ALGORITHM FOR SELECTING A PUMP AND A DIESEL INTERNAL COMBUSTION ENGINE WHEN ASSEMBLING A PUMPING UNIT FOR RECLAMATION PURPOSES

Abstract

Purpose: to develop an algorithm for arranging a pumping unit for irrigation purposes taking into account the energy-saving operating mode of a diesel internal combustion engine and with the ability to adjust head and rate specifications in a wide, acceptable range. Materials and methods. The studies were conducted using a simulated scheme that includes a mobile pumping unit that withdraw irrigation water from a canal and transfers it via a pipeline to two center pivot sprinklers operating alternately. Generally accepted formulas to calculate power, torque, and flow were used. The proportionality law, selection method, and graphoanalytical method were applied. Results. The proposed algorithm has the following stages: source data capture – preliminary selection of a pump and an internal combustion engine – establishment of the pump speed control range – calculation of head, flow rate, power and torque on the pump shaft – digitization of the main characteristics of the internal combustion engine in a given crankshaft speed limit – comparison of pump and engine torques – comparison of pump and internal combustion engine capacities – analysis of graphic data on the torque and power of the pump and internal combustion engine – calculation of the energy characteristic of the water flow (Q·H) and construction of its dependence on RPM – clarification of the number of revolutions of the engine crankshaft to ensure the specified head-flow characteristics of the pump. In this case, the selection of the internal combustion engine was made taking into account its operation within the crankshaft speed limits providing the minimum specific fuel consumption. Conclusions. The developed algorithm allows selecting elements of a reclamation pumping unit taking into account the energy-saving operating mode of the internal combustion engine, as well as specifying the required pump shaft speed for the required performance.

Keywords

• algorithm
• pump
• internal combustion engine
• pumping unit
• control limit
• energy-saving mode