Theoretical Prediction of Mixed Frictional Heat of Mechanical Seals Based on Shoulder-shoulder Contact Model of Asperities

Abstract

The influences of rotational speed, friction gap and roughness on the frictional heat are also investigated. The results show common mechanical seals in mixed lubrication mostly operate with second elastic-plastic contact. The frictional heat from asperity contact takes more proportion of total frictional heat when ω ≤ 2 800 r/min is presented, but the viscous part gradually rises as the rotational speed increases and eventually equals to the total. Also, with the increased friction gap, the asperity and viscous frictional heat both decrease, however the former decreases to zero when d ≥ 2.8σ while the latter changes little. As the roughness of seal end faces increases, the total frictional heat dramatically falls first and then tends to invariable, which indicates it is profitable for reducing mixed frictional heat to properly increase the roughness on seal end faces.

Thermal Characteristics of Dry Gas Seal in Startup Process Considering Microscale Effects

“…The material characteristic parameters and geometric dimension parameters of DGS are listed in Table 1 [29][30][31]. The startup process of DGS involves many theories, such as solid friction and gas lubrication.…”

Mechanics Analysis of Rough Surface Based on Shoulder-Shoulder Contact

“…Wang [35] established a loading-unloading contact analytical model between two cylindrical rough surfaces based on fractal theory and investigated the effect of parameters in the model on the loading-unloading contact performance. In addition, some scholars use the shoulder-shoulder contact model [36][37][38][39] rather than top-top contact model when studying the contact force, contact stiffness and friction heat of two surfaces. However, these models do not have explicit applications for shoulder-shoulder contact, and do not specifically study the fractal machined surface that conforms to the W-M function.…”