What Is a Dish/Stirling System?

The Stirling engine (SE / AIP) system is roughly the same as the closed-cycle diesel engine system. The main difference is the engine. The SE / AIP system uses a hot air engine, while the CCD / AIP system uses a closed cycle diesel engine. The concept of a heat engine was first proposed by British scientist Robert Sterling in 1816. It is a heat engine that is heated by an external heat source and converts heat energy into mechanical energy. The cycle is a closed type, using a constant volume The regenerative gas cycle is referred to as the Stirling cycle. The specific working principle is that the upper chamber of the Stirling engine's piston is a hot chamber, which is connected to the lower chamber of the other piston. The four cylinders are connected to each other. The hot room above the No. 1 cylinder is connected to the cold room below the No. 2 cylinder, the hot room above the No. 2 cylinder is connected to the cold room below the No. 3 cylinder, and the hot room above the No. 3 cylinder is connected to the cold room below the No. 4 cylinder. Connected, the hot room on the upper part of the No. 4 cylinder is connected to the cold room on the lower part of the No. 1 cylinder at an angle of 90 ° from each other. They move the working gas back and forth between the hot and cold chambers, moving the piston and driving the crank. The Stirling engine mainly works in the underwater endurance state, connected in parallel with the battery, and supplies power to the propulsion motor, the whole boat auxiliary machinery and other electrical equipment.

Stirling engine system

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The Stirling engine (SE / AIP) system is roughly the same as the closed-cycle diesel engine system. The main difference is the engine. The SE / AIP system uses a hot air engine, while the CCD / AIP system uses a closed cycle diesel engine. The concept of a heat engine was first proposed by British scientist Robert Sterling in 1816. It is a heat engine that is heated by an external heat source and converts heat energy into mechanical energy. The cycle is a closed type, using a constant volume The regenerative gas cycle is referred to as the Stirling cycle. The specific working principle is that the upper chamber of the Stirling engine's piston is a hot chamber, which is connected to the lower chamber of the other piston. The four cylinders are connected to each other. The hot room above the No. 1 cylinder is connected to the cold room below the No. 2 cylinder, the hot room above the No. 2 cylinder is connected to the cold room below the No. 3 cylinder, and the hot room above the No. 3 cylinder is connected to the cold room below the No. 4 cylinder. Connected, the hot room on the upper part of the No. 4 cylinder is connected to the cold room on the lower part of the No. 1 cylinder at an angle of 90 ° from each other. They move the working gas back and forth between the hot and cold chambers, moving the piston and driving the crank. The Stirling engine mainly works in the underwater endurance state, connected in parallel with the battery, and supplies power to the propulsion motor, the whole boat auxiliary machinery and other electrical equipment.

Chinese name

Stirling engine system

Nature

Motivation system

People

Sterling

Advantages

Less mechanical noise and vibration

The difficulty and focus of technology realization are mainly the underwater combustion system of the Stirling engine, because the oxidant used in this system is pure oxygen, the combustion method is gas recirculation, and the combustion is performed under high pressure above the pressure of the surrounding seawater. .

Main technical advantages of the Stirling engine system

Less mechanical noise and vibration. Because the Stirling engine is a piston reciprocating engine that continuously heats the internal gas working medium from the outside to perform work, there is no deflagration of the diesel engine during the combustion process, and the combustion process is stable, so the engine noise and vibration are small, but some The components of the Stirling engine still use reciprocating motion machinery, so when the submarine is equipped, a double-layer vibration isolation system is still required to reduce underwater noise. The exhaust gas is convenient to discharge. When the combustion pressure of the hot gas engine is 22 kg / cm2, the exhaust gas is discharged underwater without the huge water management system of the closed-cycle diesel engine system. It can be emitted autonomously within a depth of 200 meters, even if the depth is increased. Requires small compressor assistance. When the combustion pressure is less than 20 kg / cm2, the depth of autonomous emission of exhaust gas underwater must be reduced accordingly. The exhaust emission depth of this type of engine is related to the combustion pressure, which is also a difficult point for technical realization.

Disadvantages and shortcomings of the Stirling engine system

The power is low. Because of its inherent low power density, the Stirling engine determines that the power density of the entire AIP system is smaller than that of the CCD / AIP system. If you want to increase the power, you need to have several engines, but this affects the layout and use of the entire submarine, it is difficult to achieve power breakthrough; the fuel consumption is large, currently higher than ordinary diesel engines.

At present, the country that has made more achievements in the SE / AIP system is Sweden. The Swedish Cocumb company has started the development of Stirling engines since the late 1960s. At present, it has successfully developed a 71-kilowatt V4-275R Stirling engine. The "Tran" submarine made it the world's first conventional submarine equipped with a SE / AIP system, which also marked that the Stirling engine has entered the practical stage. In recent years, Japan has also introduced the construction technology of Stirling engines from Sweden to equip or modify the Maritime Self-Defense Force submarines.