Turbocharger - Surge Margin
Turbocharger surge margin - the distance between operating point and surge line on the compressor map.
Surge margin
22.2%
Status
Safe
Formula, assumptions, and limits
Design 20 % margin at 100 % MCR. Falls with load reduction. Below 10 % → audible surge, blade bending risk. Variable Turbine Geometry (VTG) enlarges surge margin at low load.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Air mass flow | kg/s | T/C performance curves |