The formula to calculate the Volumetric Efficiency (ηv) is:
\[ \eta_v = 1 + r + r \cdot rp^{\frac{1}{\gamma}} \]
Volumetric Efficiency is the ratio of the volume of air/charge drawn into the cylinder(s) during the suction stroke to the total displacement of all the cylinder(s) at the atmospheric pressure. Compression Ratio is the ratio between the volume of the cylinder and the combustion chamber. Pressure Ratio is the ratio of final to initial pressure. Gamma is the ratio of heat capacities at constant pressure and volume.
Let's assume the following values:
Using the formula:
\[ \eta_v = 1 + 1.75 + 1.75 \cdot 6^{\frac{1}{2.6}} \approx 6.23599685644165 \]
The Volumetric Efficiency is approximately 6.23599685644165.
| Compression Ratio | Pressure Ratio | Gamma | Volumetric Efficiency |
|---|---|---|---|
| 1 | 6 | 2.6 | 3.991998203680944 |
| 1.1 | 6 | 2.6 | 4.291198024049039 |
| 1.2 | 6 | 2.6 | 4.590397844417134 |
| 1.3 | 6 | 2.6 | 4.889597664785228 |
| 1.4 | 6 | 2.6 | 5.188797485153323 |
| 1.5 | 6 | 2.6 | 5.487997305521418 |
| 1.6 | 6 | 2.6 | 5.787197125889513 |
| 1.7 | 6 | 2.6 | 6.086396946257607 |
| 1.8 | 6 | 2.6 | 6.385596766625701 |
| 1.9 | 6 | 2.6 | 6.684796586993796 |