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Fluid loading on moving enclosures
Ansys Workbench simulates the changing pressure conditions in a scroll compressor during operation.

Transient analysis of a scroll compressor with Ansys

Branch : Machinery and plant engineeringSpecialist field: Structural mechanics, Scalability of simulations

SANDEN, the leading manufacturer of automotive air conditioning systems, also produces scroll compressors. They consist of a stationary and an orbiting spiral, which are nested. During the movement of the orbiting spiral, the number, shape and volume of the internal chambers is constantly changing. With Ansys, this cycle can be better investigated.

Summary

Task

Automatic detection of the continuously changing chambers and their corresponding internal pressure using an analytical approach instead of the traditional FSI approach.

Solution

Easier and faster modeling of the pressure chambers, effortless simulation of the conditions for any given angle at full speed and short calculation times with Ansys HPC.

Customer benefits

Easier and faster modeling of the pressure chambers, effortless simulation of the conditions for any given angle at full speed and short calculation times with Ansys HPC.

Project Details

Task

The scroll compressor consists of a stationary and an orbiting spiral, which are nested. During the movement of the orbiting spiral, the number, shape and volume of the internal chambers is constantly changing. Consequently, the pressure conditions in the chambers are changing as well. The aim was to investigate the following aspects using FE simulation:

  • Automatic detection of the continuously changing chambers and their corresponding internal pressure using an analytical approach instead of the traditional FSI approach
  • Realistic compressor kinematics
  • Transient effect at an operating speed of 9000 RPM

Customer Benefit

Previously it was necessary to model the pressure generation chamber accurately in a CAD system for each rotation angle. The pressure must be “calculated by hand” and transferred manually – a tedious and error-prone process.

  • Using the automated chamber detection and pressure application, the customer can “effortlessly” run a simulation for any given angle.
  • An insight into the inner working forces of the critical components at high speed is possible.
  • The use of Ansys HPC reduces the overall elapsed transient simulation time.

Solution

Firstly, it was necessary to automatically detect the varying number of chambers, their shape and also their seclusion. An extended polygon-selection was also required to select the areas of pressure application. For this purpose, some APDL routines have been developed and integrated as Command Objects in Ansys Workbench. Joints that came from the multibody simulation and nonlinear contacts served to model the compressor’s complex kinematics realistically. With the help of Ansys HPC the time to calculate the transient analysis could further be reduced.


CAE Engineer

Products applied in the project