Estimated 2-stroke scavenge-air pressure at a given load given turbocharger pressure ratio and ambient conditions - baseline for verifying cylinder fill and smoke-density performance.
Formula
$$ p_{scav} = p_{amb} \cdot \pi_c - \Delta p_{CAC} - p_{amb} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $p_{amb}$ | Ambient pressure | bar(a) | barometer |
| $\pi_c$ | T/C compressor pressure ratio | - | T/C performance curve |
| $\Delta p_{CAC}$ | Charge-air-cooler pressure drop | mbar | CAC gauges |
Sources
- MAN ES Project Guide - Scavenge air.