The paper describes the construction and operation of the built-in volume capacity regulator for single-rotor screw compressor (SSC) with a circumferential cuto

Reliable and energy-efficient capacity control in high-pressure single-rotor screw compressors requires precise regulation of adjustable ring mechanisms operating under combined gas and thermal loading. Thermo-mechanical deformation, friction-induced torque demand, and stress concentration near discharge windows significantly influence structural integrity, clearance stability, and actuation performance. This study presents an integrated thermo-structural and analytical investigation of a regulating ring system with a hydraulic wedge-groove drive concept. Three groups of geometric variants (nine configurations total) were analyzed using coupled Steady-State Thermal and Static Structural finite element modeling in ANSYS 19.2. Thermal asymmetry between suction (22 °C) and discharge (120 °C) regions produced peak thermally induced deformation of 0.17–0.18 mm, consuming up to 60–70% of nominal operating clearance. Neglecting thermal effects underestimated peak thermally induced structural deformation of the regulating ring by 12–15%. Among the configurations, variant 2b provided the most balanced response, reducing peak equivalent stress by 12–15% and required actuation torque by 8–11%. An analytical model for friction torque and driving force was derived based on distributed contact pressure. The results reveal quadratic sensitivity of torque to contact radius and strong dependence on groove geometry. The proposed framework supports reliable clearance design and efficient actuation in heavy-duty rotating machinery.

The paper considers the mathematical model of the counterflow laminar motion of liquid and gas in an absorber with the ordered (layerwise) packing of packed bodies. Every bed of the packing is presented in the form of an equivalent (conditional) channel, the dimensions of which are defined by the specific surface and the portion of the free volume of packed bodies. An optimization problem is formulated that allows, at the initial stage of design, determining the main parameters of the absorber providing the design efficiency of CO2 absorption, taking into account the given design and technological conditions. It is offered to examine the hydrodynamic processes in the packed beds, having respect to the value of the flow velocity at the phase boundary