Thermal oil pocket mixing model
| Symbol | - |
|---|---|
| Unit | - |
| Attribute-ID | thermal_oil_mixing_model |
| Numeric ID | 9331 |
| Value Type | PMString |
The thermal pocket mixing model is used to determine the effective feed temperature TT,i of the fed lubricant QT,i.
The three-dimensional lubricant quantities supplied or discharged in the segment gaps or hydrostatic pockets are adjusted according to the two-dimensional volume flow balance.
| QT,i | Amount of lubricant supplied or discharged |
| QTs,1 | Flow over front bearing edge |
| QTs,2 | Flow over rear bearing edge |
| QE,i-1 | Flow from segment i-1 |
| QA,i | Flow to segment i |
The fresh oil of a pocket is mixed with the lubricant entering from the previous segment in a flow conduit and fed to the following segment. The flow conduit is the control area in which the relevant processes take place and is represented by the computational grid. For the numerical calculation, the volume flow profile at the leading edge of the segment is projected over the pocket area in the circumferential direction. The difference between the volume flow at the leading and trailing edges the segment corresponds exactly to the lubricant quantity supplied or discharged.
The following thermal oil pocket mixing models are available:
The effective supply temperature TT,i of the lubricant flowing into the conduit deviates from the nominal supply temperature T0 due to heat transfer to the reservoir. The effective lubricant supply temperature can be calculated from the thermal balance in the feeding area.
The heat transfer to the lubricant present in the pocket/segment gap area is neglected and the idealized boundary condition assumption is made that the effective feed temperature TT,i with positive oil flow in the respective pocket or segment gap is equal to the nominal feed temperature T0.