Analytical study of the end-face friction loss in a synchronal rotary multiphase pump

Abstract

This study introduces a new type of end-face structure with polytetrafluoroethylene seals that improves the reliability of the synchronal rotary multiphase pump (SRMP). End-face models, including the relative motion and friction loss between the rotor and cylinder end faces, are established for both the original and the improved end-face structures. The end-face friction losses are analytically investigated based on the theoretical calculations. Due to the low relative velocity between the rotor and cylinder end faces, the end-face friction losses for both of the end-face structures are found to be insignificant compared to the total friction loss in the SRMP. The increased end-face friction loss caused by the polytetrafluoroethylene seals in the improved end-face structure is also negligible. Assessment of the friction losses of two end-face structures in high-speed and high-pressure applications shows that the improved end-face structure exhibits better performance than the original. The parametric analysis suggests that the wider but taller cylinder is helpful in reducing the end-face friction loss of SRMP.

A Review on Sliding Vane and Rolling Piston Compressors

“…Subsequently, an experimental evaluation [248] and comprehensive model was presented in a series of literature which focused on frictional losses [249], rotating discharge valve dynamics [250], and leakage characteristics [251]. Further improvements to the compressor model included a two-phase flow leakage model [252], oil-free leakage model [253], in-chamber heat transfer model [254], end-face friction [255,256], and rotational vibration [257].…”

Design optimization of a synchronal rotary multiphase pump

“…This section presents an overview of the SRMP model; more details can be found in the literature. [10][11][12][13]17…”

“…17 In this project, however, under the operating condition in optimization search, the gas mass fraction is small enough, and as a result the compression heat of gas phase can be easily absorbed by the liquid phase with a slight temperature increase of the two-phase mixture. Referring to the modeling and experimental analysis on the SRMP, 10 when the thermodynamic model was assumed to be in an adiabatic condition, the relative errors between the simulated and experimental results are acceptable. In this way, heat transfer between the working fluids and chamber walls was excluded to reduce the computational time of the optimization search.…”

“…The details of the experimental setup can be found in the reference. 10 The operating conditions and basic parameters of the SRMP are shown in Table 1. In the experiment, the steady state performance of the SRMP under different operating conditions was tested using N32 oil or a mixture of N32 oil and air as working fluids.…”

“…Yang et al 8 presented the structural design and working principle of the SRMP, and also analyzed the geometrical and dynamic characteristics of this type of pump. In the reference, 10 relative motion and friction of the end faces in the SRMP were theoretical analyzed. It was found that the friction loss at the end faces in the SRMP is largely reduced due to the small relative velocity between the rotor and cylinder.…”