Abstract
The article considers an alternative to traditional transport power plants - plants operating on compressed air. The main element of such plants is a pneumatic engine, the technical perfection of which determines the effective and operational performance of the entire plant. The most appropriate is the development and creation of a new reliable and efficient pneumatic engine that meets the specifications and satisfies all operating conditions on the vehicle. The RPD-4.4/1.75 rotary piston engine meets all the necessary requirements, namely: it has a small weight and dimensions; it is reversible; works effectively in a wide range of pressures at the engine inlet; provides normal operation at various ambient temperatures. A schematic diagram of an environmentally friendly transport power plant based on the RPD-4.4/1.75 rotary piston pneumatic engine with a maximum power of 6 kW has been developed. The external speed characteristics of the RPD-4.4/1.75 rotary piston pneumatic engine were obtained for a range of working air pressure values in the intake receiver of 1.2...2.0 MPa. According to the obtained characteristics, the maximum values of the torque of the pneumatic engine are achieved at 1100 rpm, while the maximum values of the effective power at 1400 rpm. The components of the power balance and the dynamic factor of the vehicle for all gears and speeds for a range of operating air pressure in the intake receiver of 1.2...2.0 MPa are determined. According to the obtained characteristics, the RPD-4.4/1.75 rotary piston pneumatic engine together with the transmission in the first gear provides the maximum traction force of 2.1...3.2 kN. The dependences of acceleration, time and way of vehicle acceleration to a maximum speed of 50 km/h are determined. So, depending on the air pressure in the intake receiver, the necessary acceleration time is from 20.1 to 30.5 s, and the acceleration path is from 200.2 to 309.3 m. To increase the operational and economic indicators of the transport power plant, it is proposed to regulate the working air pressure in the intake receiver of a rotary piston pneumatic engine.
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