Abstract
This paper reports the results of an experimental study of the prototype rotary-piston air motor RPD-4,4/1,75 in the form of speed characteristics. The maxima of the air motor's performance effective indicators have been determined, as well as the rotation change ranges that correspond to them. It has been established that for the intake receiver's air pressure change range within 0.4...0.8 MPa the maximum value of effective power is 1.7...2.5 kW. In this case, the maximum value of the torque and mean effective pressure for a given pressure range in the intake receiver is 17.0...18.2 N∙m and 0.13...0.18 MPa, respectively. The dependence has been derived of the hourly air consumption on the rotations and pressure in the intake receiver. Depending on the test mode, the hourly air consumption is within 25…226 kg/hour. It has been established that the minimum values of the specific effective air consumption correspond to 800...1,000 rpm. Thus, for a maximum value of air pressure in the intake receiver of 0.8 MPa, the specific effective consumption is 60.8...93.2 kg/(kW∙h), for the minimum value of 0.4 MPa – 49.7...81.3 kg/(kW∙h). The potential of the adiabatic expansion capacity has been determined, brought to the air motor, as well as the effective adiabatic efficiency. The maximum efficiency of the air motor corresponds to 800...1,000 rpm. In this case, the maximum efficiency value was achieved at a pressure in the intake receiver of 0.4 MPa; it is 0.41. The dependences have been derived of the change in the pressure of spent air in the exhaust receiver, the maximum value of which does not exceed 0.075 MPa
Highlights
Air motors of the different principles of action and design are widely used in different industries, transport, underwater technical means, for the drive of manual tools [1,2,3,4,5]
We have experimentally studied the specificity of the workflow organization, changes in the basic operational parameters, as well as effective indicators, for different operational modes of the rotary-piston air motor RPD-4,4/1,75
The maximum values of the torque and mean effective pressure are in the range of air motor rotations 1,000...1,200 rpm, the effective power – 1,200...1,400 rpm
Summary
Air motors of the different principles of action and design are widely used in different industries, transport, underwater technical means, for the drive of manual tools [1,2,3,4,5]. The formation of pollution zones is associated with an ever-growing number of vehicles, their increased average service life, their decreased technical condition, while the limited roadway leads to a decrease in the speed of traffic and the formation of traffic jams Under such operating conditions, internal combustion engines (ICE) that are used in vehicles’ PP have low efficiency and high indicators of emission toxicity with flue gases. The most significant drawback is considered to be a relatively small mileage of the vehicle until the charging of the consumable cylinders This issue can be solved by increasing the reserve of compressed air (which can only be achieved to certain limits) and improving the efficiency of energy conversion in the air motor. There are two ways to improve power efficiency: via technical improvements to existing air motors or through the construction of new ones
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