Research of Rotary Piston Engine Use in Transport Power Plants

Abstract

A schematic diagram of a transport hybrid power plant using a new design RPE-4.4/1.75 rotary piston air engine is proposed. Its external speed characteristic is determined, according to which the maximum engine power is 8.75 kW at 850 rpm and the maximum torque is 127.54 N•m at 400 rpm. For various gears and speeds, all the components of the power balance were determined and the dynamic characteristic of the hybrid car was obtained when operated on an air engine. According to the dependences of the power balance, the total traction force from the rotary piston air engine on the driving wheels is 5 kN. The performance of acceleration of a hybrid car while working on an air engine is estimated, namely, the dependences of acceleration, time, and acceleration path are obtained. In urban traffic, the required time to accelerate the car to a speed of 60 km/h is 15.2 s and the path is 173 m. The possible drive range of the hybrid car on compressed air without additional recharging is analyzed. On one cylinder with compressed air with a volume of 100 liters, an initial pressure of 35 MPa, and a final pressure of 2 MPa, the hybrid car can travel about 26 km. O. Mytrofanov, A. Proskurin, A. PoznanskyiThe use of electric vehicles has a significant number of advantages and disadvantages. Thus, most of the disadvantages of electric cars are associated with batteries, namely, their significant cost, relatively low power reserve (especially at low ambient temperatures), a fairly long charging time, a small service life, and the cost of disposal. All these disadvantages are still compounded by an extremely undeveloped infrastructure of charging stations. Partially, these can be solved by using hybrid cars: for example, the problem of distance range or operation in winter.An alternative to electric and hybrid cars can be vehicles running on compressed air [10-13], or hybrid vehicles using an air engine instead of an electric one. Air engines, like electric engines, are environmentally friendly; in addition, the air engine power supply system has significant advantages compared to batteries, although it is somewhat more complicated. The advantages include the long service life of consumable cylinders, their quick refueling, and the fact that expensive and toxic disposal is not required. Thus, the frequency of inspection of cylinders for storing compressed air installed on mobile vehicles is 10 years (external and internal inspection and hydraulic tests with test pressure). The service life of supply cylinders with compressed air is set by the manufacturer. Usually, it is not limited, although in some countries, for example, in Russia, according to industrial safety requirements, it is limited to 20 years. Also, the advantages of using an air engine can be attributed to the fact that in summer, expanded and cooled air can be used in the car air conditioning system.The main element of a transport power plant is an air engine, where the technical and operational performance of the entire plant directly depends on its technical excell...

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