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Client: VertRotor UK
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VERT Rotors produces ultra-compact, light and low-vibration Rotary compressors from composites. They are designed for satellites, submarines and other applications where vibration and noise are not acceptable, and dimensions and weight are mission-critical.

This rotary compressor is a positive displacement machine with the pair of epicycloidal/hypocycloidal conical screws. The conical design of the rotors with the axial discharge has a large potential for efficient operation at variety of pressures due to prolonged internal compression. The first prototype showed a 1:22 compression ratio, and the company wanted to evaluate a new screw profile to simplify the manufacturing.

The numerical grid for this machine was generated by SCORG and used in CFD model where the flow parameters in the working chamber are calculated using transient boundary conditions.


The performance of this rotary compressor by use of SCORG could have been evaluated using multichamber thermodynamic model, full three dimensional CFD models or experimental measurements. 3D CFD was selected due to benefits of full flow visualization and relatively shorter model development cycle time.

Video: SCORG Grid for internal screw rotors

Results show a representative pressure indicator diagram of the machine obtained from the CFD model.

Video: Pressure Distribution on Rotor Surface

The full 3D CFD analysis of this compressor using SCORGTM allowed full insight into the process and operation which in turn helped the company to validate the new screw profile and quickly move to production in two weeks. Currently VERT Rotors Ltd. are manufacturing two types of this low vibration and low noise compressor for cooling and air applications.