic. Whereas, the metal used is an alloy of steel, aluminium and chromium.
Even though the engine is of symmetric shape, the vanes traverse an unsymmetrical or uneven boundary. This shape cannot be compromised as this a result of the path taken by the intake and exhaust air. This uneven boundary is covered by the vanes in a very unique fashion. The vanes are made in such a way that it comprises of two parts: one going inside a hollow one. At the bottom of the hollow vane is a compressive spring. On top of this spring is mounted the other part of the vane. Now, let us come to the working of the engine.
The air arrives to the engine through the direct air intake port in the absence of an air inlet pipe, throttle and inlet valves on the air intake system. A duct is provided on the sides of the vane and rotor. The duct is so shaped that when the air moves through, strong swirls generate when it gets compressed in the chamber. The air pushes the vane blades which in turn impart a proportionate rotation in the small rotor which houses the chambers. The inlet air duct ends with a very narrow opening to the chamber.
The Green engine's prototypes have been recently developed, and also because of the unique design, limitations have not been determined to any extent. But even in the face of limitations if any, the Green engine is sure to serve the purpose to a large extent.
Compared to conventional piston engines, operated on four phases, the Green engine is an actual six phase internal combustion engine with much higher expansion ratio. Thus it has six independent or separate working processes: intake, compression, mixing, combustion, power and exhaust, resulting in the high air charge rate. Satisfactory air-fuel mixing, complete burning, high combustion efficiency and full expansion. The most important characteristic is the expansion ratio being much bigger than the compression ratio. Also, the other main features are the revolutionary innovations of the sequential variable compression ratio, constant volume combustion and self-adapting sealing system. Therefore, an engine having extremely high thermal efficiency, near-zero emissions, quietness, light and small, lower cost with capability of burning of various fuels has come into being.
Direct air intake means that there is no air inlet pipe, throttle and inlet valves on the air intake system. Air filter is directly connected to the intake port of the engine, and together with the less heating effect of air intake process, benefited from lower temperature of independent intake chamber, a highest volumetric efficiency which makes engine produce a high torque of output on all speed range is achieved . The pump loss which consumes the part of engine power is eliminated .Also fuel measuring facilities are built-in,and parts are saved.
As a tangential air duct in between combustion chamber and compression chamber, a very swirling which could lost until gas port is opened, can be formed while air is pumped into the combustion chamber. Consequently, the air-fuel mixing and the combustion process can have a satisfying working condition.
This greatly revolutionary innovation can provide the most suitable compression ratio for the engine whatever operation mode it works on with burning variety of fuels. Therefore, an excellent combustion performance is attained.
Direct fuel injection can provide higher output and torque, while at the same time it also enhances the response for acceleration.
Since the independent air-fuel mixing phase is having enough time for mixing air and fuel under strong swirling and hot situation, the engine is capable to burn any liquid or gas fuels without modifications. An ideal air-fuel mixture could delete CO emission. Also centrifugal effect coming from both strong swirling and rotation of the burner makes the air-fuel mixture more dense near the spark plug. It benefits to cold starting and managing lean-burning.
The shape of combustion chamber herein can be designed as global as possible. Thus, a lowest surface to is obtained, and the engine is having less heat losses and high combustion efficiency.
Due to the independent combustion phase, compared to the conventional engine whose performances lack of efficient combustion time, resulting in heavy CO emission and low fuel usage rate, the Green engine has a sufficient controllable combustion time to match any fuels.
The fuels can generate more energy while the combustion occurs on the constant volume. Also, the constant volume combustion technology can allow the engine to have a stable combustion when the lean burning is managed. Moreover, more water can be added in to make the much higher working pressure and drop down the combustion temperature, so power is added; heat losses and NOx emissions are decreased.
The green engine operates on multi-power pulses with a small volume of working chamber contrasted to the conventional engine dose on the single power pulse with a large working chamber. Obviously, a small volume of chamber only needs little space, resulting in compact structure and limited size. Also, a small amount of air-fuel mixtures being ignited on each power pulse can greatly cut down explosion noise.
Because the burner, which is made of high heat resistance and low expansion rate material, such as ceramic, operates without cooling, a relatively high working temperature can eliminate the quenching zone which is the main source of emission and can greatly reduce the heat losses in the combustion chamber.
High expansion ratio can make the burnt gases to release much more power. In other words, the waste gases while they run out of the engine are only bringing much less energy with them. Therefore, the engine’s thermal efficiency is greatly raised, and at the same time, the noise and temperature of the exhaust are tremendously dropped.
This is another revolutionary innovation applied in the Green engine: it can eliminate a number of seal plates or strips to achieve gapless seal and to provide most efficient and reliable sealing system with less friction.
As major moving parts, vanes which are counted in little mass and operated symmetrically, the performance of the engine is very smooth. Hence, vibrations are eliminated.
Use of modular design is the best way for engine mass production. Thus stacking of rotors easily extends range of available power.
There is only a few dozens of parts which can be easily manufactured in the engine structure when compared with modern piston engine which comprises of more than a thousand parts. It suggests that the cost will be very low. Also, due to the compact structure the package and the weight of the Green engine will be only 1/5 to 1/10 of the regular engine on the same output.
As obvious from the technical features which include effective innovations, the advantages of the Green engine over the contemporary piston engines are many.
As Green engine is very compact with multi-power pulses, the size and weight could be 1/5 to 1/10 of the conventional piston engines on same output. Its power to weight ratio could be more than 2 hp per pound without supercharge or turbo charge.
There are only some dozens of parts easy to be manufactured in the engine structure.
Because many great innovations are being employed in the engine design such as: direct air intake, sequential variable compression ratio, super mixing process, constant volume combustion, controllable combustion time, high working temperature of the burner, high expansion ratio and self adapting sealing system etc., the thermal efficiency of the engine could be potentially as high as 65 %, even more if water add-in technology is to be considered.
Due to six phases of working principle, super air fuel mixing process and constant volume combustion with controllable time, the Green engine becomes the only real multi-fuel engine on our planet; any liquid or gas fuels can be burnt well. Also it would be ideal to coal powder if special anti-wearing material is employed.
With perfect air-fuel mixture, complete combustion under lower peak temperature and free of quenching effect, the emission of CO, HC and NOx could be near zero, thereby, a catalytic converter could be not required at all.
Due to inherence of good dynamic and static balance the performance of the Green engine is as smooth as an electric motor.
Direct injection, little rotating inertia and deleted reciprocating motion can characterize the Green engine with operating at a very fast accelerating response.
Burst out under small amount of mixtures, free of vibrations, and high expansion ratio make the Green engine much quieter. It is really environment-friendly. Green engine vehicles could transport troops on the battlefield of the future, and could serve as a vital source of auxiliary power in combat. This is because these engines are quiet, flexible and operate at low temperature, making them ideal for use in “stealth” vehicles.
The Green engine’s prototypes have been recently developed, and also because of the unique design, limitations have not been determined to any extent. But even in the face of limitations if any, the Green engine is sure to serve the purpose to a large extent
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